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anonymous
 5 years ago
If I have a matrix of values. How do I get the mean of all this values?
anonymous
 5 years ago
If I have a matrix of values. How do I get the mean of all this values?

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dumbcow
 5 years ago
Best ResponseYou've already chosen the best response.0add them up and then divide by m*n where m and n are dimensions of matrix

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Yeah I have this in mind, I just wanted to know if there is a mathematical tool that makes that for me. lol. Thanks dumbcow

dumbcow
 5 years ago
Best ResponseYou've already chosen the best response.0haha there might be, i dont know

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0by the way, do you know what variance and covariance means. I mean, what is its physical meaning ...

dumbcow
 5 years ago
Best ResponseYou've already chosen the best response.0what do you mean by physical meaning?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0I dont know how to say that, but, what I want to know is what is the they represent if I get the covariance, the variance, or even the eigenvectors. I know how to get them but I dont know what information they bring. For example if I derivate a function, I know that what im getting is the slope; in the same way, if I integrate, I know that Im calculation the area under the curve. Does it make sense?

dumbcow
 5 years ago
Best ResponseYou've already chosen the best response.0yes the variance tells you how spread out the data is or how far away you get from the mean covariance tells you how closely related 2 dependent variables are, if 2 variables are independent then they have a covariance of 0 high covariance means high dependence

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Got it! what about eigenvectors and eigenvalues?

dumbcow
 5 years ago
Best ResponseYou've already chosen the best response.0its been awhile, im not as good at explaining those this might help http://en.wikipedia.org/wiki/Eigenvector
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