Save lines from a text file

Question

Guido Pozzi 2019-10-21

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/486608-save-lines-from-a-text-file

回答： Stephan 2019-10-21

采纳的回答： Stephan

在 MATLAB Online 中打开

Hi.

I have a txt file that looks like this:

Darby George 166.2 
Helen Dee 143.5 
Giovanni Lupa 192.4 
Cat Donovan 215.1

How can I save each of these lines into a different string variable ? but without knowing how many lines the txt file has.

The answer from MATLAB should look like this

a=Darby George 166.2 
b=Helen Dee 143.5
c=Giovanni Lupa 192.4 
d=...
e=..

Thanks

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Ruger28 2019-10-21

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check out

fgetl

and use a while loop. You can read each line and store it away as needed until file is finished.

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Answer 1

Stephan 2019-10-21

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It is a bad idea to store the lines all in different variables - this point has been discussed here for many times... Use a table or a cell array and then take advantage of the many functions that will make life easier:

fileID = fopen('text.txt');
A =textscan(fileID, '%s %s %f');
fclose(fileID);
A = table(A{:},'VariableNames',{'Name','LastName','Score'});
A.LastName = string(A.LastName);
A.Name = string(A.Name)

I saved your data i a file named text.txt - the result of this code is:

A =
  4×3 table
       Name       LastName     Score
    __________    _________    _____
    "Darby"       "George"     166.2
    "Helen"       "Dee"        143.5
    "Giovanni"    "Lupa"       192.4
    "Cat"         "Donovan"    215.1

Believe me - this is what you want, if you only learn indexing included logical indexing:

>> A(A.Name=="Cat",:)
ans =
  1×3 table
    Name     LastName     Score
    _____    _________    _____
    "Cat"    "Donovan"    215.1
>> A.Name(A.LastName == "Lupa")
ans = 
    "Giovanni"
>> A.Name(A.LastName == "Dee")
ans = 
    "Helen"
>> A.Name(A.Score==143.5)
ans = 
    "Helen"