mean and standard deviation code

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joo
joo 2012-11-28
i have
3 2 4
2 3 7
4 2 3
i want the mean
3 (3+2+4 /3)
4 (2+3+7 /3)
3 (4+2+3 /3)
and i want the standard deviation
1
0,577350269
2,081665999
can someone give me the code to do this? thank yo

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Image Analyst
Image Analyst 2012-11-28
Look at the second input argument of mean().

更多回答（1 个）

Mitch Martelli
Mitch Martelli 2012-11-28
Hi,
From your post i suppose that you would like the mean rows by rows, and you want the standard deviation columns by columns.
In litirature there is two different way to define the standard devaition.
So you can set the variable type to 0 if you want to normalize by (n-1) or you can set 1 if you would like to normalize by n.
See Matlab help or wikipedia for more information.
Example code :
data=[3 2 4
2 3 7
4 2 3 ];
mean_data=mean(data,2);
type=0;
std_data=std(data,type,1);
Best regards
M1tC4

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