Re: [Gnuplot-info] minor ticks on logaritmic axis

[Ethan M. <eam...@gm...>]

The issue of minor tics on a log scale axis has been problematic since the
origin of gnuplot, lost in the dim mists of time.  The oldest bug in the
tracker complains about this.  But over the last 10 years I have never seen
a coherent proposal about how the program could better handle a "set
mxtics" command in log-scale mode, let alone a patch that would implement
it.

IMHO the best thing is to treat "set/unset mxtics" in log scale mode as an
on/off operation only.  "on" means you get autogenerated minor tics, "off"
means you don't get any.

As John points out, you can generally set mxtics to 10.  That fixes some
odd corner cases when the total range on x is less than one decade, but can
introduce strangeness in other corner cases.


On Fri, Jun 6, 2014 at 2:19 PM, BBands <bb...@gm...> wrote:

> This seems correct to me.
>
> set logscale x
> set logscale y
> set xrang [1:100]
> set yrang [1:100]
> set mxtics 10
> set mytics 10
> set grid mxtics mytics
> plot "<echo '50 50'"
>
>     John
>
> On Fri, Jun 6, 2014 at 7:57 AM, Bo Jakobsen <li...@f7...> wrote:
> > Dear all
> >
> > I am trying to understand how gnuplot sets minor tics on a logaritmic
> > scale and if that is "correct"
> >
> > running the following minimal example:
> >
> > set logscale x
> > set xrang [10:100]
> > set yrang [1:10]
> > set mxtics 4
> > plot "<echo '50 1'"
> >
> > shows that minor tics are sat at  25,50, and 75
> >
> > The first interval represents a smaller linear range (10-25) whereas the
> > later 3 represents a range of 25.
> > It that what is expected for minor tics on a log scale.
> >
> > setting mxtics to 8 is even worse I now gets minor tics at: 12.5, 50,
> > 37.5 ...
> > in which the first interval only represents 2.5 on a linear scale, and
> > the minor tics seems totally out of place
> >
> > Does any one here know what is the correct way to put minor tics?
>
>
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