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

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LuYao Guo
LuYao Guo 2021-2-17
评论： KALYAN ACHARJYA 2021-2-17
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.

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回答（1 个）

KALYAN ACHARJYA
KALYAN ACHARJYA 2021-2-17
Any issue?
data=readmatrix('test.txt');
Now Extract the clolumns as
data(:,2); % For 2nd Column
data(:,3); % For 3rd Column
....so on
plot(...)
  2 个评论
LuYao Guo
LuYao Guo 2021-2-17
Hi Sir, first of all, thank you for answering. Unfortunately I fail to use readmatrix. And I realize the last three columns involves 'E' '-' and time, are they the reasons causing the error?

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