Description:
IDL and PV-Wave language discussions.
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Problem changing color table
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Hi, I am using IDL 7.0, and I am having a hard time with the color tables. To change the table I have been typing: DECOMPOSE=0
LOADCT= 39
This color table should include a lot of colors, but no matter what reference number I use, I get a shade of red. I have also tried other tables, and still I get red.... more »
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Plot Singular values
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Hi all,
I used the Singular value decomposition (SVDC) and I got the matrix W which contains the singular values. Now I want to plot these singular values in logarithmic scale. Does anyone know how to do this?
With thanks
Mar
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True-Type Font Confusion
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Folks,
I've spent a couple of confusing hours this morning trying to understand true-type font handling in IDL on Windows computers for an article I'd like to write. I don't have time to write the article now, but I thought I would jot a few observations down in case I ever get back to it.... more »
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file I/O and arithmetic calculation
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What do you imagine the mean of the first column of data has to do with the mean of the first row of the data? This is kind of like learning your dentist has three children.
Anyway, something like this would work:
Openr, lun, file_one, /Get_lun
row = Fltarr(7)
ReadF, lun, row... more »
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minimization method(amoeba subroutine)
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Hello everyone,
Can anyone please explain me about minimization method. I recently read in a paper "The minimization was done using down hill simplex method(Nelder and Mead(1965)), So I checked in idl which routine will do this and found that amoeba subroutine will do this. But I couldnt understand the concept behind this. Could any of you explain me what exactly this 'amoeba subroutine' does and how to use it.... more »
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Coyote Library Update
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Folks,
There has been a major update of the Coyote Library today concerning an issue with True-Type fonts that came up yesterday. The key to the success of Coyote Graphics is the ability to create extremely high-
quality raster and PostScript output in a device independent way. To this end, it is necessary to be able to use True-Type fonts in a natural... more »
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Good practices with hashes
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Dear IDLers,
I'm trying to be "up to date" and use the new neat syntax offered by IDL 8. My apologies in advance if my question is trivial.
I was thinking about using hashes of hashes to store a kind of dynamic database. For example:
table = hash()
table['lake_1'] = hash('id', 1, 'depth', 100, 'name', 'lake1', $... more »
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LinkedHash in IDL
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Hi IDL devs,
I just wanted to ask if there is any plan to add linked hashes to IDL. e.g. like javas LinkedHashMap. These are very usefull when you want the to be able to do hash type lookups but still want the data to be ordered. Its painful to have to track the order seperately then have to resort the hash values.... more »
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IDL 8.2 legend problem
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Hi all, I'm not sure whether this problem about the new legend function in IDL 8 has been solved. But in IDL 8.2, the position of the legend keeps changing when I resize the window . I couldn't find any other information online except an earlier post by David Fanning. But that's a long time ago in 2011. Now could someone please tell me whether this bug has been fixed? and in which version?... more »
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ENVI_SVM_DOIT
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Hi! I would like to use IDL/ENVI to classify some data using SVM. Let's say I have 100 training samples, with 3 features each, like this:
seed = 123
xTR = RANDOMU(seed,3,100)
yTR = xTR[1,*] GT 0.5
and want to classify some test samples
xTE = RANDOMU(seed,3,100)
An option in IDL/ENVI seems to be ENVI_SVM_DOIT.... more »
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