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Calling user functions recursively

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Isabelle Armanville
编辑： Stephen23 2017-2-20
I have user created functions called f11(), f12(), f13(), f21(), f22(), f23()... I want to call these function recursively for i=1 to n for j=j to m eval(fij()) I have tried with the eval() function. It does not work. Could someone help me? thank you
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John D'Errico
John D'Errico 2017-2-20
And yet another reason not to write numbered functions, numbered variables, etc. Regardless, you are asking to call them in sequence, but not recursively. A recursive call is one where a function calls itself.

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回答（2 个）

dbmn
dbmn 2017-2-20
First of all: Listen to John - he is right about this. Try not to use numbered functions and variables (you can read why this is a bad idea on numerous posts on Matlab Answers - just search).
But because I know you gonna try it anyway, here is a solution
A) Do nothing but change your eval to: (BAD)
eval(sprintf('f%d%d()', i, j))
B) Create a function caller that handles your functions (Better, but uses still the numbered functions - but at least it can be debugged)
function [] = function_caller(idx)
switch idx
case 1
% your function here
case 2
% your function here
end
end
C) Rewrite your code and avoid the numbered functions - there must be a smarter way to do this.
Work with Functions and Subfunctions instead and try to get a clear image about what your code actually needs to do in what order.
Stephen23
Stephen23 2017-2-20
编辑：Stephen23 2017-2-20
Why not just put the functions into a cell array, then this is trivial:
>> C = {@rand,@()randi(9,1),@()randi([10,20],1)};
>> cellfun(@(f)f(),C)
ans =
0.91338 6 11
or
for k = 1:numel(C)
C{k}()
end
Calling numbered functions is not a good solution:
https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

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