photutils | Astropy package for source detection | Dataset library
kandi X-RAY | photutils Summary
kandi X-RAY | photutils Summary
Astropy package for source detection and photometry. Maintainers: @larrybradley and @bsipocz
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Top functions reviewed by kandi - BETA
- Fit an image .
- Calculate aperture photometry .
- Calculate the source properties of a segmentation image .
- Find local peaks within a given threshold .
- Calculate the centroid of a masked array .
- Calculate the total error .
- Extract stars from data .
- Deblend a source image .
- Build an ellipse model .
- Create a grid from an image .
photutils Key Features
photutils Examples and Code Snippets
Community Discussions
Trending Discussions on photutils
QUESTION
I am aiming to create a progress bar for an iteration happening inside an installed module.
To create a progress bar for an iteration inside a user-defined function, I pass an tqdm.notebook.tqdm_notebook
object as iterable:
ANSWER
Answered 2022-Jan-01 at 21:07Of course generally there is no way to directly modify some existing code you didn't write yourself (whether or not it's "installed" is not the issue).
If you think it's really of general use or interest you could propose a patch to allow this function to take, e.g., a callback function to call on each loop. It might be useful if it's a slow function in general (I did notice some things in the implementation that could be changed to speed it up, but that's another matter).
You could of course find a number of clever hacks to make it work in this one specific case, though it would be fragile considering that it's a hack designed specifically to the implementation details of this function. I found a few possibilities for this.
The simplest seems to be this stupid trick:
Make an ndarray subclass (I called it tqdm_array
) which when iterated in Python returns an iterator over a tqdm progress bar which wraps the array itself:
QUESTION
I am trying to save a QTable object which originates from a Isophote list of an elliptical isophote fit, to really any filetype (.txt, .csv, etc.) that allows me to simply just load it back into the script without having to clean it or any of that sorts.
- The QTable is created as follows:
ANSWER
Answered 2021-Apr-19 at 09:45Astropy already has numerous built-in formats for saving Tables with Table.write.
For QTable
in particular, if you want a round-trippable text-based format the ECSV format is highly recommended, as it also outputs metadata concerning each column's types and units. If you name your file with a .ecsv
extension, this format is used automatically. For example:
QUESTION
I am currently trying to run a set of images (masked arrays / masked 'fits' files) of m87 through an isophote fitting function. Hereby one reference fit has been performed earlier in the script, which provides the function with the isophotes geometry, that are then used to sample the remaining images of the galaxy. The function looks as follows:
...ANSWER
Answered 2021-Mar-23 at 16:19The below looks wrong to me - should you not be appending "iso_" to isolist_temp within the for loop?
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Install photutils
You can use photutils like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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