Why there is error for "str_id = num2str(gr​id_id,'%2.​2i');"? what should I change?

Why there is error for "str_id = num2str(grid_id,'%2.2i');"? what should I change? the error message is:

Not enough input arguments.

Error in data_proc (line 174) str_id = num2str(grid_id,'%2.2i');

[Guillaume]

If you want help with an error, at a minimum state what the error is. We certainly can't guess. Best is to copy the full error message, everything in red.

Answer 1

[Guillaume]

"Why there is error"

Most likely, because you called data_proc with less than 4 arguments. The error will happen if you call data_proc with, for example,

data_proc(0, 10, 2)

instead of

data_proc(0, 10, 2, 6)