for loop in a function

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Marco Yu
Marco Yu 2016-6-22
评论： Marco Yu 2016-6-22
%function [temp_finalmean]=first_difference_mean
%calculate the first difference between two column
files=dir('*.mat');
temp_save=zeros(30,359);
for m= 1:length(files)
load(files(m).name)
temp_temp=zeros(30,359);
temp_thickness=cell2mat(T(1,1));
temp_thickness=image2polar(temp_thickness,peaks(1,1)*200/668,peaks(2,1)*200/668,'counterclockwise',[],1,pi/180,'linear');
temp_size=size(temp_thickness);
temp_thickness(62:temp_size(1),:)=[];
temp_thickness(1:31,:)=[];
disp(['Loading ' num2str(m) ' files'])
for n=1:359
for k=1:30
temp_temp(k,n)=temp_thickness(k,n+1)-temp_thickness(k,n);
end
end
temp_save=temp_save+temp_temp;
end
temp_finalmean=temp_save/length(files);
end
If I remove the top line and bottom line(i.e. the function and end),then I will have my code run perfectly. I mean I can get different result from the same code, it is strange... Is it I can't use load() in a function or something happened?
Thank you

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Walter Roberson
Walter Roberson 2016-6-22
When you have end matching function then you are creating a static workspace where it is not permitted to "poof" variables into existence using eval() or assignin() or evalin() -- and so, indirectly, also not using load() or syms() . You should use the output form of load() and pull the required information out of the structure that is returned.
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Walter Roberson
Walter Roberson 2016-6-22
function temp_finalmean = first_difference_mean
%calculate the first difference between two column
files = dir('*.mat');
temp_save = zeros(30,359);
for m = 1 : length(files)
data = load(files(m).name); %*
temp_temp = zeros(30,359);
temp_thickness = cell2mat( data.T(1,1)); %*
temp_thickness = image2polar(temp_thickness, data.peaks(1,1)*200/668, data.peaks(2,1)*200/668, 'counterclockwise', [], 1, pi/180, 'linear'); %*
temp_size = size(temp_thickness);
temp_thickness(62:temp_size(1),:) = [];
temp_thickness(1:31,:) = [];
disp(['Loading ' num2str(m) ' files'])
temp_temp = diff( temp_thickness(1:30, 1:360), [], 2 );
temp_save = temp_save + temp_temp;
end
temp_finalmean = temp_save / length(files);
end
The lines marked with %* are the essential changes; the other changes are style or efficiency (replacing the double loop with a single diff)
Marco Yu
Marco Yu 2016-6-22
Thank you so much :D you are an expert

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