Iterative loop storing variables

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conor meaney
conor meaney 2015-1-29
回答： Cedric 2015-1-29
So I'm using a 'while-end' loop for a particular code in MATLAB, the particular criterion to end the loop I'm using is such that the value for a variable between the nth iteration and nth-1 iteration is a pre-defined value.
e.g.
Inputs for: variables, constants, etc.
while: abs(variable 'nth' iteration - variable 'nth-1' iteration) >= pre-defined value
- - - MATLAB CODE HERE - - - ETC.
end
I was just wondering how would I perhaps go about scripting it, do I have to store the variable each iteration and bring it back into the next iteration? I'm struggling to see how to do this exactly, I'm not particularly use to loops in MATLAB.
I would appreciate a push in the right direction!
Conor.

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回答（1 个）

Cedric
Cedric 2015-1-29
Here is an example
a = 100 ; % Initial value.
a_last = Inf ;
threshold = 5 ;
while abs(a - a_last) >= threshold
% Save previous value of a.
a_last = a ;
% Compute new value.
a = a - sqrt( a ) ;
% Do whatever else..
disp( a ) ;
end

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