Read text file and load data to an array

Question

Thanh Cao 2018-5-8

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https://ww2.mathworks.cn/matlabcentral/answers/399760-read-text-file-and-load-data-to-an-array

评论： Taylor Fulton 2020-3-3

I have a text file contains a variable name and value as showed

variable1 0.00069444
variable2 1440.00
variable3 7200.00
variable4 0.90
variable5 -2.00
variable6 -10.00
variable7 0.0002
variable8 0.00
variable9 90.00

I would like to read this text file and store into an array, for example

A = variable1 0.00069444
    variable2 1440.00
    variable3 7200.00
    variable4 0.90
    variable5 -2.00
    variable6 -10.00
    variable7 0.0002
    variable8 0.00
    variable9 90.00

Thanks for your help

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Answer 1

Guillaume 2018-5-8

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在 MATLAB Online 中打开

A lot simpler

t = readtable('C:\somewhere\somefile.ext', 'ReadVariableNames', false);

that's it. However, I'd then give the column some meaningful names, e.g.:

t.Properties.VariableNames = {'Name', 'Value'};

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Answer 2

Ameer Hamza 2018-5-8

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https://ww2.mathworks.cn/matlabcentral/answers/399760-read-text-file-and-load-data-to-an-array#answer_319298

编辑：Ameer Hamza 2018-5-8

在 MATLAB Online 中打开

If you just want to read the text, then run

data = fileread(filename);

But if you want to extract numeric data, the following code will extract it save it into an array

f = fopen(filename);
data = textscan(f,'%s');
fclose(f);
variable = str2double(data{1}(2:2:end));

instead of accessing it like variable1, variable2,... You can access by using indexing like variable(1), variable(2), .... The array style is MATLAB recommended style and is also much better as compared to giving a different name to each variable.