how to plot column vs column from csv file using readmatrix?

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SimTec
SimTec on 23 Jun 2021
Commented: Walter Roberson on 23 Jun 2021
I have a csv file that is named data,that contains 03 columns: clock,volt_a and volt_b:
array=readmatrix('data.csv');
plot(array)
when I readmatrix the csv file, it shows the data without its column's name.

Accepted Answer

KSSV
KSSV on 23 Jun 2021
Edited: KSSV on 23 Jun 2021
You need to specify the column which you want. Read about MATLAB indexing.
array=readmatrix('data.csv');
plot(array(:,1),array(:,2),'r',array(:,1),array(:,3),'b')
legend('col2','col3')
OR
array=readmatrix('data.csv');
plot(array(:,1),array(:,2),'r')
hold on
plot(array(:,1),array(:,3),'b')
legend('col2','col3')
  3 Comments
Walter Roberson
Walter Roberson on 23 Jun 2021
array=readmatrix('data.csv');
plot(array(:,1),array(:,2:3))
legend('col2','col3')
would not allow you to choose line colors without a slight bit further work, but is often good enough.

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