How to calculate average with taking into account only certain values

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afrya
afrya 2014-3-31
评论： afrya 2014-4-3
Hello,
I'm working with a large matrix that contains a lot of zero values.When I transform this matrix from a list table to a cross table, I have more zero values in it.I want to keep all the initial values in it and and supress all the zero values added from matlab for the calculation of the average.Here is an example of what I want to do:
x=
0.6000 0.6000 5.0000
0.6000 0.8000 6.0000
0.6000 0.8500 0
0.6000 0.8200 0
0.8000 0.8000 9.0000
0.8000 0.9000 2.0000
List table to cross table
NaN 0.6000 0.8000 0.8200 0.8500 0.9000
0.6000 5.0000 6.0000 0 0 0 Average=(5+6+0+0)/4=2,75
0.8000 0 9.0000 0 0 2.0000 Average=(9+2)/2=5,5
Thanks in advance

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回答（1 个）

Image Analyst
Image Analyst 2014-3-31
I don't know what the cross table stuff means, but to get the mean of an array going across columns, you can do this:
xRowMeans = sum(x, 2) ./ sum(x ~= 0, 2)
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Image Analyst
Image Analyst 2014-3-31
I don't know what the calcul is but you can do this:
rowMeans = sum(calcul, 2) ./ sum(calcul ~= 0, 2)

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