GRDWRITE2(X,Y,Z,'file.grd') will create a grid file containing the data in the matrix Z. X and Y should be either vectors with dimensions that match the size of Z or two-component vectors containing the max and min values for each. The file will be a COARDS-compliant NetCDF file, the standard format for GMT version 4 and later.
Based on the compiled mexfile-based function grdwrite, part of the GMT supplemental packages.
For more information on GMT grid file formats, see:
GMT (Generic Mapping Tools) was developed by Paul Wessel and Walter H. F. Smith (http://gmt.soest.hawaii.edu)
See also GRDREAD2, GRDINFO2