A problem caused by 'xlim' and 'axis equal'

Hello,

I could not figure this problem. If you run the following then you get an error message

clc;

x=linspace(0,2*pi,1000);y1=sin(x);y2=cos(x);

subplot(2,1,1)

plot(x,y1,'-k');

xlim([-inf inf]);

ylim([-inf inf]);

xlabel('x');ylabel('y1');

legend('Sin');

axis equal;

subplot(2,1,2)

plot(x,y2,'-k');

xlim([-inf inf]);

ylim([-inf inf]);

xlabel('x');ylabel('y2');

legend('Cos');

axis equal;

I do not get any error if I remove 'xlim','ylim' stuff or if, instead, I renove 'axis eqaul'. I need to keep everything. How can I solve this annoying issue?

Thanks in advance!

Babak

[Mathieu NOE]

This is the first I see that

xlim([-inf inf]);
ylim([-inf inf]);

why ???????

[Dyuman Joshi]

You have to provide atleast one finite value when using xlim and ylim.

And setting x and y limits to (-Inf, Inf) does not make sense (atleast to me).

What exactly do you want to do?

[Mohammad Shojaei Arani]

Thanks!

Now, I got the root of the problem.

I have to use xlim([-inf inf]) since I do not know, in advance, the size of my figure. At the same time

I want my x and y axes to be equal. I am making a matlab package and this is not about one or two figures

I want to make for myself. Therefpre, I do not know the limits and have to use xlim([-inf inf]).

So, how can I use xlim([-inf inf]) and axis equal at the same time?

Answer 1

[Dyuman Joshi]

"So, how can I use xlim([-inf inf]) and axis equal at the same time?"

You can not. As I said before, atleast 1 input value to xlim/ylim must be finite.

"I want my x and y axes to be equal. "

Then provide the same limits to both axes.

"Therefpre, I do not know the limits and have to use xlim([-inf inf])."

MATLAB will adjust the limits automatically according to the given data.

[Mohammad Shojaei Arani]

ok. thanks!

[Image Analyst]

To be explicit, just remove these lines entirely

xlim([-inf inf]);
ylim([-inf inf]);

and MATLAB will decide on "nice" limits to use automatically.

[Mohammad Shojaei Arani]

ok. thaks!