How to check condition element by element till satisfied

Question

Offroad Jeep 2016-5-8

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/283134-how-to-check-condition-element-by-element-till-satisfied

回答： Elias Gule 2016-5-9

if true
  clc
clear all
format compact
a = ones(5)
w_rand = rand()
if w_rand > 0.5
a = -1
end

I want to generate random numbers for each element. now in the first condition the elements which get w_rand > 0 should flip to -1 and its value is fixed. now again the w_rand should be generated for the remaining 1 which satisfy the condition of w_rand should flip to -1. and the process goes on till the time all 1 goes to -1. in my code the all values change to -1 at once. where as i want to do this element by element

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Image Analyst 2016-5-8

"a" is a 5-by-5 array of random numbers. In your "first condition" you get an random number and check if it's greater than 0.5 and then "the elements" get set to -1. WHICH elements should get flipped? All of them? Some of them? Is so, which ones? All you're doing is changing "a" from a 5-by-5 array to a single scalar number. Anyway, you're going to need a while loop and the all() function to check that every element in "a" got set to -1.

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Answer 1

Elias Gule 2016-5-9

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/283134-how-to-check-condition-element-by-element-till-satisfied#answer_221423

在 MATLAB Online 中打开

I hope this is what you're looking for:

a   = ones(5);
sz = size(a);
a  = a(:);
count = 0;
isDebug = true; %%So you know the while loop is running
for kk = 1 : length(a)
  akk = a(kk);
  while rand() < 0.5
      if isDebug
          fprintf('a(%d) = %d;\n',kk,akk);
      end
  end
  a(kk) = -1;
end
a = reshape(a,sz);