how do I declare a variable matrix of any size?

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Hi,
I need to export geometry from the PDE toolbox without using the menu at the top (using command line). When I use decsg, gd is undefined. I have tried using sym gd, that didn't work. When setting up zero matrices, the index exceeds dimensions. I know this is a basic question, I can't find the answer in the forum or online.
Thanks in advance

Answers (1)

Shaun VanWeelden
Shaun VanWeelden on 19 Apr 2013
If you could give us your exact code you are trying now, that would be really helpful. zeros(your matrix size) should work fine no matter what toolbox you have. Unless your question is about having an unknown number of output variables.
If you know the number of output variables, like if I wanted to find the size of a 2-d matrix I would do something like this [numRows, numCols]=size(twoDmatrix);
Similarly, you can do that for output with multiple variables.
If you don't know the # of output vars, it gets more complicated, but I remember somehow being able to capture everything in a cell array, I think using the deal function or something like that.
  4 Comments
Ruben Gavín Mulelro
Ruben Gavín Mulelro on 26 May 2021
Hello Brian,
It is not possible to use gd function if the geometry is not exported before.
I have the same problem. I am not able to export the geometry automatically, so I can't reach to resolve the problem for different dimensions.
Tell me something If you finally achieve it.
Thank you

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