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importing a column of data from a text file

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Siddharth
Siddharth 2013-5-29
关闭： MATLAB Answer Bot 2021-8-20
i need to import a particular column of data from a text file. the columns are differentiated by the size of the numbers. For example :
20 30000
21 40000
24 50000
how can i do so?

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回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-5-29
编辑：Azzi Abdelmalek 2013-5-29
Import the data using
data=dlmread('yourfilename.txt')
Then choose the column you want
data(:,2)
% You can get the sizes of numbers in each column
numbers=arrayfun(@(x) numel(num2str(x)),data(1,:))
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Azzi Abdelmalek
Azzi Abdelmalek 2013-5-29
编辑：Azzi Abdelmalek 2013-5-29
data=dlmread('yourfilename.txt')
numbers=arrayfun(@(x) numel(num2str(x)),data(1,:))
[idx,idx]=max(numbers)
result=data(:,idx)
Azzi Abdelmalek
Azzi Abdelmalek 2013-5-29
or simply
data=dlmread('yourfilename.txt')
[idx,idx]=max(data(1,:))
result=data(:,idx)
Andrei Bobrov
Andrei Bobrov 2013-5-29
编辑：Andrei Bobrov 2013-5-29
d = dlmread('yourtxtfile.txt');
[k,k] = max(log10(d(1,:)));
out = d(:,k);
or
[k,k] = max(log10(d(:)));
out = d(:,ceil(k/size(d,1)))

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