astropy | Astronomy and astrophysics core library | Dataset library
kandi X-RAY | astropy Summary
kandi X-RAY | astropy Summary
Astronomy and astrophysics core library
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Top functions reviewed by kandi - BETA
- Update header data .
- Convolve a 2 - dimensional array using convolution .
- Convert world coordinates to pixel coordinates .
- Parse the grammar rules .
- Returns the components of the WCS object .
- Convolve an array using kernel .
- Mark a deprecated argument as deprecated .
- Calculate a poisson confidence interval .
- Calculate the z - value of a function .
- Decorator for support .
astropy Key Features
astropy Examples and Code Snippets
import cdflib
cdf_file = cdflib.cdfastropy.compute_epoch([2017,1,1,1,1,1,111])
if PlotStars:
# ... code ...
if store:
return positions
python is /opt/anaconda3/bin/python
python is /usr/local/bin/python
python is /usr/bin/python
import datetime
import re
import astropy.time as astropy_time # installed with PIP
faulty_data = "52164-01-19 00:00:00+00"
timeformat = re.compile(r"(?P\d{5})-(?P\d{2})-(?P\d{2}) (?P\d{2}):(?P\d{2}):(?P\d{2})(?P[+\- ])(?P\d{2})")
matc
hdul = fits.open('test.fits')
table = Table(hdul[1].data)
table.replace_column('test', [27, 27])
hdul[1] = fits.BinTableHDU(table)
hdul.writeto('new_test.fits', overwrite=True)
from astropy.io import fits
with fits.open('data.fits') as hdus:
hdu1 = hdus[1].data
raw = hdu1._get_raw_data()
class tqdm_array(np.ndarray):
def __iter__(self):
return iter(tqdm.tqdm(np.asarray(self)))
labels = np.array(segm_image.labels).view(tqdm_array)
pip 21.3.1 from /opt/conda/lib/python3.7/site-packages/pip (python 3.7)
from matplotlib.colors import LogNorm
plt.imshow(image_data, cmap='gray', norm=LogNorm())
echo "export SPARK_HOME=/opt/spark" >> ~/.profile
echo "export PATH=$PATH:$SPARK_HOME/bin:$SPARK_HOME/sbin" >> ~/.profile
echo "export PYSPARK_PYTHON=/usr/bin/python3" >> ~/.profile
Community Discussions
Trending Discussions on astropy
QUESTION
I am using astropy to detect sources in an image. I am trying to write a function that will detect my sources, with an option of storing their coordinates in an array, and another option to plot the sources. This is my code:
...ANSWER
Answered 2022-Apr-03 at 13:27Simple change order - first PlotStars
, next store
QUESTION
According to the pytest
documentation, I can block a plugin using -p no:name
. I confirmed that this works for other plugins. However, when I try this with hypothesis
it has no effect:
ANSWER
Answered 2022-Mar-12 at 20:32The officially supported option is to use settings
profiles to globally enable settings(database=None)
.
Alternatively, you could -p no:hypothesispytest
, but note that this is not a documented and supported approach - it may be changed to the more obvious -p no:hypothesis
, for example.
QUESTION
I am trying to build an app from a python file (Mac OS) using the py2app extension. I have a folder with the python file and the "setup.py" file.
- I first tested the app by running
python setup.py py2app -A
in the terminal and the dist and build folder are successfully created and the app works when launched. - Now when I try to build it non-locally by running the command
python setup.py py2app
in the terminal, there are various "WARNING: ImportERROR" messages while building and finally aerror: [Errno 2] No such file or directory: '/opt/anaconda3/lib/python3.8/site-packages/rtree/lib'
error.
How can I fix this? I've tried to delete anaconda fully as I don't use it but it seems to still want to run through it. Additionally, I have tried to run the build command using a virtual environment but I end up having even more import errors.
*I Left out a lot of the "skipping" and "warning" lines using "..." for space
ANSWER
Answered 2022-Mar-13 at 16:13The error error: [Errno 2] No such file or directory: '/opt/anaconda3/lib/python3.8/site-packages/rtree/lib'
was caused by py2app trying to build the program bundle using a non-existent interpreter. This means that even if you try to uninstall a manager like Anaconda, it still has option logs somewhere on your mac.
