using MEX file and constants

2013 9 27
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Hello,
I need to use PI value inside the mex file. how should i do it? (because right now I'm getting an error): Error GMSK_viterbi.c: 66 undeclared identifier `PI'

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James Tursa
James Tursa 2013-9-27
编辑：James Tursa 2013-9-27

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One way:
#include <math.h>
Then use M_PI for the value in your code instead of PI, or you could add this line also:
#define PI M_PI
Another way:
#define PI 3.1415926535897932
One could also use compile option -D to get it defined.

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