Unwanted line in on plot
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I have two arrays about x-axis and y-axis and plot(x,y) shows following graph.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/169949/image.jpeg)
After I combine two arrays into one by doing data=[x,y], plot(data) has strange brown diagonal line. X,Y axis is also changed.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/169951/image.jpeg)
How can I change second plot to original plot with combined array?
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Accepted Answer
Walter Roberson
on 21 Nov 2017
When you plot() an array that has two columns, that does not mean that the first column should be used for x and that the second column should be used for y. Instead what it means is the same as
plot(1:size(data,2), data(:,1), 1:size(data,2), data(:,2))
That is, each column is used as y coordinates the the x coordinate is the row number. One line is plotted per column.
3 Comments
Walter Roberson
on 21 Nov 2017
Edited: Walter Roberson
on 21 Nov 2017
MATLAB automatically uses the next available colors when you plot multiple lines. It looks to me as if that line corresponds to your second column of data.
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