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The size of the indicated variable or array appears to be changing with each loop iteration. Commonly, this message appears because an array is growing by assignment or concat

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Hosein Jeddi
Hosein Jeddi on 19 Jul 2021
Commented: Stephen on 19 Jul 2021
clc
clear
h = 1;
r = 0:h:20;
z = 0:h:20;
[rgrid,zgrid] = meshgrid(r,z);
zgrid = flip(zgrid);
b1=[];
for i=1:size(rgrid,1)*size(zgrid,2)
if zgrid(i) == min(min(zgrid))
b1 = [b1 i];
end
end

Accepted Answer

Stephen
Stephen on 19 Jul 2021
Edited: Stephen on 19 Jul 2021
h = 1;
r = 0:h:20;
z = 0:h:20;
[rgrid,zgrid] = meshgrid(r,z);
zgrid = flip(zgrid)
zgrid = 21×21
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 17 17 17 17 17 17 17 17 17 17 17 17 17 17 17 17 17 17 17 17 17 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11
Simpler, faster code:
b2 = find(zgrid==min(zgrid(:))).'
b2 = 1×21
21 42 63 84 105 126 147 168 189 210 231 252 273 294 315 336 357 378 399 420 441
or even simply:
n3 = numel(z);
b3 = n3:n3:n3*numel(r)
b3 = 1×21
21 42 63 84 105 126 147 168 189 210 231 252 273 294 315 336 357 378 399 420 441
Your code:
b1 = [];
for i = 1:size(rgrid,1)*size(zgrid,2)
if zgrid(i) == min(min(zgrid))
b1 = [b1 i];
end
end
b1
b1 = 1×21
21 42 63 84 105 126 147 168 189 210 231 252 273 294 315 336 357 378 399 420 441

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