emcee | Package web components in Rails applications | Application Framework library
kandi X-RAY | emcee Summary
kandi X-RAY | emcee Summary
Emcee is an extension to the Rails Asset Pipeline. It allows you to import and package web components exactly as you would Javascript or CSS.
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emcee Key Features
emcee Examples and Code Snippets
Community Discussions
Trending Discussions on emcee
QUESTION
I am having trouble accessing the values generated from emcee using the get_chain() method. My code is provided below:
...ANSWER
Answered 2020-Jul-02 at 16:57As you suspect, this is probably due to having installed an old version of emcee. You can check the version installed with
QUESTION
I am trying to implement lmfit
into my fitting routines, and I am having issues defining the errors. I premise that I read previous questions regarding the topic on this platform, and I also went through the docs, but some of my doubts are still there.
Below is a complete and minimal example of what I am trying to achieve.
...ANSWER
Answered 2020-Jun-02 at 12:06What you say in your edits is correct: You want to use weights=1./err
to properly weight the residual of data
and model
by the uncertainties in the data, err
.
You probably want to use the same in your call to model.fit(..., method='emcee')
too.
I should say that the use of emcee
in lmfit
is rather confusing and gives the unfortunate impression that it is doing a fit. This is simply not true, as emcee
(and, really MCMC as a method) can not really do a fit in the sense of "systematically refine parameter values in order to find an improved solution". What it is doing is exploring parameter space in the vicinity of the input parameter values (that happen to be the solution from the Nelder
method).
This exploration may find (more like "stumble upon" than "seek") an improved solution and the results will reflect the exploration it does.
QUESTION
In Python 2.7 I used to be able to use the following code (I'm using the emcee package):
...ANSWER
Answered 2020-Feb-26 at 20:17As Pete said, your example works for python 3.6.8. However, another way of doing what you want is:
QUESTION
Despite having a working script for curve fitting using the lmfit
library, I am not able to solve a display issue. Indeed, having only 5 dependent values, the resulting graph is rather coarse.
Before switching to lmfit
, I was using curve_fit
and could solve the display issue by simply using np.linspace
and plot the optimized values resulting from the fit procedure. Then, I was displaying the "real" values through plt.errorbar
. With lmfit
, the above solution yields a mismatch error, since it recognizes the "fake" independent variables and launches a mismatch type error.
My full script is the following:
...ANSWER
Answered 2019-Aug-28 at 17:36You need to re-evaluate the ModelResult with your new values for the independent variables:
QUESTION
I'm trying to create this timeline telling people about graffiti art. I have a problem where I couldn't cut short my page and it would let me scroll down to nothingness. Here is the code with only CSS and HTML.
EDIT: Here is a Gif about my problem is, I tried to remove the timeline: 3000px, but it only works for the snippet, didn't work for Dreamweaver. I tried to run on both Chrome and Firefox
...ANSWER
Answered 2019-Mar-08 at 02:29.timeline {
height: 3000px;
}
QUESTION
I am trying to fit a very complicated (Flattened Gaussian) model to a data I have obtained. Image for flattened Gaussian formula (variable fc in my code here represents vo, central frequency.)
I have written the code in python using from scipy.optimize import curve_fit. It is unable to optimize my equation and always gives the same answers for the parameters. Link to the data file: https://www.filehosting.org/file/details/795968/my-file.dat
...ANSWER
Answered 2019-Apr-21 at 20:04The default initial parameter estimates for scipy's curve_fit routine are all 1.0, and since no improvement on those estimates could be made they were returned giving "fitted parameters: [1. 1. 1. 1.]". If you look at a scatterplot of the data as shown below, the posted data does not lie on a flattened Gaussian peak - or any other preak equation - so curve_fit fails on the equation you used.
QUESTION
I have a function with three parameters a
,b
and c
and I want to define different priors for each of these parameters. I am using the emcee
package.
I started with the simple uniform (non-informative) prior:
...ANSWER
Answered 2019-Jan-31 at 17:36Try the following one:
QUESTION
I am using EMCEE Python package which is MCMC method.
When I choose 500
steps and 300
walkers everything is OK and after couple of hours I have the results and outputs. But as I change them to higher steps (800)
and higher walkers (400)
after many hours shell is restarted by python without any outputs and results.
I read the questions about this issue in stackoverflow, but I could not understand what should I do for this such a problem. Bwcause forlower steps and walkers I have the answer.
I am wondering iif there is any problem with RAM? with IDLE? or what?
Thank you
...ANSWER
Answered 2018-Dec-13 at 09:18I find the answer.
My laptop has Cori3 intel core and 4Gb DDR3 Ram. I improve the RAM to 8Gb and until and with 600
steps and 400
walkers I got the results.
I think, Python has many problems due to alarming wrong error.
QUESTION
I'm having an issue using emcee. Its a simple enough 3 parameter fit but occasionally (only has occurred in two scenarios so far despite much use) my walkers burn in just fine but then do not move (see figure below). The acceptance fraction reported is 0.
Has anyone else encountered this issue before? I have tried varying my initial conditions and number of walkers and iterations etc. This piece of code has been running well on very similar data sets. Its not a challenging parameter space and it seems unlikely that the walker would be getting "stuck".
Any ideas? I'm stumped... my walkers are lazy it seems...
Sample code below (and sample data file). This code + data file fail when I run it.
...ANSWER
Answered 2018-Aug-03 at 21:02Here's a better result. I made the random initial samples not so close to the maximum likelihood value and run the chain for a lot more steps with fewer walkers/chains. Notice that I'm plotting the m
parameter and not its exponential, as you did.
The mean acceptance fraction is ~0.48, and it took about 1 min to run in my laptop. You can of course add more steps and get an even better result.
QUESTION
A few days ago I renamed a branch (following these steps) named emcee
in my repo to emcee_old
. Then, I created a new branch with the same name (emcee
) but branching from a different point in my develop
branch. Here's how Github shows this process:
The issue is that now if I check a file in the new emcee
branch, it contains a commit that was made to that file in the old emcee
. For example the .gitignore file in the new branch shows a commit that was made in 2017 in the old branch:
Even weirder is that if I access the history of that file (in the new branch) that commit is not there:
Why is going on here?
...ANSWER
Answered 2018-Mar-07 at 19:02In short, Git does not carry commits between similarly-named branches.
So you created a branch, then renamed it and created a new one by the same name? I have done this in git v1.8.4.2 successfully, though without using Github.
I suspect an problem with Github's interface. You can test this by cutting it out of the loop and studying your repo's history locally, on the command line. Try running git log --graph --all
command in a terminal window and study the output. This will display all of your branches, and their converging/diverging history. Also try git log --graph --all .gitignore
to limit the history report to the file in question. I expect you will see a more predictable result, different from what Github displays.
This becomes more complex if there are other users of your repository. A collaborator could accidentally restore the old branch during a push. However your link indicates that you don't have to worry about this, as this is a solo effort.
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