How do I stop the calculation in a for loop?

Question

gamer 2021-6-13

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/855070-how-do-i-stop-the-calculation-in-a-for-loop

评论： gamer 2021-6-14

采纳的回答： Walter Roberson

在 MATLAB Online 中打开

Hello community!

First of all thanks for your help:)

n = 4;
v = rand(n,2);
for f = 1:1000
  
  v = v-0.001
end

Thats already what I ve got. It gives me 1000 of matrixes back and alyways calculated by - 0.001. Now I ve got problem. If one element of the matrix (for example matrix Number 94) is already smaller than 0.001, then this element should be for all other matrixes ( 95 - 1000) equal to zero. I hope you have some advice! Thanks.

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Answer 1

Walter Roberson 2021-6-13

0
链接

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https://ww2.mathworks.cn/matlabcentral/answers/855070-how-do-i-stop-the-calculation-in-a-for-loop#answer_723745

在 MATLAB Online 中打开

The division by 50 is just to make the output shorter for this demonstration.

format long g
n = 4;
v = rand(n,2) / 50;
for f = 2:1000
  temp = v - 0.001;
  temp(temp < 0.001) = 0;
  v = temp
  if ~any(v(:)); break; end   %all 0
end
v = 4×2
        0.0117169155857542       0.00385373115144157
       0.00322072350669969        0.0123980988902088
       0.00540972017890342       0.00679499574461224
        0.0119082492555772                         0
v = 4×2
        0.0107169155857542       0.00285373115144157
       0.00222072350669969        0.0113980988902088
       0.00440972017890342       0.00579499574461224
        0.0109082492555772                         0
v = 4×2
       0.00971691558575421       0.00185373115144157
       0.00122072350669969        0.0103980988902088
       0.00340972017890342       0.00479499574461224
       0.00990824925557724                         0
v = 4×2
       0.00871691558575421                         0
                         0       0.00939809889020883
       0.00240972017890342       0.00379499574461224
       0.00890824925557724                         0
v = 4×2
       0.00771691558575421                         0
                         0       0.00839809889020883
       0.00140972017890342       0.00279499574461224
       0.00790824925557724                         0
v = 4×2
       0.00671691558575421                         0
                         0       0.00739809889020883
                         0       0.00179499574461224
       0.00690824925557724                         0
v = 4×2
       0.00571691558575421                         0
                         0       0.00639809889020883
                         0                         0
       0.00590824925557724                         0
v = 4×2
       0.00471691558575421                         0
                         0       0.00539809889020883
                         0                         0
       0.00490824925557724                         0
v = 4×2
       0.00371691558575421                         0
                         0       0.00439809889020883
                         0                         0
       0.00390824925557724                         0
v = 4×2
       0.00271691558575421                         0
                         0       0.00339809889020883
                         0                         0
       0.00290824925557724                         0
v = 4×2
       0.00171691558575421                         0
                         0       0.00239809889020883
                         0                         0
       0.00190824925557724                         0
v = 4×2
                         0                         0
                         0       0.00139809889020883
                         0                         0
                         0                         0
v = 4×2
     0     0
     0     0
     0     0
     0     0

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Walter Roberson 2021-6-13

在 MATLAB Online 中打开

p = [r + (a-2*r)*rand(n,1),r + (b-2*r)*rand(n,1)];
v = rand(n,2);
 
for f = 1:1000 
    temp = v - 0.001 ; 
    temp(temp < 0.001) = 0 ; 
    v = temp ;
    if ~any(v(:)); break; end
    p = p + v
end 