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

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SimTec
SimTec 2021-6-23
评论： Walter Roberson 2021-6-23
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.

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KSSV
KSSV 2021-6-23
编辑：KSSV 2021-6-23
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')
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Walter Roberson
Walter Roberson 2021-6-23
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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