()-indexing must appear last in an index expression

I have a 70x70x328 matrix and want to take the mean along either the first or second dimension (they're the same) while ignoring elements that are 0. I'm getting the error: ()-indexing must appear last in an index expression but don't know how to rearrange or what to add to my expression. Here's what I have

for i=1:length(files)
    Mean1(:,i)=mean(All_files(:,:,i)(All_files(:,:,i)~=0),2);
end

Thanks!

Answer 1

[Andrei Bobrov]

EDIT

Mean1 = squeeze(sum(data)./sum(data~=0))%first dimension  
Mean2 = squeeze(sum(data,2)./sum(data~=0,2))%second dimension

Answer 2

[Image Analyst]

See if this works for you:

m = randi(9, [70,70,328])-1; % 70x70x328
sumAlongDim2 = squeeze(sum(m, 2)); % 70x328
binaryVolume = m ~= 0; % 70x70x328
countAlongDim2 = squeeze(sum(binaryVolume, 2)); % 70x328
% Compute the average.
meanAlongDim2 = sumAlongDim2 ./ countAlongDim2;
imagesc(meanAlongDim2);