Beginner's Question: What is wrong with this function?

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Yun Inn 2012-7-10

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I am a beginner. Can someone tell me why the function won't work when I run:

[output]=XIOdicomread2('XIOM01.txt',110);

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function [Id]=XIOdicomread2(filename, SIMD)
%%%SIMD is the source to image distance.
importXIO(filename);
Id=data;
Id=double(Id);
f=100/SIMD;
if f<1
    Id=shrink(Id,f);
elseif f>1
    Id=expand(Id,f);
end
end
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Where 'importXIO' import .txt file to MATLAB:

function importXIO(fileToRead1)
%IMPORTFILE(FILETOREAD1)
%  Imports data from the specified file
%  FILETOREAD1:  file to read
%  Auto-generated by MATLAB on 22-Jun-2012 10:05:03
DELIMITER = ',';
HEADERLINES = 16;
% Import the file
newData1 = importdata(fileToRead1, DELIMITER, HEADERLINES);
% Create new variables in the base workspace from those fields.
vars = fieldnames(newData1);
for i = 1:length(vars)
    assignin('base', vars{i}, newData1.(vars{i}));
end