The fix:
- Open the terminal and type the command
type -a python
.
- You will see similar lines
QUESTION
I can't change the current satellite velocity from km/s units to arcsec units. This is a snippet of my code:
...ANSWER
Answered 2022-Mar-13 at 15:59The method you're using frame_latlon_and_rates
already returns latitudinal and longitudinal angular velocities which you're ignoring.
QUESTION
I want to display a FITS image in python. I have all this working using astropy (the FITS loader) and matplotlib and a greyscale image. However I have images that are 16 bit colour with a Bayer matrix of RGGB and I don't know how to display this as an RGB colour image.
This works for a greyscale image:
...ANSWER
Answered 2022-Mar-07 at 18:55The answer was to use OpenCV to debayer the image and then normalise the data.
QUESTION
I have two adjacent matrices that represent two brain structures (cerebellum and cortex):
Dataset:
...ANSWER
Answered 2022-Jan-21 at 02:14Here's a way to do what you want:
- First after loading your adjacency matrices to pandas you can convert them to two different graphs with
nx.convert_matrix.from_pandas_adjacency
- You can then join the two graph into a single graph by using
nx.disjoint_union
. The nodes of both graphs are basically concatenated onto a single graph (see more here). - Once you have the full graph, you can randomly draw nodes from the cortex part of the full graph with a 0.01 probability.
- Similarly you can draw the same number of nodes on the cerebellum part of the graph to act as recipients of the connection.
- Finally you can create the edges between the chosen nodes on both sides.
- And you can get your adjacency matrix from the final graph by using
adj_matrix_full=nx.linalg.graphmatrix.adjacency_matrix(full_g,weight=None)
See full code below for more details:
QUESTION
I have 4 functions for some statistical calculations in complex networks analysis.
...ANSWER
Answered 2022-Jan-26 at 15:38It looks like, in calculate_community_modularity
, you use greedy_modularity_communities
to create a dict, modularity_dict
, which maps a node in your graph to a community
. If I understand correctly, you can take each subgraph community in modularity_dict
and pass it into shannon_entropy
to calculate the entropy for that community.
this is pseudo code, so there may be some errors. This should convey the principle, though.
after running calculate_community_modularity
, you have a
dict like this, where the key is each node, and the value is that which the community belongs to
QUESTION
I'm trying to do a guassian fit for some experimental data but I keep running into error after error. I've followed a few different threads online but either the fit isn't good (it's just a horizontal line) or the code just won't run. I'm following this code from another thread. Below is my code.
I apologize if my code seems a bit messy. There are some bits from other attempts when I tried making it work. Hence the "astropy" import.
...ANSWER
Answered 2022-Jan-27 at 16:34There are two problems with your code. The first is that you are performing vector operation on list
which gives you the first error in the line mean = sum(wavelengths*intensities)/n
. Therefore, you should use np.array
instead. The second is that you take math.exp
on python list
which again throws an error as it takes a real number, so you should use np.exp
here instead.
The following code solves your problem:
QUESTION
I'm attempting to resize a column in a FITS BinTableHDU column after it has been created, but I can't seem to find a way to do this in the astropy documentation.
For example, suppose a simple fits file was created with a BinTableHDU containing a single column of length 3:
...ANSWER
Answered 2022-Jan-24 at 15:48In the example from the question, only one table column needs to be updated and with a different size. The Table
class has a replace_column
function to help with this.
QUESTION
I have a FITS file with a BinTableHDU that has many entries that have been converted from digital numbers various units like Volts and Currents. I would like to turn off this conversion and access the original digital number value that was stored in the table.
This table makes use of TTYPE
, TSCAL
, TZERO
, and TUNIT
keys in the header to accomplish the conversions. So I could use these header keys to undo the conversion manually.
ANSWER
Answered 2022-Jan-15 at 10:39You'll need to be using the direct astropy.io.fits
interface instead of the high-level Table
interface. From there something like this might work:
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
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Install astropy
You can use astropy 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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