ewnanmean(inputMat,​exponent,dim)

This function calculates the exponentially weighted nanmean for a matrix

If exponent > 0 it weights the values on lower indexes high, if exponent < 0 it weights the values on higher indexes high. If exponent == 0 this function is a slower version of nanmean.
Input:
inputMat - the matrix that we want to mean
exponent - how much to exponentially weight the answers, default 2
dim - which dimension to take the mean over, default first dimension

Output:
output - the mean not counting NaN values