How to return an individual matrix from a function that uses multiple?
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Lakerpurp24
el 20 de Feb. de 2020
Comentada: Walter Roberson
el 20 de Feb. de 2020
I have a nested parent function that operates on multiple matrices using other functions. I then want to return individual matrixes to others. Ive listed toy code below as a general example of what im trying to do:
% id like to return these matrices in a wat so that i could assign them elsewhere like:
% g = fun(d)
function fun1 = fun(a, b,c,n)
for i = 1:1:lentgth (n)
d(i) = add(a(i),b(i));
e(i) = subtract(a(i),c(i));
f(i) = multiply(b(i),c(i));
end
end
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Walter Roberson
el 20 de Feb. de 2020
On your code whatever you assign to fun1 would be returned. You can also do things like
function [d, e, f] = fun(a, b, c, n)
And then three matrices would be returned positionally.
3 comentarios
Walter Roberson
el 20 de Feb. de 2020
[mat1, mat2, mat3] = fun(a, b, c, n)
Use your choice of output variable names.
Yes there is a way to assign into the workspace so that you do not need to use assignments. However that is seldom good programming, and MATLAB is increasingly making changes that lead to odd outcomes when you do such a thing. The short explanation is that the execution engine optimization phase is notably less efficient when MATLAB needs to take into account assignments that are not obvious in the code being executed, so Mathworks is increasingly saying "ok, we'll let that kind of behaviour break in favour of the greater efficiency!" In the fine details, the optimization is making choices more like a compiler and less like an interpreter. The kind of assignment that you want to do used to be fine when MATLAB always choose consistency with interpreter over efficiency.
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