###############################################
# scriptfile: usr_surface_3d_2.lsf
#
# description: This file creates a surface text
#     file for an import primitive. This file
#     creates a matrix with x and y reversed
#     because the x increases along the rows
#     and y along the columns. It should be
#     imported with the "invert x and y axis"
#     button selected.
#
# Copyright 2007, Lumerical Solutions, Inc.
###############################################

# generate a surface
nx = 50;
ny = 40;
x = linspace(-6,6,nx);
y = linspace(-5,5,ny);
X = meshgridx(x,y);
Y = meshgridy(x,y);
Z = exp(-(X^2+Y^2)/4^2) * sin(pi*Y/2);

# choose a filename and delete file if it exists
filename = "usr_surface_3d_2.txt";
rm(filename);

# write the data to file
write(filename,num2str(Z));