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From: Schwab,Wilhelm K <bschwab@an...> - 2010-09-21 20:58:19
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Hello all, Are any of you using PLplot to produce scalograms or similar graphics? Bill |
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From: Hezekiah M. Carty <hezekiahcarty@us...> - 2010-09-23 01:00:41
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On Tue, Sep 21, 2010 at 4:58 PM, Schwab,Wilhelm K <bschwab@...> wrote: > Hello all, > > Are any of you using PLplot to produce scalograms or similar graphics? > > Bill > Bill, I haven't used PLplot for this, but the plimage and plimagefr functions may be useful to build such functionality. Hez |
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From: Schwab,Wilhelm K <bschwab@an...> - 2010-09-23 02:28:17
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Hez, I probably should dig into wavelab's source to look for clues on how, if at all, they take advantage of the longer scales (the ones with few coefficients). The detail of the shortest scale present in the DWT uses roughly half of the memory of the transform. Blowing it up into a rectangular matrix would take considerably more storage than the transform. The good news is that in modern hardware, it's probably reasonable to ask for that amount of memory. Of course, sparse storage would start to hurt on the shorter scales. gnuplot has a map view that enters into making colored images. At least in some situations, one draws a 3D plot and tells gnuplot to project it without perspective. Is there anything like that to worry about in PLplot? If you don't know what I mean, that is probably a good sign :) Thanks! Bill ________________________________________ From: hcarty@... [hcarty@...] On Behalf Of Hezekiah M. Carty [hezekiahcarty@...] Sent: Wednesday, September 22, 2010 9:00 PM To: Schwab,Wilhelm K Cc: plplot-general@... Subject: Re: [Plplot-general] PLplot+wavelets? On Tue, Sep 21, 2010 at 4:58 PM, Schwab,Wilhelm K <bschwab@...> wrote: > Hello all, > > Are any of you using PLplot to produce scalograms or similar graphics? > > Bill > Bill, I haven't used PLplot for this, but the plimage and plimagefr functions may be useful to build such functionality. Hez |
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From: David MacMahon <davidm@as...> - 2010-09-23 03:54:30
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Hi, Bill,
Some time ago I added support for "arbitrary storage of 2d data". I
still need to document this more ("real" work has taken precedence
since that time), but the idea is that many of the 2D plotting
functions would access the 2D data field using a set of potentially
custom accessor functions. Using this technique, one could store
sparse data however was most convenient/efficient and provide
accessor functions to allow PLplot functions to access it as a fully
populated 2D data array. In theory, one need not even have data if
the "accessor" functions were actually "generator" functions! I
think this could help with interfacing to your DWT data in an
efficient way.
Dave
On Sep 22, 2010, at 19:28 , Schwab,Wilhelm K wrote:
> Hez,
>
> I probably should dig into wavelab's source to look for clues on
> how, if at all, they take advantage of the longer scales (the ones
> with few coefficients). The detail of the shortest scale present
> in the DWT uses roughly half of the memory of the transform.
> Blowing it up into a rectangular matrix would take considerably
> more storage than the transform. The good news is that in modern
> hardware, it's probably reasonable to ask for that amount of
> memory. Of course, sparse storage would start to hurt on the
> shorter scales.
>
> gnuplot has a map view that enters into making colored images. At
> least in some situations, one draws a 3D plot and tells gnuplot to
> project it without perspective. Is there anything like that to
> worry about in PLplot? If you don't know what I mean, that is
> probably a good sign :)
>
> Thanks!
>
> Bill
>
>
> ________________________________________
> From: hcarty@... [hcarty@...] On Behalf Of
> Hezekiah M. Carty [hezekiahcarty@...]
> Sent: Wednesday, September 22, 2010 9:00 PM
> To: Schwab,Wilhelm K
> Cc: plplot-general@...
> Subject: Re: [Plplot-general] PLplot+wavelets?
>
> On Tue, Sep 21, 2010 at 4:58 PM, Schwab,Wilhelm K
> <bschwab@...> wrote:
>> Hello all,
>>
>> Are any of you using PLplot to produce scalograms or similar
>> graphics?
>>
>> Bill
>>
>
> Bill,
>
> I haven't used PLplot for this, but the plimage and plimagefr
> functions may be useful to build such functionality.
>
> Hez
>
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From: Hezekiah M. Carty <hezekiahcarty@us...> - 2010-09-23 14:02:37
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On Wed, Sep 22, 2010 at 10:28 PM, Schwab,Wilhelm K <bschwab@...> wrote: > > gnuplot has a map view that enters into making colored images. At least in some situations, one draws a 3D plot and tells gnuplot to project it without perspective. Is there anything like that to worry about in PLplot? If you don't know what I mean, that is probably a good sign :) > Bill, I am familiar with what you are talking about from past use of gnuplot. The 3D plotting functions are separate in PLplot, so you wouldn't approach the process that way unless you want to. The plimage and plimagefr functions (and plfimage/plfimagefr as David mentioned in his reply) work with 2D plot windows, requiring either a bounding box to draw within or a coordinate transform function to specify their location. http://plplot.sourceforge.net/docbook-manual/plplot-html-5.9.6/plimagefr.html http://plplot.sourceforge.net/docbook-manual/plplot-html-5.9.6/plimage.html Hez |
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From: Schwab,Wilhelm K <bschwab@an...> - 2010-09-23 15:22:00
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Hez, I'm glad to hear that. In truth, I am not at all certain that gnuplot requires a map projection of a 3D view, it was just how I was told to do things. Either way, I direct path to colored 2D will be appreciated. Bill ________________________________________ From: hcarty@... [hcarty@...] On Behalf Of Hezekiah M. Carty [hezekiahcarty@...] Sent: Thursday, September 23, 2010 10:02 AM To: Schwab,Wilhelm K Cc: plplot-general@... Subject: Re: [Plplot-general] PLplot+wavelets? On Wed, Sep 22, 2010 at 10:28 PM, Schwab,Wilhelm K <bschwab@...> wrote: > > gnuplot has a map view that enters into making colored images. At least in some situations, one draws a 3D plot and tells gnuplot to project it without perspective. Is there anything like that to worry about in PLplot? If you don't know what I mean, that is probably a good sign :) > Bill, I am familiar with what you are talking about from past use of gnuplot. The 3D plotting functions are separate in PLplot, so you wouldn't approach the process that way unless you want to. The plimage and plimagefr functions (and plfimage/plfimagefr as David mentioned in his reply) work with 2D plot windows, requiring either a bounding box to draw within or a coordinate transform function to specify their location. http://plplot.sourceforge.net/docbook-manual/plplot-html-5.9.6/plimagefr.html http://plplot.sourceforge.net/docbook-manual/plplot-html-5.9.6/plimage.html Hez |