Could not allocate memory

Question

In my C code I am allocating memory for 2d array double E[2000][2000]; but when I run it gets a runtime error Segmentation fault(core dumped) and when

Answer 1

I assume you are allocating it on the stack by simply

double E[2000][2000];

which will probably be more than stack size allocated to your program.

Try using malloc (or new in c++) or increase the default stack size of your program using options. gcc can be configured using setrlimit() for this purpose.

setting stack size in gcc

Keep in mind that even if stack size is increased, an array of this size should be global

You can also use a single statement to allocate a 2D array on heap if one dimension is fixed in size

double (* E)[COLUMN_SIZE];
int rows = 20; // this is dynamic and can be input from user at run time
E = malloc(rows * sizeof(*E)); // this needs to be freed latter

A more detailed similar example allocating 2d array without loops