I'm trying to use GRIDDATA, but I find it incredibly slow and running out of memory very easily. This is the command: grid = GRIDDATA(new_easting, new_northing, new_array, /GRID, xout=xout, yout=yout) - new_easting is a 211*179 long array with x coordinates of my data set - new_northing is a 211*179 long array with y coordinates of my data set - new_array is a 211*179 integer array with the values of my data set - xout is a 2736 long array with the x coordinates I want my data gridded and interpolated to - yout is a 2736 long array with the y coordinates I want my data gridded and interpolated to I'm running IDL 7.1.1, 64-bit version, using Windows 7 on a 3GHz Intel dual processor. Running the grid command causes the software to stop - IDL never moves on to the next line. If I manually stop the program, then continue it, it moves on. But not without manual intervention. Strange. In addition, if I try to make my xout and yout ~27 million long arrays (as I originally wanted), I run out of memory. As far as I can tell, this shouldn't be the case when I'm running a 64-bit version of IDL. Can anybody help? Anders