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tick formatter pi cause the plot of squared sine function to have long tick label

asked 2022-05-24 17:26:25 +0100

Martine gravatar image

updated 2022-05-25 04:56:31 +0100

sage: plot(sin(x)^2)

This is normal. but if you use the below code:

sage: plot(sin(x)^2, tick_formatter=pi)

You will get very long y axis tick labels.

The version of sagemath is 9.6-2, from arch linux package repository.

edit: tick_formatter=[pi, None] will give the normal result, but according to the documentation of Graphics objects, about tick_formatter:

If the value of this keyword is a single item, then this will give the formatting for the horizontal axis only (except for the "latex" option).

So my code should work, but it did not work.

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the version of sagemath is 9.6-2, from archlinux package repository

Martine gravatar imageMartine ( 2022-05-24 17:27:03 +0100 )edit

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answered 2022-05-24 18:56:32 +0100

eric_g gravatar image

Instead of tick_formatter=pi, you can use tick_formatter=(pi, None); this specifies that the pi tick formatter is only for the x-axis, the y-axis keeping the default formatter (this is what you want, I guess). This produces the correct output, without any long y-axis tick label.

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Thank you for quick replying! Although this solution works, according to the https://doc.sagemath.org/html/en/reference/plotting/sage/plot/graphics.html?highlight=tick_formatter#sage.plot.graphics.Graphics.show (documentation) of tick_formatter, If the value of this keyword is a single item, then this will give the formatting for the horizontal axis only. So I think it may be a bug?

Martine gravatar imageMartine ( 2022-05-25 04:47:25 +0100 )edit

You are right: it's a bug. It seems to be related to https://trac.sagemath.org/ticket/15776.

eric_g gravatar imageeric_g ( 2022-05-26 12:03:14 +0100 )edit

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Asked: 2022-05-24 17:19:11 +0100

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Last updated: May 25 '22