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#include <string.h> |
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#include "GofR.h" |
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|
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void map( double *x, double *y, double *z, |
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double boxX, double boxY, double boxZ ); |
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|
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// this algoritm assumes constant number of atoms between frames, and |
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// constant boxSize |
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|
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void GofR( char* out_prefix, char* atom1, char* atom2, |
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struct xyz_frame* frames, int nFrames, |
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int startFrame, int endFrame ){ |
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|
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int i,j,k; |
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|
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enum g_types { all_all, atom_all, atom_atom }; |
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enum g_types the_type; |
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char* allAtom; |
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|
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double pairDens; |
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double pairConstant; |
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|
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double nAtom1; |
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double nAtom2; |
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double nAtoms; |
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|
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double delR; |
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double boxVol; |
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double shortBox; |
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|
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double rxj, ryj, rzj; |
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double dx, dy, dz; |
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double distSqr; |
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double dist; |
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|
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double rLower, rUpper; |
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double nIdeal; |
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double volSlice; |
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|
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int bin; |
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int histogram[GofRBins]; |
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double the_GofR[GofRBins]; |
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double rValue[GofRBins]; |
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|
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char out_name[500]; |
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char tempString[100]; |
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FILE *out_file; |
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|
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|
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// figure out the type of GofR we are calculating |
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|
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if( !strcmp( atom1, "all" ) ){ |
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|
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if( !strcmp( atom2, "all" ) ) the_type = all_all; |
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else{ |
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the_type = atom_all; |
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allAtom = atom2; |
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} |
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} |
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else{ |
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|
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if( !strcmp( atom2, "all" ) ){ |
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the_type = atom_all; |
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allAtom = atom1; |
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} |
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else the_type = atom_atom; |
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} |
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|
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// find the box size and delR; |
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|
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shortBox = frames[0].boxX; |
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if( shortBox > frames[0].boxY ) shortBox = frames[0].boxY; |
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if( shortBox > frames[0].boxZ ) shortBox = frames[0].boxZ; |
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|
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delR = ( shortBox / 2.0 ) / GofRBins; |
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boxVol = frames[0].boxX * frames[0].boxY * frames[0].boxZ; |
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|
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// zero the histograms; |
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|
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for(i=0; i<GofRBins; i++ ){ |
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|
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rValue[i] = 0.0; |
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the_GofR[i] = 0.0; |
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histogram[i] = 0; |
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} |
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|
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switch( the_type ){ |
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|
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case atom_atom: |
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|
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// find the number of each type; |
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|
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nAtom1 = 0; |
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nAtom2 = 0; |
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for( i=0; i<frames[0].nAtoms; i++ ){ |
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|
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if( !strcmp( frames[0].names[i], atom1 ) ) nAtom1++; |
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if( !strcmp( frames[0].names[i], atom2 ) ) nAtom2++; |
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} |
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|
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if( !nAtom1 ){ |
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|
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fprintf( stderr, |
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"\n" |
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"GofR error, \"%s\" was not found in the trajectory.\n", |
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atom1 ); |
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exit(8); |
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} |
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|
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if( !nAtom2 ){ |
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|
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fprintf( stderr, |
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"\n" |
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"GofR error, \"%s\" was not found in the trajectory.\n", |
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atom2 ); |
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exit(8); |
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} |
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|
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// calculate some of the constants; |
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|
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if( !strcmp( atom1, atom2 ) ) pairDens = nAtom1 * (nAtom1 - 1) / boxVol; |
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else pairDens = nAtom1 * nAtom2 / boxVol; |
