Using loops how would I take the mean of 3 values within each row?

Im given a matrix similar to this but longer. I ignore the nan values when calculating the average. The problem I have is that my output is only the last rows average and I want each row to provide me with a separate average.

Let me know if I should clarify more!

shortmeasurements = [ 300 301 303;

 301 302 nan;

 304 307 306;

 nan 303 306;

nan 301 nan;]

I think I'm getting an error from my "mean" line. "Tube" represents the n-by-3 matrix I'm taking the average of.

failcount = 0; %//initialize variables
flag = false;


for n = (1:size(Tube,1)) %//number of elements in first row
    if all(isnan((Tube(1,:))))== 1 %// if all values in row 1 are NaN
        failcount = failcount + 1; %//fail count + 1

        if failcount == 1 %//first time through loop
            airSpeed = isnan; %//airspeed nan
        else 
            airSpeed(n,1) = (airSpeed( n-1,1)) %//previous air speed
        end
    else
        airSpeed = mean(Tube(n,~isnan(Tube(n,:)))); %//taking the mean