Why the imaginary part of the points p1,p2,p3 isn't zero in the plane?
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Giuseppe Alfieri
am 16 Jul. 2018
Kommentiert: Giuseppe Alfieri
am 16 Jul. 2018
p1=1;
p2=3;
p3=4;
plot([p1,p2,p3],'x')
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/191965/image.jpeg)
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Steven Lord
am 16 Jul. 2018
When called with one data input, the plot function behaves differently depending on whether that data input is real or complex. From the documentation:
"plot(Y) creates a 2-D line plot of the data in Y versus the index of each value.
If Y is a vector, then the x-axis scale ranges from 1 to length(Y).
...
If Y is complex, then the plot function plots the imaginary part of Y versus the real part of Y, such that plot(Y) is equivalent to plot(real(Y),imag(Y))."
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Jesus Sanchez
am 16 Jul. 2018
You are not plotting a Real vs Imag plot, but just the normal one. The 'x' makes the plotted data to be represented as an x marker, but that is all. When you execute that code, MATLAB shows the corresponding value in y-axis and the index of that value in x-axis. That is why your first value appears in the position "1" in x-axis, your second in "2" etc etc
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