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|
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pairConstant = ( 4.0 * M_PI * pairDens ) / 3.0; |
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|
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// calculate the histogram |
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|
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for( i=startFrame; i<endFrame; i++){ |
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for( j=0; j<(frames[i].nAtoms-1); j++ ){ |
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|
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if( !strcmp( frames[0].names[j], atom1 ) ){ |
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|
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rxj = frames[i].r[j].x; |
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ryj = frames[i].r[j].y; |
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rzj = frames[i].r[j].z; |
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|
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for( k=j+1; k< frames[i].nAtoms; k++ ){ |
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|
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if( !strcmp( frames[0].names[k], atom2 ) ){ |
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|
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dx = rxj - frames[i].r[k].x; |
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dy = ryj - frames[i].r[k].y; |
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dz = rzj - frames[i].r[k].z; |
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|
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map( &dx, &dy, &dz, |
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frames[i].boxX, frames[i].boxY, frames[i].boxZ ); |
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|
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distSqr = (dx * dx) + (dy * dy) + (dz * dz); |
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dist = sqrt( distSqr ); |
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|
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// add to the appropriate bin |
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bin = (int)( dist / delR ); |
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if( bin < GofRBins ) histogram[bin] += 2; |
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} |
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} |
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} |
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|
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else if( !strcmp( frames[0].names[j], atom2 ) ){ |
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|
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rxj = frames[i].r[j].x; |
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ryj = frames[i].r[j].y; |
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rzj = frames[i].r[j].z; |
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|
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for( k=j+1; k< frames[i].nAtoms; k++ ){ |
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|
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if( !strcmp( frames[0].names[k], atom1 ) ){ |
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|
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dx = rxj - frames[i].r[k].x; |
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dy = ryj - frames[i].r[k].y; |
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dz = rzj - frames[i].r[k].z; |
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|
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map( &dx, &dy, &dz, |
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frames[i].boxX, frames[i].boxY, frames[i].boxZ ); |
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|
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distSqr = (dx * dx) + (dy * dy) + (dz * dz); |
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dist = sqrt( distSqr ); |
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|
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// add to the appropriate bin |
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bin = (int)( dist / delR ); |
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if( bin < GofRBins ) histogram[bin] += 2; |
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} |
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} |
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} |
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} |
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} |
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|
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// calculate the GofR |
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|
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for( i=0; i<GofRBins; i++ ){ |
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|
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rLower = i * delR; |
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rUpper = rLower + delR; |
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|
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volSlice = pow( rUpper, 3.0 ) - pow( rLower, 3.0 ); |
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nIdeal = volSlice * pairConstant; |
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|
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the_GofR[i] = histogram[i] / ( nFrames * nIdeal ); |
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rValue[i] = rLower + ( delR / 2.0 ); |
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} |
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|
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// make the out_name; |
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|
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strcpy( out_name, out_prefix ); |
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sprintf( tempString, "-%s-%s.GofR", atom1, atom2 ); |
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strcat( out_name, tempString ); |
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|
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out_file = fopen( out_name, "w" ); |
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if( out_file == NULL ){ |
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fprintf( stderr, |
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"\n" |
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"GofR error, unable to open \"%s\" for writing.\n", |
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out_name ); |
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exit(8); |
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} |
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break; |
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|
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case atom_all: |
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|
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// find the number of AllAtoms; |
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|
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nAtom1 = 0; |
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for( i=0; i<frames[0].nAtoms; i++ ){ |
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|
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if( !strcmp( frames[0].names[i], allAtom ) ) nAtom1++; |
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} |
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|
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if( !nAtom1 ){ |
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|
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fprintf( stderr, |
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"\n" |
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"GofR error, \"%s\" was not found in the trajectory.\n", |
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atom1 ); |
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exit(8); |
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} |
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|
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// calculate some of the constants; |
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|
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pairDens = frames[0].nAtoms * (nAtom1 - 1) / boxVol; |
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pairConstant = ( 4.0 * M_PI * pairDens ) / 3.0; |
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|
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// calculate the histogram |
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|
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for( i=startFrame; i<endFrame; i++){ |
