how to run c program file in matlab

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SHOBA MOHAN
SHOBA MOHAN 2018-1-10
评论： SHOBA MOHAN 2018-1-11
Hi i wish to call function written in .c in matlab. I installed sdk. I tried with mex filename.c and got the following error
C:\Users\Deepa\Documents\MATLAB\treevalc.c(26) : warning C4101: 'cid' : unreferenced local variable
C:\Users\Deepa\Documents\MATLAB\treevalc.c(92) : error C2143: syntax error : missing ';' before 'type'
C:\Users\Deepa\Documents\MATLAB\treevalc.c(94) : error C2143: syntax error : missing ';' before 'type'
C:\Users\Deepa\Documents\MATLAB\treevalc.c(95) : error C2143: syntax error : missing ';' before 'type'
C:\Users\Deepa\Documents\MATLAB\treevalc.c(97) : error C2143: syntax error : missing ';' before 'type'
C:\Users\Deepa\Documents\MATLAB\treevalc.c(100) : error C2143: syntax error : missing ';' before 'type'
C:\Users\Deepa\Documents\MATLAB\treevalc.c(101) : error C2143: syntax error : missing ';' before 'type'
C:\Users\Deepa\Documents\MATLAB\treevalc.c(102) : error C2143: syntax error : missing ';' before 'type'
C:\Users\Deepa\Documents\MATLAB\treevalc.c(104) : error C2143: syntax error : missing ';' before 'type'
C:\Users\Deepa\Documents\MATLAB\treevalc.c(105) : error C2065: 'n' : undeclared identifier
C:\Users\Deepa\Documents\MATLAB\treevalc.c(105) : error C2065: 'n' : undeclared identifier
C:\Users\Deepa\Documents\MATLAB\treevalc.c(105) : error C2065: 'nsplits' : undeclared identifier
C:\Users\Deepa\Documents\MATLAB\treevalc.c(105) : error C2065: 'n' : undeclared identifier
C:\Users\Deepa\Documents\MATLAB\treevalc.c(106) : error C2065: 'n' : undeclared identifier
C:\Users\Deepa\Documents\MATLAB\treevalc.c(110) : error C2065: 'ncatsplit' : undeclared identifier
C:\Users\Deepa\Documents\MATLAB\treevalc.c(110) : error C2065: 'n' : undeclared identifier
C:\Users\Deepa\Documents\MATLAB\treevalc.c(110) : error C2109: subscript requires array or pointer type
C:\Users\Deepa\Documents\MATLAB\treevalc.c(111) : error C2065: 'catsplit' : undeclared identifier
C:\Users\Deepa\Documents\MATLAB\treevalc.c(111) : error C2065: 'n' : undeclared identifier
C:\Users\Deepa\Documents\MATLAB\treevalc.c(111) : error C2109: subscript requires array or pointer type
C:\Users\Deepa\Documents\MATLAB\treevalc.c(114) : error C2143: syntax error : missing ';' before 'type'
C:\Users\Deepa\Documents\MATLAB\treevalc.c(115) : error C2143: syntax error : missing ';' before 'type'
C:\Users\Deepa\Documents\MATLAB\treevalc.c(119) : error C2143: syntax error : missing ';' before 'type'
C:\Users\Deepa\Documents\MATLAB\treevalc.c(121) : error C2065: 'numdata' : undeclared identifier
C:\Users\Deepa\Documents\MATLAB\treevalc.c(122) : error C2143: syntax error : missing ';' before 'type'
C:\Users\Deepa\Documents\MATLAB\treevalc.c(125) : error C2143: syntax error : missing ';' before 'type'
C:\Users\Deepa\Documents\MATLAB\treevalc.c(126) : error C2065: 'n' : undeclared identifier
C:\Users\Deepa\Documents\MATLAB\treevalc.c(126) : error C2065: 'n' : undeclared identifier
C:\Users\Deepa\Documents\MATLAB\treevalc.c(126) : error C2065: 'numdata' : undeclared identifier
C:\Users\Deepa\Documents\MATLAB\treevalc.c(126) : error C2065: 'n' : undeclared identifier
C:\Users\Deepa\Documents\MATLAB\treevalc.c(127) : error C2065: 'var' : undeclared identifier
C:\Users\Deepa\Documents\MATLAB\treevalc.c(127) : warning C4047: 'function' : 'int *' differs in levels of indirection
from 'int'
I am able to call successfully .cpp file in matlab but getting error while using .c file. I am using windows 10 matlab r2014a.
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SHOBA MOHAN
SHOBA MOHAN 2018-1-10
Thanks for the answer. I tired with that and got invalid option. I am intended to use the c program function into matlab. For your reference i am attaching my .c file code. Please suggest the way forward
#include "mex.h"
#include <stdlib.h>
#include <stdio.h>
/**
* Return the decision tree node corresponding to the given value set
*
* var[n]: the attribute ids for node n
* cut[n]: the threshold value for node n
* left_child[n]: the node id of the left child of node n, 0 if node n is terminal
