How to find exact match for negative value.
1 view (last 30 days)
Show older comments
Y=sum(y);
YY=abs(Y);
p=20*log10(YY/max(YY));%normalized power in dB.
P=round(p);
[c]=find(P==-3);
bw=c(1,2)-c(1,1);
I used this find() function to find all the vectors that has the exact value. But, then i have this error:
??? Attempted to access c(1,2); index out of bounds because size(c)=[1,0].
Error in ==> Q10 at 54
bw=c(1,2)-c(1,1);
0 Comments
Answers (1)
the cyclist
on 29 Feb 2012
If no element of P is equal to -3, then c will be empty, and you will get this error.
4 Comments
the cyclist
on 29 Feb 2012
Two comments. One is that since you are checking against -3, not +3, the check should have been abs(P+3)<tol. Second, I would still say your rounding approach should have worked here, so my suspicion is that for some reason, your vector P does not actually have values near -3. You could breakpoint the code before the error occurs, to look at the values.
See Also
Categories
Find more on Logical in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!