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Can we remove a bar from histogram which drawn using 'hist' function?

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Jaanu
Jaanu 2012-11-20
Hi, I have a data and i tried to calculate mean and standard deviation for that data values. where lots of zeros are there and i don't need to include that zeros for my data range. my data range is in Matrix.
I need to calculate mean and standard deviation only for data except zero values. Please help on this problem.
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Image Analyst
Image Analyst 2012-11-20
I think he has a huge bar for the "zero" bin and he wants to suppress that bar because it makes all the other bars so short. He can either set the "counts" value to zero for that bin, or just avoid seeing any zeros in the first place when he calculates the histogram, like you suggested.

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回答（1 个）

José-Luis
José-Luis 2012-11-20
idx = your_data ~=0;
You can now calculate the mean and standard deviation:
your_mean = mean(data(idx));
your_std = mean(data(idx));
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José-Luis
José-Luis 2012-11-20
It would appear so
x=rand(100000,1) > 0.5;
tic
mean(x(x~=0));
toc
tic
sum(x)/(length(x)-sum(x == 0));
toc
Elapsed time is 0.002031 seconds.
Elapsed time is 0.000810 seconds.

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