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How to specify same positive and negative axes-limits without knowing the limit values beforehand?

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Siddharth Kabra
Siddharth Kabra 2018-2-18
回答： Chris Wilkening 2024-5-9
Is there some way we can specify the axes to have uniform limits on positive and negative side without knowledge of the limits themselves. I am generating several figures at once with multiple subplots in each figure, and my x-axis limits range from [-4 3] for one subplot to [-25 20] for another subplot. I want each subplot to have same limits on both sides of zero, i.e. they should adjust to [-4 4] and [-25 25] on their own, especially since I don't know the actual values until the graphs are plotted. It is impractical for me to do this for each figure and subplot with the number I generate. Keep in mind that I do not want all my subplots to have the same limits as each other, just the same positive and negative limits. This is urgent and any help is much appreciated.

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回答（2 个）

David Goodmanson
David Goodmanson 2018-2-20
编辑：David Goodmanson 2018-2-20
Hi Siddharth,
Here is the simplest way, which assumes that the elements in the x array are all increasing or all decreasing, as usual. You can experiment around with the factor of 1.1; a factor of 1 works all right too.
There is a more complicated way that finds the limits set by plot and adjusts those. You get slightly better looking graph limits sometimes, but I don't know that the added complication is worth it.
x = -4:.01:14.1;
y = cos(x);
figure(1)
plot(x,y)
maxlim = max(abs([x(1) x(end)]))
xlim(1.1*[-maxlim maxlim])
Chris Wilkening
Chris Wilkening 2024-5-9
Seems like this should be an option but below works
x = -4:.01:14.1;
y = cos(x);
figure(1)
plot(x,y)
xlim([-max(abs(xlim)), max(abs(xlim))])
ylim([-max(abs(ylim)), max(abs(ylim))])

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