plotting two parametric functions in same figure
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Danny Van Elsen
on 6 Oct 2019
Commented: Star Strider
on 6 Oct 2019
I was trying to plot a parametric function, and its inverse, like this:
t= linspace (-30, +30);
x= t;
y= (t.^5) + t + 1;
plot(x,y)
hold on
% t= linspace (-30, +30); <-- no difference
xx= (t.^5) + t + 1;
yy= t;
plot(xx,yy)
but this gives an empty plot, just showing axes with a far larger range than -30:30
what would I be doing wrong?
regards,D.
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Star Strider
on 6 Oct 2019
You are not doing anything wrong, you are simply misinterpreting the results. The first function would plot with ‘t’ on the x-axis, going from (-30,30). The second function does the reverse of this, and so the plot adapts to the largest range on both axes, going from
to
.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/241346/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/241347/image.png)
(Also, the plot is not empty when I plot it.)
2 Comments
Star Strider
on 6 Oct 2019
Danny Van Elsen‘s Answer moved here —
thank you for your response!
but my output is consistently empty:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/241352/image.png)
I get the expected result when entering either of the two functions alone, but nothing when entering both?
regards, D.
Star Strider
on 6 Oct 2019
My pleasure!
It is not empty. It shows the two functions crossing each other. The lines are not the plot axes. The blue line is the plot of (x,y), and the red line is the plot of (xx,yy).
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