Unwanted line in on plot

2017 11 21
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更新时间：2017 11 21
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I have two arrays about x-axis and y-axis and plot(x,y) shows following graph.
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.
How can I change second plot to original plot with combined array?

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Walter Roberson
Walter Roberson 2017-11-21

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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.

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Gyeongtae
Gyeongtae 2017-11-21
thank you. I thought first column of array should be x and second column be y. Then could you what causes the unwanted brown line on plot?
Walter Roberson
Walter Roberson 2017-11-21
编辑：Walter Roberson 2017-11-21
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.
Gyeongtae
Gyeongtae 2017-11-21
Yes. You're right. The linear-like graph is come from second column. I understand! Thank you Walter :)

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