Re: [Kmatplot-general] Nice work, comments, suggestions, questions

[Kamil D. <kam...@in...>]

Hi,
My mail server was unmasked as an open-relay so I was unable to post to the 
mailling list and you server rejected my mail too, because my hostname is 
localhost@localdomain. Uff now I'm trying to post using a different account. 

> Hallo Kamil and all the others,
>
> I recently installed kmatplot-0.3.1, and I really like it. SuSe is
> now distributing binaries for Suse7.3 on their homepage
> ftp://ftp.suse.com/pub/suse/i386/supplementary/KDE/update_for_7.3/applicati
> ons/kmatplot-0.3.1-6.rpm
> Of course, version number and Suse version number may change.

Thanks . I'll put a link to Suse packages on the KMatplot www page.  Now we
have binary packages for RH, Debian and Suse.

> Very nice work, I like to encourage you to carry on.
>
> Of course there are some things which still do not run as smoothly
> as possible. However I'm already trying to use kmatplot for
> 'production'.
>
> And of course I have some small feature request/questions (?)
> (in order of my personal importance):
>
> 0)) Any plans for a little bit more elaborated docu/tutorial ?
> Would be really important that others can test and use Kmatplot !

The docs for KMatplot 0.3.1 would be outdated already, as
 I redesigned GUI part, so maybe after releasing 0.4 ?

> Now my questions:
>
> 1) Is it possible to use greek letters, symbols  (like e.g. symbol.ttf
> font) together with other fonts in one row of text
> (legend, axis text etc.). One quite often wants to print
> something like 'cross section sigma'  where sigma is the greek
> letter. In addtion, the same is true for sub- or suerscripts.
> With that feature kmatplot can already nicely be used to produce
> 'ready to publish pictures'.

No, unfortunately all titles/labels are a "pure" text. Now I rewrote
KMatplot to use Qt 3.0, which has RichText editor built-in and I'm currently 
implementing a rich text labels.

> 2) Can there any calculations be done inside kmatplot, e.g. I have
> one column with time values and want to calculate a new column
> with, say, sin(time) ?

You can rename sheet to, for example, 'sheet' and choose Fill selected
range/Formula from a popup menu. Now you can use variable 'sheet' in your
formula. For example  - this formula will calculate sinus of column 0 :
sin(sheet(:,0))
Unfortunately you will have to repeat this operation every time you want a
formula to be recalculated. On the other hand you can set "Formula matrix"
with the above expression as y-data of your plot, and click Apply button
every time recalculation is needed. Of course it would be better to insert
formulas directly into sheet cells, but it is extremely hard to say which
particular cells the formula depends on ( which is needed for an auto-update
feature ) . For example which cells are used to calculate formula like this ?
sheet1(sheet2(0:2:sheet3(3,4),:),[3 2 8])

> 3) May be you can put a small plan for future releases on
> sourceforge, which can be discussed in the mailing list.

I have never been able to follow any plans so I'm afraid that people would
get frustrated ... Of course, I'm always waiting for suggestions and new
ideas,so if you have ones you can post them on the mailling list ( if it 
works for you ) but I learnt not to give any promises or to make some 
long-term plans...

> 4) Plans for a fitting module ? In connection with that, there is a
> very nice framework for datay acquisition/analysis with astonishing
> featues called ROOT (http://root.cern.ch). however for a lot of it is
> much "oversized". It is also open source (C++), and may be some code
> may be used from that. E.g. it has a well proved fitting module,
> (function minimizer) MINUIT, which now exsists for I think about
> 30 years

Thanks for the link, again ! KMatplot has a quite powerful formula framework
so all algorihtms like triangulation, gridding, FFT, statistics etc... should
be implemented as functions, possibly in separated modules. But before that I
have to implement loading of external modules and improve a grammar a bit.

Kamil


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