Read data from file

Question

Ivan Volodin 2018-3-15

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/388491-read-data-from-file

评论： KL 2018-3-15

whole res.txt

Hello!

I was not sure which title fits better in my case so I just left it to be written in the most general way. I have the file with following structure:

Step 1
10190103    
10145140    
10097524    
10050153    
10003042    
95795131E-02
91610140E-02
Step 2
81189385E-02
75561813E-02
80424136E-02
10000000    
10000000    
80617628E-02
77829769E-02
...
Step N
10000000    
10000000    
93788019E-02
11977901    
12290157    
12588248    
12861508

And I need to read it from N arrays, so

V1 = [0.10190103    
10145140    
10097524    
10050153    
10003042    
95795131E-02
91610140E-02]
V2 = [9.81189385E-02
75561813E-02
80424136E-02
10000000    
10000000    
80617628E-02
77829769E-02]
VN = [0.10000000    
10000000    
93788019E-02
11977901    
12290157    
12588248    
12861508]

I have read some examples to read data into arrays, but have not got something related to my case...

Can someone help me please..?

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KL 2018-3-15

Please attach your sample file using the paperclip icon.

Ivan Volodin 2018-3-15

编辑：Ivan Volodin 2018-3-15

Sure, please see it in attach.

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Answer 1

KL 2018-3-15

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/388491-read-data-from-file#answer_310185

编辑：KL 2018-3-15

Something quick,

d = readtable('whole res.txt');
d = table2cell(d);  
d = regexprep(d,' ','');
d = cellfun(@str2double,d,'uni',0);
d(cellfun(@isnan,d)) = [];
d = reshape(cell2mat(d),12,[]);

I reckon there should be faster ways. Even using one for loop right after readtable to combine all operations inside the for-loop step should also be more efficient than this. Nevertheless, this should work.

P.S: saving multiple variables (as you mentioned in your question) is not a good idea, use a matrix instead. If some of the columns have lesser rows, use a cell array.

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Ivan Volodin 2018-3-15

Thank you for your answer, but how it is going to work in my case if readtable fails, because "All lines of a text file must have the same number of delimiters" ..?

KL 2018-3-15

Where do you get these files from? A lot can be easier if the files are exported properly (with proper delimiters and using numbers instead of strings)

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