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for( j=0; j<(frames[i].nAtoms-1); j++ ){ |
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|
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if( !strcmp( frames[0].names[j], allAtom ) ){ |
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|
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rxj = frames[i].r[j].x; |
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ryj = frames[i].r[j].y; |
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rzj = frames[i].r[j].z; |
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|
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for( k=j+1; k< frames[i].nAtoms; k++ ){ |
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|
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dx = rxj - frames[i].r[k].x; |
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dy = ryj - frames[i].r[k].y; |
260 |
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dz = rzj - frames[i].r[k].z; |
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|
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map( &dx, &dy, &dz, |
263 |
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frames[i].boxX, frames[i].boxY, frames[i].boxZ ); |
264 |
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|
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distSqr = (dx * dx) + (dy * dy) + (dz * dz); |
266 |
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dist = sqrt( distSqr ); |
267 |
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|
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// add to the appropriate bin |
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bin = (int)( dist / delR ); |
270 |
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if( bin < GofRBins ) histogram[bin] += 2; |
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} |
272 |
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} |
273 |
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|
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else{ |
275 |
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|
276 |
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rxj = frames[i].r[j].x; |
277 |
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ryj = frames[i].r[j].y; |
278 |
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rzj = frames[i].r[j].z; |
279 |
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|
280 |
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for( k=j+1; k< frames[i].nAtoms; k++ ){ |
281 |
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|
282 |
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if( !strcmp( frames[0].names[k], allAtom ) ){ |
283 |
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|
284 |
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dx = rxj - frames[i].r[k].x; |
285 |
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dy = ryj - frames[i].r[k].y; |
286 |
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dz = rzj - frames[i].r[k].z; |
287 |
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|
288 |
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map( &dx, &dy, &dz, |
289 |
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frames[i].boxX, frames[i].boxY, frames[i].boxZ ); |
290 |
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|
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distSqr = (dx * dx) + (dy * dy) + (dz * dz); |
292 |
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dist = sqrt( distSqr ); |
293 |
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|
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// add to the appropriate bin |
295 |
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bin = (int)( dist / delR ); |
296 |
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if( bin < GofRBins ) histogram[bin] += 2; |
297 |
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} |
298 |
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} |
299 |
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} |
300 |
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} |
301 |
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} |
302 |
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|
303 |
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// calculate the GofR |
304 |
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|
305 |
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for( i=0; i<GofRBins; i++ ){ |
306 |
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|
307 |
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rLower = i * delR; |
308 |
+ |
rUpper = rLower + delR; |
309 |
+ |
|
310 |
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volSlice = pow( rUpper, 3.0 ) - pow( rLower, 3.0 ); |
311 |
+ |
nIdeal = volSlice * pairConstant; |
312 |
+ |
|
313 |
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the_GofR[i] = histogram[i] / ( nFrames * nIdeal ); |
314 |
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rValue[i] = rLower + ( delR / 2.0 ); |
315 |
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} |
316 |
+ |
|
317 |
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// make the out_name; |
318 |
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|
319 |
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strcpy( out_name, out_prefix ); |
320 |
+ |
sprintf( tempString, "-%s-%s.GofR", allAtom, "all" ); |
321 |
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strcat( out_name, tempString ); |
322 |
+ |
|
323 |
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out_file = fopen( out_name, "w" ); |
324 |
+ |
if( out_file == NULL ){ |
325 |
+ |
fprintf( stderr, |
326 |
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"\n" |
327 |
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"GofR error, unable to open \"%s\" for writing.\n", |
328 |
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out_name ); |
329 |
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exit(8); |
330 |
+ |
} |
331 |
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break; |
332 |
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|
333 |
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case all_all: |
334 |
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|
335 |
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// calculate some of the constants; |
336 |
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|
337 |
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pairDens = frames[0].nAtoms * (frames[0].nAtoms - 1) / boxVol; |
338 |
+ |
pairConstant = ( 4.0 * M_PI * pairDens ) / 3.0; |
339 |
+ |
|
340 |
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// calculate the histogram |
341 |
+ |
|
342 |
+ |
for( i=startFrame; i<endFrame; i++){ |
343 |
+ |
for( j=0; j<(frames[i].nAtoms-1); j++ ){ |
344 |
+ |
|
345 |
+ |
rxj = frames[i].r[j].x; |
346 |
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ryj = frames[i].r[j].y; |
347 |
+ |
rzj = frames[i].r[j].z; |
348 |
+ |
|
349 |
+ |
for( k=j+1; k< frames[i].nAtoms; k++ ){ |
350 |
+ |
|
351 |
+ |
dx = rxj - frames[i].r[k].x; |
352 |
+ |
dy = ryj - frames[i].r[k].y; |
353 |
+ |
dz = rzj - frames[i].r[k].z; |
354 |
+ |
|
355 |
+ |
map( &dx, &dy, &dz, |
356 |
+ |
frames[i].boxX, frames[i].boxY, frames[i].boxZ ); |
357 |
+ |
|
358 |
+ |
distSqr = (dx * dx) + (dy * dy) + (dz * dz); |
359 |
+ |
dist = sqrt( distSqr ); |
360 |
+ |
|
361 |
+ |
// add to the appropriate bin |
362 |
+ |
bin = (int)( dist / delR ); |
363 |
+ |
if( bin < GofRBins ) histogram[bin] += 2; |
364 |
+ |
} |
365 |
+ |
} |
366 |
+ |
} |
367 |
+ |
|
368 |
+ |
// calculate the GofR |
369 |
+ |
|
370 |
+ |
for( i=0; i<GofRBins; i++ ){ |
371 |
+ |
|
372 |
+ |
rLower = i * delR; |
373 |
+ |
rUpper = rLower + delR; |
374 |
+ |
|
375 |
+ |
volSlice = pow( rUpper, 3.0 ) - pow( rLower, 3.0 ); |
376 |
+ |
nIdeal = volSlice * pairConstant; |
377 |
+ |
|
378 |
+ |
the_GofR[i] = histogram[i] / ( nFrames * nIdeal ); |
379 |
+ |
rValue[i] = rLower + ( delR / 2.0 ); |
380 |
+ |
} |
381 |
+ |
|
382 |
+ |
// make the out_name; |
383 |
+ |
|
384 |
+ |
strcpy( out_name, out_prefix ); |
385 |
+ |
sprintf( tempString, "-%s-%s.GofR", "all", "all" ); |
386 |
+ |
strcat( out_name, tempString ); |
387 |
+ |
|
388 |
+ |
out_file = fopen( out_name, "w" ); |
389 |
+ |
if( out_file == NULL ){ |
390 |
+ |
fprintf( stderr, |
391 |
+ |
"\n" |
392 |
+ |
"GofR error, unable to open \"%s\" for writing.\n", |
393 |
+ |
out_name ); |
394 |
+ |
exit(8); |
395 |
+ |
} |
396 |
+ |
break; |
397 |
+ |
} |
398 |
+ |
|
399 |
+ |
for( i=0; i<GofRBins; i++ ){ |
400 |
+ |
fprintf( out_file, |
401 |
+ |
"%lf\t%lf\n", |
402 |
+ |
rValue[i], the_GofR[i] ); |
403 |
+ |
} |
404 |
+ |
|
405 |
+ |
fclose( out_file ); |
406 |
+ |
} |
407 |
+ |
|