[Matplotlib-users] symlog iffy when range max is below 1e0=1

[Liang Wang]

It turns out for yscale, I need to use linthreshy not linthresh. Problem
solved.

On Tue, Sep 22, 2020 at 11:45 PM Liang Wang <frank0734 at gmail.com> wrote:

> Hi,
>
> I have a problem using 'symlog' when the range maximum is below 1e0=1.
> Perhaps I'm misusing it, possibly the linthresh option.
>
> Example notebook:
> https://gist.github.com/liangwang0734/fde9a033c3d8788075589e2f9fd87f0c
>
> Sample code:
> import numpy as np
> import matplotlib as mpl
> import matplotlib.pyplot as plt
>
> def test(start):
>     linthresh = 10**(start+1)
>     tmp = np.logspace(start, start + 3, 20)
>     tmp = np.hstack((-tmp[::-1], tmp))
>
>     fig, ax = plt.subplots()
>     ax.plot(tmp, marker='o')
>     ax.set_yscale('symlog', linthresh=linthresh)
>     ax1 = ax.twinx()
>     ax1.plot(tmp, c='orange', ls='--')
>
> test(0)  # OK, linear scale and symlog scale look different
> test(-3) # iffy, linear scale and symlog scale look the same
>
> [image: image.png]
>
> [image: image.png]
>
>
>
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