Selecting cross values from two arrays
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I have three arrays namely, s = [0,1000,2000], d = [0,1000,2000] and J = [0,5000,8000], where, J = 3*d+2000. Now within a for loop, when s(1) and d(1) are selected, I want to select J(1). When s(2),d(1) is selected, I want to select J(3). When s(2), d(2) is selected, I want to select J(2). What would be a generic way of doing this instead of hard coding?
2 Comments
Raj
on 13 Sep 2019
Sorry but your question is not clear at all.
"when s(1) and d(1) are selected" - What do you mean by 'selected'? you want user to give selection inputs?
"I want to select J(1)" - You want J(1) to get computed here or you already have J matrix before 'for' loop and you want to select J(1) & do something with it?
Mahesh Taparia
on 17 Sep 2019
Hi,
Can you explain what you want to do with these matrices, your doubt is not clear.
Answers (2)
KALYAN ACHARJYA
on 17 Sep 2019
Edited: KALYAN ACHARJYA
on 17 Sep 2019
Form the question, if you pattern the s,d, and J , it becomes
1 1 1
2 1 3
2 2 2
Have you find any pattern on the sequence? I dont think so...(one label condition)
Though you can do that by mutiple loops and condition statements, but direct implementation is much easier and faster here.
"What would be a generic way of doing this instead of hard coding?"
In addition, all vectors having 3 lengths only, you can do it by direct implementation, why do you think you have to go for "for loop" here.
Good Luck!
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Andrei Bobrov
on 17 Sep 2019
s = [0,1000,2000];
d = [0,1000,2000];
J = [0,5000,8000];
ii = fullfact([3,3,3]);
out = [s(ii(:,1))',d(ii(:,2))',J(ii(:,3))'];
or
[ii,jj,k] = ndgrid(s,d,J);
out = [ii(:),jj(:),k(:)];
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