matlab/mex/signaldistmatrix.c

Go to the documentation of this file.

#include "mex.h"
#include "mex_utils.h"

#include <stdlib.h>
#include "array.h"
#include "distances.h"


void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[]){ 
  char msg[2000];
  const char *docstring = 
     "signaldistfunction Pointwise distance Matrix between two signals.\n"
     "[ distmat ] = signaldistfunction( signal1, signal2 );\n"
     " Calculate a euclidean distance matrix.\n\n"
     "[ distmat ] = signaldistfunction( signal1, signal2, metric, ... );\n"
     " Calculate a distance matrix with another metric.\n"
     " Valid values for metric are:\n"
     " 'euclidean', ...\n"
     " You can pass additional parameters for the distance function along.\n";
  
  /* check proper input and output */
  if(nrhs<2){
    sprintf(msg, ">> Need at least 2 inputs.\n%s\n", docstring);
    mexErrMsgTxt(msg);
  } else if(!mxIsDouble(prhs[0]) || !mxIsDouble(prhs[1])){
    sprintf(msg, ">> First and second Input must be double arrays.\n%s\n", docstring);
    mexErrMsgTxt(msg);
  } 

  /* getting the appropriate array representation */
  Array *s1 = mex_mxarray_to_array( prhs[0] );
  Array *s2 = mex_mxarray_to_array( prhs[1] );

  /* computation */
  Array *d=distmatrix_signaldist( vectordist_euclidean, s1, s2, NULL, NULL );
  plhs[0]=mex_array_to_mxarray( d ); 

  /* cleaning up */
  array_free( s1 );
  array_free( s2 );
  array_free( d );

  return;
}