If you plot a scale log 10 scale, and plot vertical lines at 1cm intervals,
then you get on one axis (X or Y).
10^0 = 1 = 1cm
10^1 = 10 = 2cm
10^2 = 100 = 3cm
10^3 = 1000 = 4cm
So the first line covers 1-9 and takes 1cm, the second covers 10-99 and
takes 1cm and the 3rd covers 100-999 and covers 1cm.
The spacing of the lines is the same, but the value they represent is quite
different.
The only reason you normally plot on log scales is to make a line straight,
as the data you are plotting represents a log n function, that would
otherwise if plotted on a non-log graph would be very curved.
But from what you are saying, It sounds like you are talking about something
different again??
Almost sounds like you have two different sets of data intermingled and are
trying to plot them on the same scale.
Do you actually need two x-axes?? Each a different scale??
Myles.
-----Original Message-----
From: Peter Hyde [mailto:[EMAIL PROTECTED]]
Sent: Monday, 6 August 2001 1:03 p.m.
To: Multiple recipients of list delphi
Subject: Re: [DUG]: "semilog" graphs
Nello wrote:
> As I understand it, each "cycle" of a log scale is like the previous
> cycle, but differs by a factor of the base of the logs you're using
> (10 or e usually).
>
> So for example, if base 10 logs, the first cycle will cover the interval
> [1,10) then 2nd cycle will be geometrically identical to the
> first (i.e. the spacing of the lines the same) but covers the
> interval [10,100]. And it naturally continues on this way in
> powers of the base [100,1000), [1000,10000] ...
Hmmm. For the life of me I can't see how this would alter the
physical scale of the X axis. That is, at one level it sounds to me
like "the x axis is a consistent log scale running up to 100, as
opposed to, say, stopping at 10". Yet the problem description we
now have sounds like "the x axis is two independent log scales,
covering different parts of the x world, with different scaling".
It's bridging that gap in understanding that I'm having troubles
with...
cheers,
peter
============================================
Peter Hyde, SPIS Ltd & WebCentre Ltd , Christchurch, New Zealand
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