> Ahem. We've found that the real issue lies with the fact that that
> the required graph is a *two-cycle* log on the x axis. This appears
> to involve a change of scale (i.e. log formula) halfway along the x
> axis, effectively the same as abutting two distinct charts, but with
> rigid controls on the physical dimensions and ranges of scale
> values used for each demi-chart.
>
> More checks are in order (because I really don't yet understand the
> implications of "one cycle" vs. "two cycle" in the log chart world),
> but that appears to be the gist of the real problem, and not
> something that TeeChart can do directly for us. In contrast, doing a
> simple log(x), linear(y) chart in TeeChart is as easy as the
> proverbial.
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] ...
FWIW
-ns
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