Function input vector specifiers

Question

Jay 2020-10-1

回答： Ameer Hamza 2020-10-1

Is there a way to specify all elliments of a vector in a functions input term?

ie. instead of writing

val_1 = mat_val(1,1)
val_2 = mat_val(1,2)
val_3 = mat_val(1,3)
val_4 = mat_val(1,4)

function [ret_val] = filename (val_1, val_2, val_3 , val_4)
ret_val = val_1*val_3 - val_4 + val_2
end

I can have a specifer with the correct syntax to match

function [ret_val] = filename(mat_val(1,:))
ret_val = val_1*val_3 - val_4 + val_2
end

The functions return will be called in a seperate script file.

Thanks

Answer 1

Ameer Hamza 2020-10-1

It is always a good idea to use an array instead of separate variable names: https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval. However, the following shows a somewhat acceptable way

function [ret_val] = filename(varargin)
    [val_1, val_2, val_3, val_4] = varargin{:};
    ret_val = val_1*val_3 - val_4 + val_2;
end

Call it like this

y = filename(1, 2, 3, 4)