[Kst] Prune data to visible range

[Barth Netterfield]

Let me make sure I understand this:

(2) is a plot tool which, for example could be:
plotRBM->prune to visible range (or some better name)

which would set the vector range of all tied plots to the range displayed in 
the plot.

The logic could be: 
go through each vector in each displayed curve in a tied plot
  -find the index of the first XY pair which is in the plot: f0
  -find the index of the last XY pair which is in the plot: f1
Set the new vector range accordingly.

Notes: 
  -we need to keep different indices for each data source.
  -If the curves are not monotonic, we might still read samples that are not 
displayed, but we will for sure read all samples that are displayed.
  -using the tied zoom system lets us select which vectors we trim at the cost 
of some decreased convenience.

If this is what you mean, then I think it is a very good idea.  I would be 
happy to put it on my short list....

cbn

On September 17, 2014 01:42:39 PM Brisset, Nicolas wrote:

> Hi,
> 
> As already mentioned in the past on this list, I think it is currently a bit
> too cumbersome to reduce vector ranges. We also had quite a few user
> requests which went in that direction. So I'd like that to improve :)
> 
> I see 2 ways:
> 
> 1.       Arrange for the change data sample ranges tool to allow entering
> ranges more efficiently than by means of numbers (e.g. using time or
> date/time, which I think more or less exists but I can't get it to work)
> 
> 2.       Adding a tool to prune vectors according to the range of a given
> vector (typically time). We could for instance integrate it in the "Change
> Data Sample Ranges" tool, and it would principally do the following:
> 
> §  Check all tabs/plots/curves using the selected vector(s) to determine the
> min and max frames displayed, assuming the vector(s) is(are) monotonous
> 
> §  Set the ranges of all visible vectors (i.e. vectors used in at least one
> curve) to the previously determined min and max frame range
> 
> Considering that Kst can display pretty much anything as a function of
> something else, the previous description is a bit abstract. But if you
> consider the very usual case of displaying vectors from a time series, it
> would be very easy to use as it is much easier to determine an interesting
> range visually than over frame ranges. Concretely, you would zoom into the
> interesting range on one f(t) plot, go to the range tool, select the time
> vector and hit a button, and everything would be settled.
> 
> The only thing is that I'm not too much into the plotting part of Kst, so
> I'd appreciate some guidance  on how to go about it (especially how to
> efficiently iterate over plots and get the min and max frame numbers or
> values of a given vector)
> 
> Thanks for your help,
> 
> Nicolas
> 
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-- 
C. Barth Netterfield
416-845-0946