plot - strange behaviour for big numbers

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Grzegorz Knor 2016-11-10

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https://ww2.mathworks.cn/matlabcentral/answers/311564-plot-strange-behaviour-for-big-numbers

评论： Grzegorz Knor 2016-11-14

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I've found a strange behavior of plot function in MATLAB 2015b (Windows 7). Namely this code:

plot([1,1],[1e+19,100])

produces line from 1e+19 to 100. But if I zoom it by dint of command:

xlim([0, 2])
ylim([-10, 110])

I obtain the following figure:

After changing y axis limits:

ylim([-10 1200])

Everything is OK:

I cannot (fortunately) reproduce it in MATLAB 2012b. Do you have any idea what happens?

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Grzegorz Knor 2016-11-11

Generally, I plot a data (with outliers like 1e+19), so to see an interesting region I use ylim command. I've noticed this strange behavior, when I used a function for conditionally colored line plot . The result was odd, and I found how to reporduce it, so this is an explanation of the simple code in my question :)

I will try use other render options as soon as I will have access to the MATLAB.

Grzegorz Knor 2016-11-14