Statistics Reloaded.

[Tomaz Canabrava]

So, I'm a few days trying to create the visualizariojs for the statistics.
I tried with qwt and qtcharts but I didn't managed to have anything that I
liked, so I started today getting rid of it and actually using the same
code that I did for the profile.

This way I can Taylor for what I want instead of being locked In the
ugliness of qwt of the lack of options for qt charts.

Currently in the qt charts branch I can plot correct data generating an
incorrect graph

And I can plot the coordinate system but no data yet on the profile based
chart library.

It was good to see that I managed to create an actual good library for the
profile that I could detach and use for other unrelated graphs with minimal
modifications.

Today I'll probably be able to present something worth of your time.



On Wed 19. Jul 2017 at 21:34, Willem Ferguson <
willemferguson at zoology.up.ac.za> wrote:

> On 19/07/2017 18:45, Tomaz Canabrava wrote:
> > Hey people,
> >
> > I'll have one week to work on subsurface because of Akademy, without
> > work or wife interference :)
> > So I really think I'll be able to do something good there.
> >
> > About the mockups - they are good for desktop but they don't take into
> > account mobile.
> > but I'll try to do that.
> >
> > Tomaz
> Tomaz,
> That would be great. There is one issue we discussed that was not
> finalised, the number of bars in each of the histograms. You could
> initially use a fixed scheme and I or someone else could adapt it
> afterwards to be more flexible without UI intervention. Alternatively,
> here is a (sort of) algorithm that is likely to work to calculate the
> number of bars. Maybe you have your own ideas, then please ignore all of
> this.
>
> # For each histogram:
> # -------------------
> binvalue = {1.0, 2.0, 2.5, 5.0, 10.0, 20.0}
> Find minimum and maximum values of data to be graphed
> range = maximum-minimum
> BinSize = binvalue with size just > (range/10)
> # e.g. if (range/10 == 3) then BinSize = 5;
> # with our testdata (range/10=5.6969) then BinSize=10
> Startvalue = largest multiple of BinSize just < minimum
>
> In case that my help you, I attach a LibreOffice spreadsheet that uses
> this algorithm on a dataset of 54 values (the blue column).
> Ignore the multiplier value. A histogram (red bars) representing these
> values is also shown. Unfortunately LibreOffice does not place the
> numbers below the graph in the correct places.
> Basically this uses part of the calculations one would do anyway to draw
> a histogram. Only difference is that we dynamically determine BinSize
> and Startvalue based on the chracteristics of the data.
> I attach an image if what that histogram should look like if all labels
> were written correctly. The bars can be wider and touching or narrower
> like in the attached jpg file. I personally prefer wider bars.
>
> I hope this is understandable.
>
> Kind regards,
> willem
>
>
>
>
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