With this function you can specify a region of the grid in which to multiply each cell value by a given amount.NOTE: This function will only work with real numbers, not strings.
ds_grid_multiply_region(index, x1, y1, x2, y2, val);
|index||The index of the grid.|
|x1||The x position of the left of the region in the grid.|
|y1||The y position of the top of the region in the grid.|
|x2||The x position of the right of the region in the grid.|
|y2||The y position of the bottom of the region in the grid.|
|val||The value to multiply with the region cells.|
ds_grid_multiply_region( mygrid, 5, 5, 10, 10, 2
The above code will take all the values found within the defined rectangular grid area and multiply each one by 2.