- k(1,t) < 10 returns a vector, not a scalar
- Similarly, Ca(t) is a vector.
- It looks like you really want to loop through all the elements and if that's the case, you need to deal with one t a time
- If above is true, you probably want to use && instead of &
- Based on all above, you can see that your current script is only executed once and it lands in the last condition.
- Finally, you may want to consider vectorizing the code using logical index and in that case you do want to use &, not &&. As an example:
Strange If- else statement issue
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Hi, Iam trying to write a very simple program. That is the program i wrote:
t=1:1:8760
k=rem(t,24)
if k(1,t)<10 & k(1,t)>1
Ca(t)=10
elseif k(1,t)<20 & k(1,t)>10
Ca(t)=20
else
Ca(t)=40
end
I just want that if the k(1,t) is between 1 and 10, Ca(t) should be 10. So for k(1,t)=1,2,3...9, it should be Ca(1)=10, Ca(2)= 10.... Ca(9)=10.
if the k(1,t) is between 10 and 20, Ca(t) should be 20. So for k(1,t)=10,11...,19, it should be Ca(11)=20, Ca(12)= 20.... Ca(19)=20.
else it should be, Ca(t)=40 (Ca(21)=40, Ca(22)=40...)
But i get as result always Ca(t)=40. So i get for all values of t, the result 40.
What am i doing wrong?
Thanks
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Réponse acceptée
Honglei Chen
le 24 Juil 2012
Modifié(e) : Honglei Chen
le 24 Juil 2012
There are several issues.
Ca = 40*ones(size(t));
Ca(k(1,t)<10 & k(1,t)>1) = 10;
2 commentaires
Honglei Chen
le 24 Juil 2012
Your t is a vector, that's why the result of k(1,t) is a vector. If you want to deal with them one at a time, you should use a loop, for example,
for m = 1:numel(t)
if k(1,m)<10 && k(1,m)>1
Ca(m)=10
end
end
But in this case you should use &&, not &.
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