# How do I stop the calculation in a for loop?

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gamer on 13 Jun 2021
Commented: gamer on 14 Jun 2021
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.

Walter Roberson on 13 Jun 2021
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
gamer on 14 Jun 2021
Thank you so much!