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arrayfun syntax and use with scalar input

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checker
checker 2020-5-28
评论： checker 2020-5-28
Hello people,
I've been (ab)using arrayfun and cellfun for some time without fully understanding the syntax. It centers around '@' symbol followed by the arguements.
To demonstrate, if I want to add 2 arrays, I can do:
a=[1 2;3 4];
b=[5 6;7 8];
c=arrayfun(@(x,y) x+y,a,b);
But what if I wanted to simply add a scalar?
a=[1 2;3 4];
b=2;
c=arrayfun(@(x,y) x+y,a,b);
Error: All of the input arguments must be of the same size and shape.
Previous inputs had size 2 in dimension 1. Input #3 has size 1
So is there a good summary of arrayfun as it's used above? Can one treat an input as a scalar or vector and others as arrays?
Thanks,
-Chris
  2 个评论
Stephen23
Stephen23 2020-5-28
"Can one treat an input as a scalar or vector and others as arrays?"
No, but you can easily parameterize the function using an anonymous function:
https://www.mathworks.com/help/matlab/math/parameterizing-functions.html
checker
checker 2020-5-28
Thanks for the link. I'll spend some time on it.

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采纳的回答

James Tursa
James Tursa 2020-5-28
To use a scalar you could use this syntax:
a=[1 2;3 4];
b=2;
c=arrayfun(@(x)x+b,a);
The function handle would pick up b from the workspace.

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