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# Counting the number of elements of a double **

Posted on 2004-10-20

Hi, in a called function I have counted and allocated the size for this double **, I have now passed it back to the original function. I need to know the number of elements in the y position, i.e. double[x][y], I have tried a few stabs at using sizeof and could only get the size of the pointers, now I am trying to traverse until I reach a NULL, but I am getting the compiler error of: invalid operands to binary !=

Here is a snippet of my traversing code:

input_index= 0;

int count_this= 0;

while (trajectory_data[0][input_index]!= NULL)

{

count_this++;

input_index++;

}

I am trying to count just the number of elements in trajectory_data[0]

Thanks for any advice and help, I am putting 500 on this one because it is URGENT.

M.