# Evaluate an anonymous function for each value in a matrix

3 views (last 30 days)
Payson on 4 May 2023
Answered: Dyuman Joshi on 4 May 2023
I want to evaluate a function for every value in a matrix, but MATLAB thinks I want to input the entire matrix into the function.
f = @(x) x*sin(x);
a = [1 2 3;4 5 6];
f(a)
ERROR: "incorrect dimensions"
^this makes sense because it thinks i want a*sin(a) instead of a(i,j)*sin(a(i,j) for i = 1:3 and j = 1:2
In another implementation like multiplication I would use ".*" to signify elemtwise calculations so I am assuming there is something similar for anonymous functions.
I could use a loop for this example but I want to implement it in a more complicated application so I would be a much larger headache.

Dyuman Joshi on 4 May 2023
"In another implementation like multiplication I would use ".*" to signify elementwise calculations so I am assuming there is something similar for anonymous functions."
Yes, use element-wise operations while defining the function handle
f = @(x) x.*sin(x);
a = [1 2 3;4 5 6];
f(a)
ans = 2×3
0.8415 1.8186 0.4234 -3.0272 -4.7946 -1.6765

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