Extract, save, plot three specific columns from huge txt file

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LuYao Guo
LuYao Guo on 17 Feb 2021
Commented: KALYAN ACHARJYA on 17 Feb 2021
Hi,
I meet a problem about extracting columns from a huge txt file, and what I want is using textscan to extract column 1, 3 and 8 as a new txt file. Then I try to plot them in subplot, the column 1 as x axis and column 3 and 8 become y1 and y2. However, I ended up with error:
Index in position 1 exceeds array bounds (must not exceed 1)
I understand that Matlab treat the whole file as one column, anyone could help me with some codes please? Thank you very much.

Answers (1)

KALYAN ACHARJYA
KALYAN ACHARJYA on 17 Feb 2021
Any issue?
data=readmatrix('test.txt');
Now Extract the clolumns as
data(:,2); % For 2nd Column
data(:,3); % For 3rd Column
....so on
plot(...)
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