Taking the mean of a matrix with NaN's in Matlab [duplicate]

Question

Possible Duplicate:
Dealing with NaN’s in matlab functions

Is there a one line command that allows you to take the elementwise average of a matrix (ignoring NaN's) in Matlab? For example,

>> A = [1 0 NaN; 0 3 4; 0 NaN 2]

A =

     1     0   NaN
     0     3     4
     0   NaN     2

So the mean(A) should equal (1+3+2+4+0+0+0)/7 = 1.4286

Also, I don't have access to the stats toolbox so I cannot use nanmean()

Answer 1

You can use isnan() to filter out the unwanted elements:

mean(A(~isnan(A)))

Answer 2

nanmean

Performs just like mean, but ignoring nans.

For example:

>> A = [1 0 NaN; 0 3 4; 0 NaN 2]
A =
     1     0   NaN
     0     3     4
     0   NaN     2
>> nanmean(A)
ans =
         0.333333333333333                       1.5                         3
>> nanmean(A,2)
ans =
                       0.5
          2.33333333333333
                         1
>> nanmean(A(:))
ans =
          1.42857142857143