static t_int *mtx_perform(t_int *w){
t_mtx *x = (t_mtx *)(w[1]);
int nblock = (int)(w[2]);
t_float **in_vectors = x->x_in_vectors;
t_float **out_vectors = x->x_out_vectors;
t_int i;
for(i = 0; i < x->x_ch; i++){
t_float *in = in_vectors[i];
t_float *out = out_vectors[i];
t_int n = nblock;
while(n--)
*out++ = *in++;
}
return (w + 3);
}