Read text file and load data to an array

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Thanh Cao
Thanh Cao 2018-5-8
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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回答（3 个）

Guillaume
Guillaume 2018-5-8
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'};
Ameer Hamza
Ameer Hamza 2018-5-8
编辑：Ameer Hamza 2018-5-8
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.
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Taylor Fulton
Taylor Fulton 2020-3-3
No. This spits out values that look nothing like any of the numbers in the text file.
Taylor Fulton
Taylor Fulton 2020-3-3
f = fopen('Class15_voltage');
data = textscan(f,'%s');
fclose(f);
variable = str2double(data{1}(2:2:end));
It functioned a moment ago but spat out numbers from kirby's dreamland. Now it just spits out errors.

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Thanh Cao
Thanh Cao 2018-5-8
Thank you Guillaume, this is awesome.

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