The CLASS function must be called from a class constructor.
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I'm currently working on a project involving some automatic differentiation, and was presented an example code to such an approach. My problems really boil down to me never working with OOD in Matlab before and it seems really overwhelming. The first part of the code looks like this, fairly straight forward. The problem is it won't run past the last line.
function ad = autodiff(val, der)
% A naive autodiff constructor.
ad.val = val;
if nargin == 1
der = 0.0;
end
if strcmp(der,'variable')
der = 1.0;
end
ad.der = der;
ad = class(ad, 'autodiff');
I get the error 'The CLASS function must be called from a class constructor', which I do not know how to deal with. How do I create custom classes and then call upon them later?
thanks in advance, Kristian
2 Comments
James Tursa
on 6 Feb 2013
Did you have this file in a directory named '@autodiff', and is the directory that the @autodiff folder is in on the MATLAB path?
Accepted Answer
Cedric
on 5 Feb 2013
Edited: Cedric
on 5 Feb 2013
If you want to learn OOP in MATLAB, have a look at this document: MATLAB Object-Oriented Programming.
Basically, you want to create autodiff.m with a structure that will look like
classdef autodiff
properties
val
der
end
methods
function self = autodiff(val, der) % Constructor.
self.val = val;
if nargin == 1, self.der = 0.0; end
if strcmp(der,'variable'), self.der = 1.0; end
end
function self = aMethod(self, ...)
...
end
end
end
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