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Matrix, Mean coloum 2, with a value in coloum 1 < 25

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Kasper Jørgensen
Kasper Jørgensen 2015-3-31
评论： Kasper Jørgensen 2015-3-31
Hello!
I am looking at a 5 x 2 matrix, which i need to mean certain numbers in the secound coloum. But the mean depends on what the value the first coloums has.
Here is the Matrix:
M =
25 0.1090
23 0.0960
15 0.5170
40 0.9340
35 0.1090
For all numbers in coloum 1 < 25, i need to mean the numbers in coloum 2
I have been searching this site for a long time after an answer, but found nothing.
I hope you can help me! :)
Thanks!

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Michael Haderlein
Michael Haderlein 2015-3-31
编辑：Michael Haderlein 2015-3-31
just:
mean(M(M(:,1)<25,2))
The keyword here is logical indexing, btw. You can find good tutorials about it online.

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