* right_child[n]: the node id of the right child of node n, 0 if node n is terminal
* ncatsplit[c]: the number of values resulting in a left branch
* catsplit[c]: the values that would result in a left branch
* attributes: the attribute (variable) values for each feature
**/
void
treevalc(int* var, double* cut, int* left_child, int* right_child,
int* ncatsplit, double** catsplit,
double* attributes,
int* node_id) {
int currnode = 0;
int nextnode;
int currvar;
double currval;
int cid, v;
int numvals;
double* vals;
/* printf("init nodes: %d %d \n", left_child[currnode], right_child[currnode]); */
/* until reached terminal node */
while ((left_child[currnode] != 0) && (right_child[currnode] != 0)) {
/*printf("currnode: %d\n", currnode);*/
nextnode = -1;
currvar = abs(var[currnode])-1;
currval = attributes[currvar];
/* decision based on thresholded float value */
if (var[currnode] > 0) {
/*printf("currvar: %d\n", currvar);*/
/* branch left */
if (currval < cut[currnode]) {
nextnode = left_child[currnode];
}
/* branch right */
else {
nextnode = right_child[currnode];
}
}
/* decision based on discrete value */
else {
numvals = ncatsplit[(int)cut[currnode]-1];
vals = catsplit[(int)cut[currnode]-1];
for (v = 0; v < numvals; v++) {
if (currval == vals[v]) {
nextnode = left_child[currnode];
break;
}
}
if (nextnode == -1) {
nextnode = right_child[currnode];
}
}
currnode = nextnode-1;
/* printf("curr node: %d \n", currnode);*/
}
*node_id = currnode+1;
}
/**
* plhs = {var, cut, left_child, right_child, catsplit(cell array), attributes(numatt, numdata)}
*
*/
void mexFunction(int nlhs, mxArray *plhs[],
int nrhs, const mxArray *prhs[])
{
if (nrhs != 6) {
printf("Error: wrong number of input arguments: %d.\n", nlhs);
printf("Syntax: node_ids = treevalc(var, cut, left_child, right_child, catsplit, attributes)\n");
}
int* var = (int*)mxGetData(prhs[0]);
/* int* var = (int*)mxGetPr(prhs[0]); */
double* cut = mxGetPr(prhs[1]);
int* left_child = (int*)mxGetData(prhs[2]);
/* int* left_child = (int*)mxGetPr(prhs[2]); */
int* right_child = (int*)mxGetData(prhs[3]);
/* int* right_child = (int*)mxGetPr(prhs[3]); */
/* get catsplit variables */
int nsplits = mxGetNumberOfElements(prhs[4]);
int* ncatsplit = malloc(sizeof(int) * nsplits);
double** catsplit = malloc(sizeof(double*) * nsplits);
int n = 0;
for (n = 0; n < nsplits; n++) {
mxArray* catsplit_cell_mx = mxGetCell(prhs[4], n);
if (catsplit_cell_mx == 0) {
printf("null cell");
}
ncatsplit[n] = mxGetNumberOfElements(catsplit_cell_mx);
catsplit[n] = (double*)mxGetPr(catsplit_cell_mx);
}
int numatt = mxGetM(prhs[5]);
int numdata = mxGetN(prhs[5]);
/* printf("num data = %d num att = %d\n", numdata, numatt);*/
double* all_attributes = mxGetPr(prhs[5]);
plhs[0] = mxCreateDoubleMatrix(numdata, 1, mxREAL);
double* node_ids = mxGetPr(plhs[0]);
int tmp_id;
for (n = 0; n < numdata; n++) {
treevalc(var, cut, left_child, right_child, ncatsplit, catsplit,
&all_attributes[numatt*n], &tmp_id);
node_ids[n] = (double)(tmp_id);
/* printf("final node id: %d\n", tmp_id); */
}
free(catsplit);
free(ncatsplit);
}
SHOBA MOHAN
SHOBA MOHAN 2018-1-10
@ Walter Please refer the attached file and provide your valuable input.

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回答（1 个）

Walter Roberson
Walter Roberson 2018-1-10
Near line 87 you have executable code before you declare some of your local variables. That is valid C++, and it is valid in later C releases, but it is not valid in the default compilation model of C89.
You will need to do one of the following:
  • move those lines to after the initialization; or
  • put a {} around that initialization and to the rest of the function, so that the initializations are the first thing within a block; or
  • add the -std=c99 compile option; or
  • if you are using the GUI to set up the compile, find the place in the GUI to mark that you want C99 or C11.
  1 个评论
SHOBA MOHAN
SHOBA MOHAN 2018-1-11
Thanks Walter. I tried with first two option got the following error
Undefined function 'treevalc' for input arguments of type 'cell'.
Which part shall i include -std=c99 compile option? I am not using GUI.

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