gmane.comp.graphics.veusz.general

Veusz Requests - FITS import, 2D dataset operations and plot axis sizes

Mark Durre — 2013-05-24T02:31:34

Hi,

Some more Veusz requests.

(1) Fits Import & WCS. As a follow-up to Christian Ambrose's query on fits file imports, I would find it useful to have a function, either on the import step or later, to reset the WCS header data on 2d datasets, I.e. Set the CRPIX1/2, CRVAL1/2 and CDELT1/2 values to 1. This means that each pixel co-ordinates is just the matrix position. This would obviously be useful mainly for data that has square pixels.

(2) Expanding operations to include 2D datasets. As far as I can see, Operations only happen on 1d datasets, is this correct? If so, I would like to be able to expand this to 2D dataset where appropriate. For example, I would like to be able to filter images to mask out low values, setting them to Nan, so they are not plotted. You can do this with Transparent data, but it's a pain. You would probably need a generic value name for the data for the filter function, e.g. '($DATA<10)'

(3) Graph Axis Sizes. At the moment, the size of the plotting area is controlled by the page

Re: Anonymous usage statistics

Kelvin Quee — 2013-05-23T12:41:45

Me thinks this is a good idea! In particular, looking at which features are most frequently used/not used can also help improve the design and features. 

Recording crashes and sending over a dump will be exceedingly useful in improving stability. 

Making public the recorded data can help assure privacy concerns. 

Kelvin Quee 魏有豪
Sent from mobile
+65 9177 3635

On 23 May, 2013, at 16:51, Jeremy Sanders <jeremy< at >jeremysanders.net> wrote:


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Anonymous usage statistics

Jeremy Sanders — 2013-05-23T08:51:28

Would anyone object if I were to add optional anonymous usage statistics 
to Veusz? I think it would be quite nice to know how many people are 
using it.

The idea I had in mind would be if the program was used for more than a 
few days, it would pop up a dialog box asking whether to send anonymous 
statistics.

If so, the program would download a particular web page monthly or every 
two weeks. On average, the number of downloads of this page per month 
would give some indication of the usage. It might also record the date 
of original installation, to get an idea of the time used.

I have some other ideas which might be more controversial:

- Record statistics of plot widget types used - might be helpful to 
identify which features are being used

- Record statistics of import data file types

- Record statistics of dialog boxes used

- How often the program is used

Does anyone have any opinions? Is this a good idea? How far should it go?

Jeremy

Re: VSZ file saved on a Mac causes an error when opened on Windows, due to line endings

Jeremy Sanders — 2013-05-21T09:20:57


Opening unix style ending files in windows works for me. Veusz uses 
Python's universal line ending support.

I suspect there is a particular problem with this file. Have you still 
got the version which gives the errors, and would it be possible to send 
it to me?

Jeremy

VSZ file saved on a Mac causes an error when openedon Windows, due to line endings

Paul Troughton — 2013-05-21T08:35:05

Today I tried for the first time collaborating with somebody else using Veusz on a different platform, and it didn't go quite as smoothly as I hoped.

When I saved a VSZ file using Veusz 1.17.1 on OS X 10.8.3, it had LF line endings. 

When my colleague tried to open it on Windows (it looks like Windows 7, and is presumably running a recent version of Veusz), he got a dialog saying "Error opening file" ... "SyntaxError: EOL while scanning string literal", reported in line 1085 of openFileInWindow.

Manually changing the file to have CRLF line endings (matching VSZ files saved on Windows) avoided the problem.

It would be nicer if Veusz could be tolerant of foreign line endings when reading VSZ files.

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Re: Bar plot: how to use two y-axes

Martin — 2013-05-16T08:47:33

Hi Paul

Many thanks - most helpful! I had not thought to use two x-axes but this 
works well. By playing around with min and max position I can obtain a 
pleasing arrangement of the bars. However, the error bar lines do not 
stay with the bars - they appear to become offset. Do you haver any 
further ideas about this? I suspect this is a bug.

With grateful thanks, Martino

On 16/05/13 09:22, Paul Cardinaels wrote:

Re: Bar plot: how to use two y-axes

Paul Cardinaels — 2013-05-16T08:22:25

Hi Martino,

Try playing around with the Min position and Max position in the 
properties section of two different x-axis, if you set the first one 
from 0 to .5 it covers the first half of the graph, and the second from 
0.5 to 1 it covers the second half.
I hope this helps!

Kind regards,
Paul

On 05/16/2013 10:18 AM, Martin wrote:

Bar plot: how to use two y-axes

Martin — 2013-05-16T08:18:07

I am relatively new to Veusz and am finding it very useful, so a big 
thank you to everybody concerned. I have a question if I may: Drawing a 
simple bar plot I cannot figure out how to draw two sets of bars that 
have different y-axes. Simplified example:

Group1
High = 2
Low = 1

Group2
High = 200
Low = 100

I want to plot four bars on a graph using a left hand y-axis for Group1 
and right hand y-axis for Group2. I understand how to use different 
y-axes but how can I space the bars so that they read, from left to 
right: 2, 1, 200, 100?

