for loop and "importdata" function

2012 8 8
2 个回答
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Hi. I hope some of you have time to help me with this one: I am trying to import some ascii-files with a 5 line header plus tab-separated numbers. I want to sum the tab-separated numbers only, and I have 200 files. The code I have written is:
clear;
files = dir('H:\testmappe_sletmig');
for i=1:length(files)
data = importdata(files(i).name, '\t', 6);
summarise = sum(data(:));
end
xlswrite(summarise_fetch,summarise);
However, I get an error message saying
"Error using importdata (line 215)
Unable to load file.
Use TEXTSCAN or FREAD for more complex formats.
Error in extractsum (line 8)
data = importdata(files(i).name, '\t', 6);
Caused by:
Error using fileread (line 27)
Could not open file .. Invalid argument."
Any help is much appreciated!

4 个评论
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Oleg Komarov
Oleg Komarov 2012-8-8
Is the file damaged or protected?
A Westergaard
A Westergaard 2012-8-8
No, the file is not damaged or write protected. Thanks
per isakson
per isakson 2012-8-9
Can you import the files interactively with the Import Wizard? The [Import Data] button in the Workspace toolbar.
A Westergaard
A Westergaard 2012-8-9
编辑：A Westergaard 2012-8-9
Hi. Yes, I can import them manually by choosing "Import Data", either from Matlabs browser (right-click file -> Import Data) or with the Import Data button in the Workspace toolbar. The wizard automatically detects the header (5 lines) and the tab-separated data. The result is a textdata-matrix (with header info) and a data-matrix (with the actual data). Thanks

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 采纳的回答

A Westergaard
A Westergaard 2012-8-9

0 个投票

Ah, here we go. Problem solved!
clear;
files = dir('H:\testmappe_sletmig\*.txt');
for i=1:length(files)
eval(['x = importdata(files(i).name)']);
summarise(i) = sum(x.data(:));
end
xlswrite('summarise_fetch',summarise);

更多回答（1 个）

A Westergaard
A Westergaard 2012-8-9

0 个投票

Thank you for your inputs. I managed to get it working, however one challenge remains: I would like to export the sum of the data matrices to excel, so the sum of each input file is stored in a corresponding cell in an excel-sheet. When I use the code below, the sum of all the input files are stored in a single cell.
clear;
files = dir('H:\testmappe_sletmig\*.txt');
for i=1:length(files)
eval(['x=importdata(files(i).name)']);
summarise = sum(x.data(:));
end
xlswrite('summarise_fetch',summarise);

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