Update of /cvsroot/pure-data/externals/iem/iemmatrix/src In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv6363
Added Files: mtx_distance2.c Log Message: calculate the euclidian distance (rather: square of - to minimize calculations) between 2 sets of n-dimensional vectors (described as i*n and j*n matrices)
--- NEW FILE: mtx_distance2.c --- /* * iemmatrix * * objects for manipulating simple matrices * mostly refering to matlab/octave matrix functions * * (c) IOhannes m zmölnig, forum::für::umläute * * IEM, Graz * * this code is published under the LGPL * */ #include "iemmatrix.h"
/* mtx_distance2: gets the euclidian distances (squared) between 2 sets of n-dimensional vectors */
/* -------------------------------------------------------------- */ /* matrix math */
/* mtx_distance2 */ static t_class *mtx_distance2_class;
static void mtx_distance2_matrix(t_mtx_binmtx *x, t_symbol *s, int argc, t_atom *argv) { int row=atom_getfloat(argv); int col=atom_getfloat(argv+1); int row2=0, col2=0; t_atom *m; t_atom *m1 = argv+2; t_atom *m2 = x->m2.atombuffer+2; int i, j;
if (argc<2){ post("mtx_distance2: crippled matrix"); return; } if ((col<1)||(row<1)) { post("mtx_distance2: invalid dimensions"); return; } if (col*row>argc-2){ post("sparse matrix not yet supported : use "mtx_check""); return; }
row2=x->m2.row; col2=x->m2.col;
if (!(col2*row2)) { /* 2nd matrix is NULL; take the 1st matrix instead (distance between it's own vectors) */ m2=argv+2; row2=row; col2=col; } else if (col!=col2){ post("mtx_distance2: matrix dimensions do not match"); return; }
adjustsize(&x->m, row, row2); m = x->m.atombuffer+2;
for(i=0; i<row; i++) for(j=0; j<row2; j++){ t_float f=0.f; int c1=col*i; int c2=col*j;
int n; for(n=0; n<col; n++){ t_float x=atom_getfloat(&m1[c1+n])-atom_getfloat(&m2[c2+n]); f+=x*x; } SETFLOAT(m,f); m++; }
outlet_anything(x->x_obj.ob_outlet, gensym("matrix"), row*row2+2, x->m.atombuffer); } static void *mtx_distance2_new(void) { t_mtx_binmtx *x = (t_mtx_binmtx *)pd_new(mtx_distance2_class); inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("matrix"), gensym("")); outlet_new(&x->x_obj, 0); x->m.col = x->m.row = x->m2.col = x->m2.row = 0; x->m.atombuffer = x->m2.atombuffer = 0; return(x); }
void mtx_distance2_setup(void) { mtx_distance2_class = class_new(gensym("mtx_distance2"), (t_newmethod)mtx_distance2_new, (t_method)mtx_binmtx_free, sizeof(t_mtx_binmtx), 0, A_NULL, 0); class_addmethod(mtx_distance2_class, (t_method)mtx_distance2_matrix, gensym("matrix"), A_GIMME, 0); class_addmethod(mtx_distance2_class, (t_method)mtx_bin_matrix2, gensym(""), A_GIMME, 0); class_addbang (mtx_distance2_class, mtx_binmtx_bang);
class_sethelpsymbol(mtx_distance2_class, gensym("iemmatrix/mtx_distasnce2")); }
void iemtx_distance2_setup(void) { mtx_distance2_setup(); }