How do I create an array of a function output?
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FortuitousMonkey
on 25 Feb 2018
Commented: Cedrick De Block
on 10 Nov 2020
How do I create an array of a function output? Each attempt I've tried it overwrites the value in the array and returns a 1x1 array with the final value calculated as it's value.
I've seen nested list functions or push functions? Which is the best for the below case and how do I implement it?
Apologies if this is a simplistic question, just struggling with this problem.
My function is:
>> m=0:1:3
>> n=0:1:4
>> for a=m
for b=n
res=ack(a,b)
end
end
function res=ack(m,n)
if m==0
res = n+1;
elseif m>0 && n==0
res = ack(m-1,1);
elseif m>0 && n>0
res = ack(m-1,ack(m,n-1));
end
end
1 Comment
David Fletcher
on 25 Feb 2018
Edited: Stephen23
on 26 Feb 2018
Essentially your problem is very similar to the answer I provided for
Maybe not the 'best' way to do it, but it is pretty much the answer to the problem you are outlining
Accepted Answer
Stephen23
on 26 Feb 2018
Method one: nested loops and indexing
m = 0:3;
n = 0:4;
out = nan(numel(m),numel(n));
for km=1:numel(m)
for kn=1:numel(n)
out(km,kn) = ack(m(km),n(kn));
end
end
giving:
out =
1 2 3 4 5
2 3 4 5 6
3 5 7 9 11
5 13 29 61 125
Method two: arrayfun:
>> [M,N] = ndgrid(m,n);
>> out = arrayfun(@ack,M,N)
out =
1 2 3 4 5
2 3 4 5 6
3 5 7 9 11
5 13 29 61 125
2 Comments
Cedrick De Block
on 10 Nov 2020
hello excuse me,
in your fist example I have a problem with "ack"
matlab doesn't reconise it, is it a function?
More Answers (1)
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