Reduce one for loop?
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Farzaneh ziaee
on 11 Feb 2016
Commented: Walter Roberson
on 12 Feb 2016
Hello, I have a bunch of code in which there are 2 for loops. I want to increase the speed and have just one for loop. here is the lines:
for i=1:length(bid)
for j=1:pidlastindex
if(bid(i)==pid(j))
C(i) = delay(j);
end
j=j+1;
end
i=i+1;
end
To do so I did :
for i=length (bid)
C(i)=delay(bid==pid(i))
end
But I get an error: In an assignment A(:)=:B, the number of elements in A and B must be the same.
Could any one tell me what is wrong here?
Also C in that loop changes the dimension on every loop iteration.
Thanks.
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Accepted Answer
Walter Roberson
on 11 Feb 2016
What if there are multiple locations that match the bid? What if there are no locations that match the bid? What if one of the values is 23.45 and the other value is 23.45+(4e-15) and you can't tell the difference because they both show up as 23.45 on the screen?
2 Comments
Walter Roberson
on 12 Feb 2016
If pid is the unique values in bid then bid==pid(i) can be true in multiple locations in bid. That would select multiple delay, and you cannot store multiple values into the single destination C(i).
Perhaps you want something like
delay(find(bid==pid(i), 1, 'first'))
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