Re: gnuplot algorithm to find axis spacing

[Daniel F. <boy...@gm...>]

Hi,

Thanks for the pointers. I have it all working now.

I have made an algorithm that 'links' x1 and x2 axis via a equation =20
(it actually just automate the set x2tics(...) function once the x1 =20
and a transformation equation are known.). It would be nice to =20
integrate my work with the gnuplot source when. However, I will now =20
have to learn about how gnuplot interprets equation; so that the user =20=

can link the axes, my code needs to be more general.

I'll post again about this subject after I've had a chance to read =20
some more source.

Cheers,

Daniel.

On 26 Nov 2006, at 21:36, Hans-Bernhard Br=F6ker wrote:

> Daniel Farrell wrote:
>
>> Where is this calculated in the code?
>
> src/axis.c: gen_tics and make_tics()
>
>> How does gnuplot calculate the step size between tic marks?
>
> Compute the length of the axis, find a tic size from the usual =20
> 1/2/5 times power-of-ten series that will create a "useful" number =20
> of tics (between 5 and 10) on that range.  Variations of this =20
> scheme are needed for logarithmic and time/date scales.
>
>