# 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.

Danny Van Elsen on 6 Oct 2019
ah, yes, I see.
ylim([-10 10])
xlim([-10 10])
gives other results
Star Strider on 6 Oct 2019
You never mentioned that you just wanted to limit the axes ranges.

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 .
(Also, the plot is not empty when I plot it.)
##### 2 CommentsShowHide 1 older comment
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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