Variable size class properties for C++ code export

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Torsten Knüppel
Torsten Knüppel 2019-7-10
评论： Viet Nguyen 2020-3-10
Dear all,
I would like to use a class as input to a function that is later exported to C++-code.
Something like:
classdef inputClass
properties
var(:, 1)
b = 0
end
end
Here var(:, 1) means, that I want var to be of variable size. However, as soon as I use var the coder complains about mismatching sizes, stating that var is of size 0x1. Can I somehow declare a class property to be of variable size? According to the page here, coder.varsize does not work.
Thanks in advance
Torsten
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winkmal
winkmal 2019-8-14
Which Matlab version are you on? I don't have Coder either, but this reminds me very much of a problem I had some time ago, which turned out to be a bug! This was in R2017b, so it should be fixed by now. Read here for details.
Viet Nguyen
Viet Nguyen 2020-3-10
Did you end up getting this resolved? I am running into the same error.

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回答（1 个）

Sayyed Ahmad
Sayyed Ahmad 2019-7-10
The defination of var is wrong.
it's ok if you write
classdef inputClass
properties
var;
b = 0
end
methods
function o = inputClass(varargin)
if nargin == 2
o.var = varargin{1};
o.b= varargin{2};
else
error("the nuber of arguments do not match!")
end
end
end
end
>>x=inputClass([1 2 3],2)
x =
inputClass with properties:
var: [1 2 3]
b: 2
  2 个评论
Guillaume
Guillaume 2019-7-10
编辑：Guillaume 2019-7-10
"The defination of var is wrong."
From a pure matlab point of view (ignoring coder), there is nothing wrong with the definition of var. Can you explain what you mean by that?
Sayyed Ahmad
Sayyed Ahmad 2019-7-10
you can def. a variable without dimension or a fix dimension. But a def. like var(:,1) could not be handel by compeiler.
Compeiler could be handel a calling of variable by var(:,1) but not the def. of variable.

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