Hi Samuel To be able to execute your example (using Scilab 6.0.0, MS Win7) I had to provide ndgrid with two inputs: [Xo, Yo] = ndgrid(-10:0.5:10,-10:0.5:10); Cheers, Claus -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://lists.scilab.org/pipermail/users/attachments/20180203/016f3aea/attachment.htm>