How to return a value in a recursive function in MATLAB

Question

Arindam Bose 2019-3-25

0
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https://ww2.mathworks.cn/matlabcentral/answers/452093-how-to-return-a-value-in-a-recursive-function-in-matlab

评论： Arindam Bose 2019-3-25

I have a recursive function to calculate the multiplicative persistence of an integer. I can print the value inside the function. My question is how can I return the value to the outside of the function.

Here is my code:

I want to return the value of num

function per(n, varargin)
if nargin == 1
    num = 0;
else
    num = varargin{1};
end
s = num2str(n);
if (length(s) == 1)
    disp(['Persistence: ' num2str(num)]);
    return;
end
num = num + 1;
res = 1;
for i = 1:length(s)
    res = res * str2double(s(i));
end
per(res, num);
end