alternative form for find(max(x))

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GCats
GCats on 4 Apr 2020
Edited: dpb on 4 Apr 2020
Hi all!
I am trying to optimize my program by reducing the nested coding and perhaps "slow" functions such as find().
I have this:
gamma = 0.5
nodes = 5
if rand >= gamma
a = find(A(s(1),s(2),:) == max(A(s(1),s(2),:)),1);
else
a = randi(nodes);
end
A is a n x m x o matrix.
I was wondering if there's a different way to tackle this. I've looked at accum() but I don't seem to make it work properly. Thank you in advance!

Accepted Answer

dpb
dpb on 4 Apr 2020
if rand >= gamma
[~,imx]=max(A(s(1),s(2),:);
a=imx;
else
a = randi(nodes);
end
  2 Comments
dpb
dpb on 4 Apr 2020
Edited: dpb on 4 Apr 2020
I've never caught it doing otherwise altho not sure it is documented...
ADDENDUM: Actually it is...
"If the largest element occurs more than once, then I contains the index to the first occurrence of the value."

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