For loop help!

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BiaoZhun
BiaoZhun 2020-11-18
回答： Stephen23 2020-11-18
I need helpt with a for loop to pick numbers from a vector and put them in an existing non square in the order shown in the figure below (hop it makes sense). It starts at the dot and then follow the arrow. the resulting matrix should be as the one in the blackbackgrownd figure.
Sorry if this has been asked before <3 .
Thank you.
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James Tursa
James Tursa 2020-11-18
Start with 3 and increment by 3's, then start with 2 and increment by 3's, then start with 1 and increment by 3's?
BiaoZhun
BiaoZhun 2020-11-18
yes, but it has to start one after the other, starts with 3(lets say n) and increments by 3's and then goes through the whole vector and then starts 2(n-1) an incremebts by 3's then goes through the whole vector agian, and then starts at 1(n-2) and increments by 3's. Hope this makes a better idea of the problem.

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Stephen23
Stephen23 2020-11-18
Ran in:
"... so becase of the amount of data i need a for loop"
I doubt that using a loop would be a good approach.
V = 1:12;
R = 3;
M = flipud(reshape(V,R,[]))
M = 3×4
3 6 9 12 2 5 8 11 1 4 7 10
●
Your larger vector:
V = rand(118668,1);
R = 9889;
M = flipud(reshape(V,R,[]));
size(M)
ans = 1×2
9889 12
●

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