endif
## find the grid spacing and ramp width
- if (nargin>4 && length(grid_n)>1) || \
- (nargin>5 && (length(grid_n)>1 || length(ramp_n)>1))
+ if (nargin>4 && length(grid_n)>1) || (nargin>5 && (length(grid_n)>1 || length(ramp_n)>1))
usage("grid_n and ramp_n must be integers");
endif
if nargin < 4, grid_n=512; endif