R help - Jan 2010 - How to apply a function on each column of a matrix

Hello everyone, I get for each date a measure for n elements in the form of a
matrix. I am converting it to a ts object using ts(). I want to apply a
function on each column. I started using the apply function ( set to 2) but
what it returns is a matrix with the same columns representing the function
applied on the last column of the initial matrix. I have been trying to use
the sapply function or an apply in an apply but didn't get it to work the
way I wanted. Have anyone any idea about it?

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Here is the last code that I wrote but it would give me the same problem:
I have the matrix mat with n columns mat.1, mat.2 ...mat.n

#To be able to use lapply I convert it to a data.frame: 
mat <- data.frame(mat)

lapply(mat, function, argument of function)

It works but I still get for all elements the function applied for the last
element. The elements of my results are all the same I don't understand I
did exactly as shown on this website: 
http://www.ats.ucla.edu/stat/r/library/advanced_function_r.htm#lapply
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