- ##
- ## A version of the wood_gradient() function which takes a column
- ## 4-vector instead of four distinct arguments. See wood_gradient.m
- ## for more information.
- ##
- g = wood_gradient(x(1), x(2), x(3), x(4));
+ %
+ % A version of the wood_gradient() function which takes a column
+ % 4-vector instead of four distinct arguments. See wood_gradient.m
+ % for more information.
+ %
+ if (length(x) == 4)
+ g = wood_gradient(x(1), x(2), x(3), x(4));
+ else
+ g = NA;
+ end