How to find the mean and leave out the zeros?

I've got a matrix with 4 numbers (38,46,47,,0). I want to find the mean for the numbers 38, 46 and 47. I want to leave out the zero in my commando

My code:

mean(Gemiddelde_Heuphoek{welke_pp} = mean(Gemiddelde_gewrichtshoek.Heuphoek.meting)
%the code on the right of the equal sign contains the 4 numbers. 
%the code on the left of the equal sign calculates the mean of the 4 numbers.

But I want to create a code who leaves out the zeros en calculates the mean for only the non-zero elements.

Answer 1

[Sean de Wolski]

 mnz = mean(nonzeros(x))

[Sam]

Thanks!

[Image Analyst]

Cool - I didn't know about the nonzeros functions.

[Pratyush Das]

Thanks a bunch

Answer 2

[Image Analyst]

Try this:

nonZeroIndexes = m ~= 0;  % m is your row vector array of numbers.
theMean = mean(m(nonZeroIndexes));

m(nonZeroIndexes) selects only the non-zero numbers and so only those numbers will be considered by the mean() function.