how to run c program file in matlab

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SHOBA MOHAN
SHOBA MOHAN on 10 Jan 2018
Commented: SHOBA MOHAN on 11 Jan 2018
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.
  4 Comments
SHOBA MOHAN
SHOBA MOHAN on 10 Jan 2018
@ Walter Please refer the attached file and provide your valuable input.

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Answers (1)

Walter Roberson
Walter Roberson on 10 Jan 2018
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 Comment
SHOBA MOHAN
SHOBA MOHAN on 11 Jan 2018
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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