At the moment I have a bar plot with the two y-axes but the two sets of 
bars are overlapping each other.

Any hints would be much appreciated.

Yours, Martino

Veusz function requests - entering names andreferencing data

Mark Durre — 2013-05-16T07:12:51

Hi there,

GREAT program! I've just got a couple of small requests.

(1) It would be great if you could import multiple files at once, rather than one at a time. This would require checking that they were all of the same type (e.g. FITS files) and that the dataset names were set using the $FILENAME prefix or suffix.

(2) When you are changing the page or dataset names, the name is blanked out and you have to type the whole changed name in again. It would be useful if you could edit this "in place", so, say, single characters could be changed.

(3) On labels, it would be nice to be able to refer to the dataset name or filename. cf. IRAF plotting puts the filename on the plot automatically. This could be done through, say, "$DATASET"?

Mark Durré
Ph.D. Student
Centre for Astrophysics and Supercomputing
Swinburne University of Technology
PO Box 218, Hawthorn
Victoria 3122, Australia
Email: mdurre-5EyVZZlRSuG6c6uEtOJ/EA< at >public.gmane.org<mailto:mdurre-5EyVZZlRSuG6c6uEtOJ/EA< at >public.gmane.org>

___________________

Re: Unicode problem

Jeremy Sanders — 2013-05-14T13:29:31

Dear Paul

On 05/14/2013 03:05 PM, Paul Schwenn wrote:


Have you tried the official binary?
http://download.gna.org/veusz/Binaries-Windows/veusz-1.17.1-windows-setup.exe

I assume that you're using something like the following at the top of 
your file?
# coding: utf-8


This should work, as Veusz does have some Unicode source code already 
(e.g. widgets/polar.py) and is distributed with pyinstaller.

I remember it was a bit difficult to get pyinstaller to work properly. I 
had to remove the python3 parts of PyQt to get it to package correctly. 
You also need a working compiler in Windows.

If you send me the error logs it might help fix the problem. I could 
send you my pyinstaller directory. I don't remember what version I'm 
using without investigating. I believe the .spec file is up to date in 
the github repository.

Jeremy

Re: Unicode problem

Paul Schwenn — 2013-05-14T13:05:11

Hi, and thanks for the great work on Veusz!

I made a Tools Plugin that creates xy plots and dataset names with utf-8
symbols. This works fine if I run from source with encoding set to UTF-8 in
eclipse (Windows 7). However, it fails if I run the plugin from Veusz
installed with veusz-1.17.1.win32-py2.7.exe.

UnicodeEncodeError: 'ascii' codec can't encode character u'\u0394' in

I would like to distribute the Tool Plugin and Veusz to others who don't
have python installed. So I thought I could rebuild the installer using
pyinstaller-2.0 (If that was used to generate the windows installer).

I found a few pyinstaller '.spec' files on github (
https://github.com/jeremysanders/veusz) but they don't seem to work.

Can someone please build the installer for Veusz 1.17.1 with utf-8
encoding, or suggest how to get pyinstaller to work with the veusz source?

Is there another way to create the windows installer from source with
encoding set to UTF-8?

Many thanks in advance,

Paul


On Tue, May 14, 2013 at 11:02 PM, P

Re: again: change axis defaults on fits

Jeremy Sanders — 2013-04-19T19:46:27


I'm not quite sure what you mean. Do you want to plot a 2D dataset from 
a fits file with your own coordinates?

You can manually create a 2d dataset in the command interface doing 
something like

import pyfits
f = pyfits.open('example.fits')
SetData2D('dataset', f[0].data, xrange=(0.,1.,), yrange=(0.,1.))

Where 0 and 1 are the minimum and maximum values for the pixel centres 
on the axis.

Jeremy

Re: again: change axis defaults on fits

Christian Ambros — 2013-04-17T20:20:29

Hi Pat,

if you just want to extract some few and special pixel values you kann do it with something like:
g.ImportFITSFile('myfits', 'blabla.fits', 0, linked=True)
pos=GetClick()
x=pos[0]
x=x[1]
y=pos[1]
y=y[1]

which extracts x and y position in quick'n'dirty mode. pos[] gives you a tupel of tupel. You sure can write that much shorter and more direct, but to demonstrate what you can you, I broke it down to realize the structure. 
if you already have x and y than you can just browse the data section of the fits to get its value, it's a numpyarray.

cheers, Christian

--

"A little learning never caused anyone's head to explode!"



"Ein wenig Lernen hat noch niemandens Kopf zum Explodieren gebracht!"

