Open multiple .WTD files and create a matrix to perform calculation

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Damith
Damith 2014-4-23
编辑： Damith 2014-4-24
Hi,
I have 39 .wtd files (see a sample of attached file) and need to read the 1st and 4th columns. Then I need to create a data matrix [0001(:,4) 0002(:,4)...0039(:,4)]. Please help me to create this.
See the 0001.wtd attached.
Thanks for any help in advance.
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Star Strider
Star Strider 2014-4-24
编辑：Star Strider 2014-4-24
I unzipped it to a ‘.wtd’ file, and then couldn’t find an application that would read it. What is it? I suggest you open it and save it as a PDF, then upload the PDF version.
How do you open it in MATLAB? Does it require a specific Toolbox?
Posting the relevant section of code that opens it would help.
Walter Roberson
Walter Roberson 2014-4-24
The file is a text file; for example on OS-X I can open it with Text Wrangler without difficulty.

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回答（1 个）

Walter Roberson
Walter Roberson 2014-4-24
http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F
all_col1 = [];
all_col4 = [];
then start file loop, and for each
fid = fopen(filename_variable_goes_here, 'r');
col1_4_cell = textscan(fid, '%f%*f%*f%f', 'headerlines', 1, 'CollectOutput', 1);
col1_4 = col1_4_cell{1};
all_col1 = vertcat(all_col1, col1_4(:,1));
all_col4 = vertcat(all_col4, col1_4{:,2));
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Walter Roberson
Walter Roberson 2014-4-24
The line I posted has code outline of how to read a series of files.
all_col1 = [];
initializes a variable named "all_col1" to be the empty matrix. The vertcat() is then used to append information to the bottom of the matrix.
If you use the second batch of code in the link I posted above, the one that reads the file names out of the directory, then filename_variable_goes_here should be changed to fullFileName
Damith
Damith 2014-4-24
编辑：Damith 2014-4-24
I tried your code and all_col1 and all_col4 are empty. Here is the code I tried: I tried reading the attached 0001.wtd file.
all_col1 = []; all_col4 = [];
fid = fopen('0001.wtd', 'r');
col1_4_cell = textscan(fid, '%f%*f%*f%f', 'headerlines', 1,'CollectOutput', 1);
col1_4 = col1_4_cell{1};
all_col1 = vertcat(all_col1, col1_4(:,1)); all_col4 = vertcat(all_col4, col1_4(:,2));

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