plotting two parametric functions in same figure

Question

Danny Van Elsen 2019-10-6

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https://ww2.mathworks.cn/matlabcentral/answers/483828-plotting-two-parametric-functions-in-same-figure

评论： Star Strider 2019-10-6

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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Answer 1

Danny Van Elsen 2019-10-6

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https://ww2.mathworks.cn/matlabcentral/answers/483828-plotting-two-parametric-functions-in-same-figure#answer_395003

ah, yes, I see.

adding

ylim([-10 10])

xlim([-10 10])

gives other results

thanks for your patience there...

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Star Strider 2019-10-6

You never mentioned that you just wanted to limit the axes ranges.

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Answer 2

Star Strider 2019-10-6

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https://ww2.mathworks.cn/matlabcentral/answers/483828-plotting-two-parametric-functions-in-same-figure#answer_394996

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.)

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Star Strider 2019-10-6

Danny Van Elsen‘s Answer moved here —

thank you for your response!

but my output is consistently empty:

I get the expected result when entering either of the two functions alone, but nothing when entering both?

regards, D.

Star Strider 2019-10-6

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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