--- Patrick Durrell <prdurrell-MqGRsGvQ6hI< at >public.gmane.org> schrieb am Mi, 17.4.2013:

Von: Patrick Durrell <prdurrell-MqGRsGvQ6hI< at >public.gmane.org>
Betreff: Re: [Veusz-discuss] again: change axis defaults on fits
An: veusz-discuss-8nu/KwtRnEU< at >public.gmane.org
Datum: Mittwoch, 17. April, 2013 12:25 Uhr


Jere

Re: again: change axis defaults on fits

Patrick Durrell — 2013-04-17T16:25:35

Jeremy Sanders <jeremy< at >...> writes:
 


Perhaps a related question, but I am using VEUSZ to read in a FITS file, and
the WCS information is not correctly incorporated -- I get pixel values and
intensity, and not RA/DEC.  How can I go about extracting the X and Y pixel
locations (and intensity values) from the 2D file (and placing them into 1D
vectors) so that I can (manually) create new RA and DEC arrays to use for
plotting purposes?
  Pat Durrell

ANN: Veusz 1.17.1

Jeremy Sanders — 2013-04-11T19:25:42

I've made a Veusz 1.17.1 release, which is primarily to fix a couple of 
obvious bugs. Please find below the release notes.

Jeremy


Veusz 1.17.1
------------
http://home.gna.org/veusz/

Veusz is a scientific plotting package.  It is designed to produce
publication-ready Postscript/PDF/SVG output. Graphs are built-up by
combining plotting widgets. The user interface aims to be simple,
consistent and powerful.

Veusz provides GUI, Python module, command line, scripting, DBUS and
SAMP interfaces to its plotting facilities. It also allows for
manipulation and editing of datasets. Data can be captured from
external sources such as Internet sockets or other programs.

Changes in 1.17.1:
  * Allow coloured points for non-orthogonal plots (polar, ternary)
  * Remove unnecessary exception data

Bug fixes:
  * Fix Print dialog
  * Fix command-line "Print" command
  * Fix duplicate axes drawn in grid
  * Fix crash adding empty polar plot
  * Exit properly on Mac OS X with --export option
  * Fix highlighted button ic

Re: Veusz 1.17.1 release candidate

Paul Troughton — 2013-04-11T08:41:28


Sorry for the delay. I've just checked: it launches fine.

Cheers,


Paul.

Re: Veusz 1.17.1 release candidate

Jeremy Sanders — 2013-04-11T08:37:17

Has anyone tried the Mac version? Can you confirm whether it works ok?

Thanks

Jeremy

Re: plotting live data using veusz.embed

Jeremy Sanders — 2013-04-11T08:34:06


You need to give your columns different names (e.g. x1, x2, y1, y2). You 
also need to add more than one xy plotter and set the xData and yData 
settings to be these names (x and y are the defaults). See the saved 
document format for more details.

Using the new object-oriented interface (highly recommended if you're 
not using this), you can do

embed = veusz.Embedded('window title')
page = embed.Root.Add('page')
graph = page.Add('graph')
xy1 = graph.Add('xy', xData='x1', yData='y1')
xy2 = graph.Add('xy', xData='x2', yData='y2')

...

xy2.xData.val = 'x3'

Jeremy

Re: Time coordinates?

Jeremy Sanders — 2013-04-11T08:29:27

If you're happy with the standard import interface, you can give it a 
file like

descriptor mydate dnsg dnsx  # optional names, can be entered in dialog
2013-04-08T13:21:00 6.80 8.15
2013-04-08T13:22:00 9.30 20.53

Acceptable date/times should also include 2013-04-08 and 12:33:33.

You have to set the axis mode to "datetime". You can change the 
regularity of the tick positions in the Major Ticks formatting option 
tab (under number).

CSV file support could look like this

mydate,dnsg,dnsx
2013-04-08T13:21:00,6.80,8.15
2013-04-08T13:22:00,9.30,20.53

For CSV format you can choose the date format in the import dialog.

You can also enter dates in this format manually in the Data Edit dialog 
box (choose New->Date/Time dataset).

Jeremy

On 04/08/2013 09:32 PM, Sherwood Botsford wrote:

Re: plotting live data using veusz.embed

Steven hunyady — 2013-04-10T20:21:36

live
the
a
this

Many thanks! I saw this under "Reading other data formats" but now I 
understand its value.

My next puzzle is how to plot multiple columns of data. I see how it is done 
in the command line interface with a second xy plotter, but that does not 
appear to work in the embedded interface. I'll post the code if needed.

Thanks again. -sjh

Re: Time coordinates?

Sherwood Botsford — 2013-04-08T19:32:33

So far I've been  unable to create anything with a time axis.  Perhaps I'm
looking in the wrong place.

One set of sample data, space delimited.   Converting to comma delimted
would be a simple SED command.  Two measuresments per interval  Letters are
just for human readability.

2013-04-08 13:21:00 DNS G 6.80, DNS X 8.15
2013-04-08 13:22:00 DNS G 9.30, DNS X 20.53
2013-04-08 13:23:00 DNS G 13.37, DNS X 12.24
2013-04-08 13:24:00 DNS G 15.26, DNS X 8.40




Respectfully,

Sherwood of Sherwood's Forests

Sherwood Botsford
Sherwood's Forests --  http://Sherwoods-Forests.com
780-848-2548
50042 Range Rd 31
Warburg, Alberta T0C 2T0



On 8 April 2013 11:44, Jeremy Sanders <jeremy-rZTbbJwr4dtS98Db7trcLl6hYfS7NtTn< at >public.gmane.org> wrote:

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