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/*
* 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_pivot */
static t_class *mtx_pivot_class;
typedef struct _mtx_pivot
{
t_object x_obj;
t_matrix m; // the output matrix
t_matrix m_pre; // the pre -multiply matrix
t_matrix m_post; // the post-multiply matrix
t_outlet *pivo, *pre, *post;
} t_mtx_pivot;
static void mtx_pivot_matrix(t_mtx_pivot *x, t_symbol *s, int argc, t_atom *argv)
{
int row=atom_getfloat(argv);
int col=atom_getfloat(argv+1);
t_atom *m_pre, *m_post;
int i, j, k;
int min_rowcol = (row<col)?row:col;
t_matrixfloat *buffer, *buf;
int *i_pre, *i_post, *i_buf;
int pivot_row, pivot_col;
if (argc<2){ post("mtx_pivot: crippled matrix"); return; }
if ((col<1)||(row<1)) { post("mtx_pivot: invalid dimensions"); return; }
if (col*row>argc-2){ post("sparse matrix not yet supported : use \"mtx_check\""); return; }
adjustsize(&x->m, row, col);
adjustsize(&x->m_pre, row, row);
adjustsize(&x->m_post,col, col);
matrix_set(&x->m_pre, 0);
matrix_set(&x->m_post, 0);
buffer = matrix2float(argv);
i_pre = (int *)getbytes(sizeof(int)*row);
i_post = (int *)getbytes(sizeof(int)*col);
/* clear pre&post matrices */
i=row;
i_buf=i_pre;
while(i--)*i_buf++=row-i-1;
i=col;
i_buf=i_post;
while(i--)*i_buf++=col-i-1;
/* do the pivot thing */
for (k=0; k<min_rowcol-1; k++){
// 1. find max_element
t_matrixfloat max = 0;
pivot_row = pivot_col = k;
for(i=k; i<row; i++){
buf=buffer+col*i+k;
j=col-k;
while(j--){
t_matrixfloat f = fabsf(*buf++);
if (f>max) {
max=f;
pivot_row = i;
pivot_col = col-j-1;
}
}
}
// 2. move max el to [k,k]
// 2a swap rows
if (k-pivot_row) {
t_matrixfloat *oldrow=buffer+col*k;
t_matrixfloat *newrow=buffer+col*pivot_row;
i=col;
while(i--){
t_matrixfloat f=*oldrow;
*oldrow++=*newrow;
*newrow++=f;
}
i=i_pre[k];
i_pre[k]=i_pre[pivot_row];
i_pre[pivot_row]=i;
}
// 2b swap columns
if (k-pivot_col) {
t_matrixfloat *oldcol=buffer+k;
t_matrixfloat *newcol=buffer+pivot_col;
i=row;
while(i--){
t_matrixfloat f=*oldcol;
*oldcol=*newcol;
*newcol=f;
oldcol+=col;
newcol+=col;
}
i=i_post[k];
i_post[k]=i_post[pivot_col];
i_post[pivot_col]=i;
}
}
float2matrix(x->m.atombuffer, buffer);
i=col;
m_post = x->m_post.atombuffer+2;
while(i--){
SETFLOAT(m_post+i_post[i]*col+i, 1);
}
i=row;
m_pre = x->m_pre.atombuffer+2;
while(i--)SETFLOAT(m_pre+i_pre[i]+i*col, 1);
outlet_anything(x->post, gensym("matrix"), 2+col*col, x->m_post.atombuffer);
outlet_anything(x->pre, gensym("matrix"), 2+row*row, x->m_pre.atombuffer);
outlet_anything(x->pivo , gensym("matrix"), 2+row*col, x->m.atombuffer );
}
static void mtx_pivot_free(t_mtx_pivot *x)
{
matrix_free(&x->m);
matrix_free(&x->m_pre);
matrix_free(&x->m_post);
}
static void *mtx_pivot_new(void)
{
t_mtx_pivot *x = (t_mtx_pivot *)pd_new(mtx_pivot_class);
x->pivo = outlet_new(&x->x_obj, 0);
x->pre = outlet_new(&x->x_obj, 0);
x->post = outlet_new(&x->x_obj, 0);
x->m.atombuffer = x->m_pre.atombuffer = x->m_post.atombuffer = 0;
x->m.row = x->m.col = x->m_pre.row = x->m_pre.col = x->m_post.row = x->m_post.col = 0;
return(x);
}
void mtx_pivot_setup(void)
{
mtx_pivot_class = class_new(gensym("mtx_pivot"), (t_newmethod)mtx_pivot_new, (t_method)mtx_pivot_free,
sizeof(t_mtx_pivot), 0, 0, 0);
class_addmethod(mtx_pivot_class, (t_method)mtx_pivot_matrix, gensym("matrix"), A_GIMME, 0);
class_sethelpsymbol(mtx_pivot_class, gensym("iemmatrix/mtx_transpose"));
}
void iemtx_pivot_setup(void)
{
mtx_pivot_setup();
}
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