/*File Name: midwt.cLast Modification Date:	06/14/95	12:55:58Current Version: midwt.c	1.4File Creation Date: Wed Oct 12 08:44:43 1994Author: Markus Lang  <lang@jazz.rice.edu>Copyright: All software, documentation, and related files in this distribution           are Copyright (c) 1994  Rice UniversityPermission is granted for use and non-profit distribution providing that thisnotice be clearly maintained. The right to distribute any portion for profitor as part of any commercial product is specifically reserved for the author.Change History: Fixed code such that the result has the same dimension as the                 input for 1D problems. Also, added some standard error checking.		Jan Erik Odegard <odegard@ece.rice.edu> Wed Jun 14 1995*/#include <math.h>//#include <malloc.h>#include <stdio.h>#include "mex.h"#include "matrix.h"#define max(A,B) (A > B ? A : B)#define min(A,B) (A < B ? A : B)#define even(x)  ((x & 1) ? 0 : 1)#define isint(x) ((x - floor(x)) > 0.0 ? 0 : 1)void mexFunction(int nlhs,mxArray *plhs[],int nrhs,const mxArray *prhs[]){  double *x, *h,  *y, *Lf, *Lr;  int m, n, h_col, h_row, lh, L, i, po2, j;  double mtest, ntest;  /* check for correct # of input variables */  if (nrhs>3){    mexErrMsgTxt("There are at most 3 input parameters allowed!");    return;  }  if (nrhs<2){    mexErrMsgTxt("There are at least 2 input parameters required!");    return;  }  y = mxGetPr(prhs[0]);  n = mxGetN(prhs[0]);   m = mxGetM(prhs[0]);   h = mxGetPr(prhs[1]);  h_col = mxGetN(prhs[1]);   h_row = mxGetM(prhs[1]);   if (h_col>h_row)    lh = h_col;  else      lh = h_row;  if (nrhs == 3){    L = (int) *mxGetPr(prhs[2]);    if (L < 0)      mexErrMsgTxt("The number of levels, L, must be a non-negative integer");  }  else /* Estimate L */ {    i=n;j=0;    while (even(i)){      i=(i>>1);      j++;    }    L=m;i=0;    while (even(L)){      L=(L>>1);      i++;    }    if(min(m,n) == 1)      L = max(i,j);    else      L = min(i,j);    if (L==0){      mexErrMsgTxt("Maximum number of levels is zero; no decomposition can be performed!");      return;    }  }  /* Check the ROW dimension of input */  if(m > 1){    mtest = (double) m/pow(2.0, (double) L);    if (!isint(mtest))      mexErrMsgTxt("The matrix row dimension must be of size m*2^(L)");  }  /* Check the COLUMN dimension of input */  if(n > 1){    ntest = (double) n/pow(2.0, (double) L);    if (!isint(ntest))      mexErrMsgTxt("The matrix column dimension must be of size n*2^(L)");  }  plhs[0] = mxCreateDoubleMatrix(m,n,mxREAL);  x = mxGetPr(plhs[0]);  plhs[1] = mxCreateDoubleMatrix(1,1,mxREAL);  Lr = mxGetPr(plhs[1]);  *Lr = L;  MIDWT(x, m, n, h, lh, L, y);}