Re: [Gnuplot-info] tics, mtics, and logscale

[walter h. <wh...@bf...>]

Am 08.02.2012 03:01, schrieb Tait:
> 
> Consider the following:
> 
> reset
> unset key
> set xrange [2**4:2**8]
> set logscale x 2
> set grid xtics mxtics ytics
> set ytics 1
> set multiplot layout 5,2
>   set title 'default'; set mxtics 8; plot log(x)/log(2)
>   set title 'xtics, 8'; set xtics 4; set mxtics 8; plot log(x)/log(2)
>   set title 'xtics, 2'; set xtics 4; set mxtics 2; plot log(x)/log(2)
>   set title 'xtics, 3'; set xtics 4; set mxtics 3; plot log(x)/log(2)
>   set title 'xtics, 4'; set xtics 4; set mxtics 4; plot log(x)/log(2)
>   set title 'xtics, 5'; set xtics 4; set mxtics 5; plot log(x)/log(2)
>   set title 'xtics, 6'; set xtics 4; set mxtics 6; plot log(x)/log(2)
>   set title 'xtics, 7'; set xtics 4; set mxtics 7; plot log(x)/log(2)
>   set title 'xtics, 8'; set xtics 4; set mxtics 8; plot log(x)/log(2)
>   set title 'xtics, 9'; set xtics 4; set mxtics 9; plot log(x)/log(2)
> unset multiplot
> 
> It produces output like: http://i.imgur.com/AvUUZ.png
> 
> In the default plot, you can see the minor tics are spaced logarithmically,
> as one would expect. As soon as I set the xtics spacing explicitly,
> the mxtics lose their spacing.
> 
> But the oddity does not end there. The "xtics, 2" graph is probably
> expected. But then the behavior for powers-of-two mxtics is nothing like
> the expected logarithmic spacing (that works normally when xtics are not
> set explicitly). I can't explain the non-powers-of-two mxtics at all. It
> appears the spacing is uniform (not logarithmic), but different after
> the first xtic for some reason.
> 
> In any case, the help doesn't adequately explain what's happening here,
> and I'm sort of wondering if maybe there isn't a bug or two. Can anyone
> explain?
> 
> 
hello Tait,
thx for your report. It would help when you tell what version of gnuplot
you are using so developers can check that.

re,
 wh