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Printing out the element values in a mxDouble array (C++ script in Matab)

Asked by Amanda Zong on 31 May 2019
Latest activity Edited by James Tursa
on 31 May 2019
Hi,
I am using Matlab 2017b and am having trouble printing out the values stored in a mxDouble array.
I have written a mexFunction in a C++ script that takes in a 2-d array as input. Using mxGetPr, I create a pointer of type double * to this array. Let's call this pointer "x."
I try to print out the first element of the array, using the following code:
mexPrintf("x value is%d\n",*x);
However, it appears that the integer printed is address of the value pointed to by x, not the value itself.
How do I print out the value pointed to instead of the address?
Thanks!

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1 Answer

Answer by James Tursa
on 31 May 2019
Edited by James Tursa
on 31 May 2019
 Accepted Answer

%d is a decimal integer format for use with short, int, long, etc. This doesn't work with floating point. Try e.g. %f or %g instead.

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