MATLAB: Trouble with declaring function output

Question

I created a function for importing data from text files, and then outputting an array of the averages of these data.

data = function importer
files = dir('*.txt');
for i = 1:length(files)
    temp = importdata(files(i).name);
    radData = temp.data(:,4);
    radAvg = mean(radData(~radData==0));
    data{i} = radAvg;
end
end

When I run the code however, I get the error

Error: File: importer.m Line: 1 Column: 8
Function definitions are not permitted in this context.

However, defining the function simply as

function importer

and then displaying the final array at the end of the code

...
end
data
end

shows that my code works otherwise. I am not sure what I did wrong but any help would be greatly appreciated.

Answer 1

function data = importer