astro | Keep your eyes to the skies , astronauts
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QUESTION
I am using lmfit for solving a non-linear optimization problem. It works fine to the point where I am trying to implement a measurement error as the standard deviation of the dependent variable y (sigma_y). My problem is, that I cannot interpret the Information criteria properly. When implementing the return (model - y)/(sigma_y)
they just raise from really low to very high values.
i.e. [left: return (model - y)
-weighting-> right: return (model - y)/(sigma_y)
]:
- chi-square 0.00159805 -> 47.3184972
- reduced chi-square 1.7756e-04 -> 5.25761080 expectation value is 1 || SO discussion
- Akaike info crit -93.2055413 -> 20.0490661 the more negative, the better
- Bayesian info crit -92.4097507 -> 20.8448566 the more negative, the better
My guess is, that this is somehow connected to bad usage of lmfit (wrong calculation of Information criteria, bad error scaling) or to a general lack of understanding these criteria (to me reduced chi-square of 5.258 (under-estimated) or 1.776e-4 (over-estimated) sounds like a really poor fit, but the plot of residuals etc. looks okay for me...)
Here is my example code that reproduces the problem:
...ANSWER
Answered 2021-Jun-12 at 02:48Well, in order for the magnitude of chi-square to be meaningful (for example, that it be around (N_data - N_varys), the scale of the uncertainties has to be correct -- giving the 1-sigma standard deviation for each observation.
It's not really possible for lmfit to detect whether the sigma you use has the right scale.
QUESTION
So I wanted the bot to reply with 'hi' every time someone mentions its name in a sentence. I wrote this but it's not working, could someone please help :)
...ANSWER
Answered 2021-Jun-08 at 12:43on_message
doesn't take a ctx
argument:
QUESTION
Can anyone tell me what is wrong with this code? It is from https://jakevdp.github.io/blog/2012/09/05/quantum-python/ . Everything in it worked out except the title of the plot.I can't figure it out.
but when the code is run, it polts this
Here is the code given:-
...ANSWER
Answered 2021-Jun-04 at 18:23The problem is resolved when blit=False, though it may slow down your animation.
Just quoting from a previous answer:
"Possible solutions are:
Put the title inside the axes.
Don't use blitting"
See: How to update plot title with matplotlib using animation?
You also need ffmpeg installed. There are other answers on stackoverflow that help you through that installation. But for this script, here are my recommended new lines you need to add, assuming you're using Windows:
QUESTION
I am a newbie as far as both Airflow and Docker are concerned; to make things more complicated, I use Astronomer, and to make things worse, I run Airflow on Windows. (Not on a Unix subsystem - could not install Docker on Ubuntu 20.4). "astro dev start" breaks with an error, but in Docker Desktop I see, and can start, 3 Airflow-related containers. They see my DAGs just fine, but my DAGs don't see the local file system. Is thus unavoidable with the Airflow + Docker combo? (Seems like a big handicap; one can only use a file in the cloud).
...ANSWER
Answered 2021-May-19 at 09:31In general, you can declare a volume at image runtime in Docker using the -v
switch with your docker run
command to mount a local folder on your host to a mount point in your container, and you can access that point from inside the container.
If you go on to use docker-compose up
to orchestrate your containers, you can specify volumes in the docker-compose.yml
file for your containers which configures the volumes for the containers that run.
In your case, the Astronomer docs here suggest it is possible to create a custom directive in the Astronomer docker-compose.override.yml
file to mount the volumes in the Airflow containers created as part of your astro
commands for your stack which should then be visible from your DAGs.
QUESTION
ANSWER
Answered 2021-May-19 at 05:42Answer
Remove the whitespace around the names:
QUESTION
I'm working with IRAF, based on SPP, kind of a mix between Fortran and C. I'm looking for a way of referring to a string content when using ls
. For example, I can type ls *hola*
if I want to list every file containing the word hola in my directory. Supose I have an string called id
whose content is the world hola. How could I refer to the content in id
? I'm looking for some sort of ls id
(I know that construction won't work) which returns the same result as in ls *hola*
.
Thank you in advance.
EDIT: SPP is somehow hidden on the Internet but here you have a reference manual https://www.mn.uio.no/astro/english/services/it/help/visualization/iraf/SPPManual.pdf although I haven't found any information there related to this topic.
...ANSWER
Answered 2021-Feb-20 at 18:20Using the C side of your SPP thing, if you have access to the C headers, the simple is use something like
QUESTION
I'm getting weather forecasting data from weatherstack API.
...ANSWER
Answered 2021-May-11 at 20:20This will create a dataframe with the required data and column names.
QUESTION
I am trying to build a photography portfolio in React, however, I am not sure if I am using the Link function correctly. Whenever I click a link on the website, it just overlays the new page over the old one. How do I fix it so that it re-renders the new page without being able to see the old one?
For example, when I click a link on the home page, the new one shows up like this:
I have wrapped the entire app in in the index.js file.
...ANSWER
Answered 2021-May-10 at 04:07also adding to what @Dov Royal said, you don't need the wrapper. the
wrapper would suffice
QUESTION
I want to do a plot of this equation below:
Problem 1: You see... since my function is a function of ν I have to calculate my integral to each ν in my domain. My question is: what is the best way to do that?
I thought about using scipy to do the integral and a for loop to calculate it several times to each ν, but it seems a very inelegant way to solve my problem. Does someone know a better alternative? Does someone have a different idea?
Problem 2: When I write my code I get some errors, mainly because I think that the exponential has a very small expoent. Do you have any ideas of how should I change it so I can do this plot using Python?
Oh, if you try with a different method, it is supposed to look like this
Here is the code I was working on. I'm coming back to Python now, so maybe there is some errors. The plot I'm getting is very different from the one that this is supposed to look.
...ANSWER
Answered 2021-May-07 at 07:11- Reuse the term R_est instead instead of writing its expression 3 times (better if you want to change that parameter).
- you used a
pi**2
in the constant multiplying the integral (don't affect the shape) - The shape resembles what you put as reference, but not in the suggested range.
- You are using the value of
T
asT_*
, are you sure about that?
Try this version of the code
QUESTION
So I hope the title makes sense but heres more context .
I want to make my own camera app and I am following this Google Practice for cameraX. I have got the camera working on my physical phone but the problem is I cant view my images that I have taken. Weird thing is the images appear in the gallery the next day and not right after taking a photo.
Now im not too sure why that is but after researching it seems that the file is not being saved in a public directory at least thats the conclusion I have succumbed to. This is the directory that the app saves to: /storage/emulated/0/Android/media/com.astro.openingcamera/openingCamera.
This is the block of code that produces the directory
...ANSWER
Answered 2021-Apr-30 at 01:09I found the solution as suggested by blackapps I used a mediascanner to update the directory so heres my code
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