How can I tell matlab to go back and recalculate?

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MC3105 2014-11-17

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评论： per isakson 2014-11-17

Hey everyone,

I am wondering what tricks I can use to tell matlab to go back to a certain point in my code?

I am doing a calculation that uses random numbers (normrnd(0,1)). At the end of the calculation I compare the result with a certain value. If my result is too small or too large, I need to recalculate, using different random numbers. So I want to tell Matlab to go back and start over...

Do you have any ideas how to do this? As I am still pretty new to Matlab, please tell me the easiest way, not the most beautiful one :)

Thanks!!

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per isakson 2014-11-17

The answer is the same for most languages: &nbsp while, ..., end

And see the classic paper: Go To Statement Considered Harmful, by Edsger W. Dijkstra

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Answer 1

Giorgos Papakonstantinou 2014-11-17

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Maybe with a while loop. Let's say that you want to recalculate if your result is 10^-2 grater/smaller from your certain value.

So you would define a tolerance:

tol = 1e-2; % your tolerance
myvalue = 10; % you certain value
result = 0; % initialize result
calc = 100; % initialize calc, which is the difference between the result and your certain value
while calc>tol % your condition
    % write here all you code
    result = rand(1)*10;
    calc = abs(result-myvalue); % update at each iteration calc
end