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location Rome, Italy
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visits member for 1 year, 7 months
seen Sep 10 at 8:42

Sep
5
comment Importing FITS file from HEALPix
Thank you, George. This is extensive code. The image is a simulated CMB map, so it should not look like this at all. It has colours and I think the file should contain 5 (or 7) columns of 8bit numbers that can be plotted as colours. As I said, it is probably to difficult to get this, since HEALPix is probably using a modified FITS format (which is open source), and hence it is not standard any more...
Sep
4
revised Importing FITS file from HEALPix
added 110 characters in body; edited tags
Sep
4
comment Importing FITS file from HEALPix
@mfvonh: Thank you. Here is the FITS file, which makes the trouble.
Sep
3
comment Importing FITS file from HEALPix
@rhermans: Thank you for the tag correction!
Sep
3
comment Importing FITS file from HEALPix
@mfvonh: Unfortunatelly, uploading never finishes. It seems 13MB is too much. I'll try to make a smaller example file. However, I discovered that neither IDL can open the FITS file from HEALPix. It seems these guys modified the format a little bit and have even created a specific function in IDL to work with their format. The only hope know is to use a header of the FITS file and understand the structure of the rest of the file which is binary.
Sep
1
comment Importing FITS file from HEALPix
Sure, Yi, only that this is a FITS file format
Sep
1
asked Importing FITS file from HEALPix
Jul
2
awarded  Curious
Mar
2
awarded  Popular Question
Feb
19
awarded  Yearling
Jun
25
comment Why FrontEnd`KernelExecute doesn't work in KeyEventTranslations.tr?
I don't really understand what you are trying to say, nor what kind of problem you encountered. Have you gained better understanding of these commands in last days? If there is something still unclear, consider posting a new question.
Jun
25
comment Interpolating function as a model in Mathematica's procedures for fitting
That's exactly what I did :) Still, I miss such a feature integrated in Mathematica.
Jun
16
asked Interpolating function as a model in Mathematica's procedures for fitting
May
22
awarded  Necromancer
Apr
19
comment Copy last/second last (etc.) input from history into current cell
Have you seen edit to my answer? I am interested if it works with somebody else, because I didn't test it much.
Apr
19
comment Is it possible to marginalize one or several parameters obtained from fitting procedure?
Here is explained how one can plot confidence region from any covariance matrix c. Now I am trying to figure out how to get standard equation of ellipsoid from {x, y, z}.ci.{x, y, z} == t, where ci is the inverse of c. This would help in analytical analysis and make the plotting easier and prettier. Position of ellipsoid is given from Eigenvectors[c], but I am still missing radii. Different confidence level would influence the size of ellipsoid by scale factor Sqrt@InverseCDF[ChiSquareDistribution[n], confidenceLevel].
Apr
19
comment How to use a 3×3 covariance matrix to plot an error ellipsoid?
hahaha No, no, sorry, that's not what I wanted to say! I was more explicit to drag attention, only because comments are not often read. Honestly, I myself learned a lot from this answer and it is actually the answers for my question, too! (which is why I called it brilliant, as it is for any dimension). And now: if you are not interested in one variable and you want to see confidence regions for the rest of variables, you can either put some fixed value to that one variable and get new correlation matrix (by fitting again), or integrate probability function over that variable, eg. marginalize.
Apr
19
comment How to use a 3×3 covariance matrix to plot an error ellipsoid?
Certainly, whuber. The comment was not for you, but for beginners who have that common mistake in interpretation. As the OP didn't really know all parts of procedure when he posted the question, he also couldn't specify exactly what he needed. The comment for you, whuber, would be to give interpretation on what you are doing as you are the one who has the knowledge :) And therefore, avoid wrong interpretations by beginners.
Apr
19
comment How to use a 3×3 covariance matrix to plot an error ellipsoid?
If you are interested in only two variables you should not slice the ellipsoid!! Wrong! You have to do marginalization, which is in this case even simpler. Like I explained here you have to modify the covariance matrix and perform this brilliant procedure again for reduced number of variables.
Apr
17
asked Is it possible to marginalize one or several parameters obtained from fitting procedure?