File .txt in MatLab

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Francesco
Francesco 2011-10-18
Hi guys,
I have a little problem in opening a file.txt in MatLab: the file contains a matrix structured with strings and numbers. I give you an exemple: let's say the file contains the following matrix 3x3
AAB 11 23
CC 5 40
DEF 54 4
I'd like to create a matrix "A" such that A(1,1) = AAB. To do this i use the command
test=fopen('filename.txt','r')
to import the file, and then
A=fscanf(test,'%s',[3,3])
to open the file, but this give me a problem: it doesn't return a 3x3 matrix.
How can i solve this problem? Thanks in advance

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回答（2 个）

Thomas
Thomas 2011-10-18
If my data is in the file new.txt
fid=fopen('new.txt');
C = textscan(fid, '%s %s %f32 %d8 %u %f %f %s %f');
fclose(fid);
C{1} % will give you the first column
>>C{1} ans = 'AB' 'CC' 'DEF'
C{2} % will give you the second column
>> C{2} ans = '11' '5' '54'
C{3} % will give you the third column
>> C{3}
ans =
23.00
40.00
4.00
Also you can always convert the data from cell to string or to num as you wish with the cell2mat, str2num etc commands..
Hope this helps
Laura Proctor
Laura Proctor 2011-10-18
The following code will create a cell array that does what you like. Since you have mixed data types in the file, a cell array is going to be your best bet for importing everything into one variable.
fid = fopen('test.txt','r');
A = textscan(fid,'%s %u %u','delimiter',' ');
fclose(fid);
A = [ A{:,1} num2cell(A{:,2}) num2cell(A{:,3}) ];
Note that if you want to get out the contents from the first cell, you must use the syntax A{1,1} rather than A(1,1). Type them both in and see the difference in the class type in the Workspace.

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