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• Nov 09 2020 13:10
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mesnardo on master

Minor changes * [Module 2, Lesâ€¦ (compare)

• Dec 04 2019 01:43
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• Aug 30 2018 20:53

labarba on format

Ian Hawke
@IanHawke
Yes - I've lost some long replies in the forums the past couple of days (when testing, I should remember to keep them short...).
Maybe we should set a mini-exercise to evaluate the energy loss due to numerical error?
GTG.
Lorena A. Barba
@labarba
I've got that written up!!! (and it's actually an energy gain)
Actually, what I have written up is just the proof that T_{n+1}=T_n(1 + w^2 Delta t ^2) -- one page of algebra
But you suggest giving that to students to do?
Sigurd Angenent
@SigurdAngenent
Hi, thanks for running this MOOC. It seems like quite a project. I think that the first python script can be simplified. In phugoid.py you compute the radius of curvature, the center of the osculating circle and then rotate the point by a small angle. But you could also use the diffeqs dx/ds = cos(theta) and dz/ds=sin(theta) to increment x and z
Sigurd Angenent
@SigurdAngenent
OK, the indentation in my previous post is gone. I don't see how to do that. I don't understand github wel enough to upload the modified-phugoid.py file..
Alistair Walsh
@alistairwalsh
github is not exactly intuitive :-) I would suggest a tutorial like https://try.github.io/levels/1/challenges/1
aarrietac
@aarrietac
Yeah! This is an amazing tutorial for git! Thanks @alistairwalsh :clap:
scshepard
@scshepard
Anaconda install observation; I'm using the Prof recommended site (https://store.continuum.io/cshop/anaconda/) but fell into a couple of Dark Places; first, the user interface is "odd"; suggest you "hover" over the link to verify the file name before clicking. Also (it may be a Windows or Windows 8.1 issue) had to edit the system PATH because Anaconda set its self as a "user" not system install (i.e: Had to delete the old python PATH in system; it is in my user PATH, but system PATH over-rode it). Now, all works great! (for what it's worth, I'm running Python 3.4)
Lorena A. Barba
@labarba
anyone there wish to test our new installation ???
I need testers
We're testing a new course platform for the course, with the latest version of Open edX and will migrate the course tomorrow if all tests pass!!!
Help!
Uncustomized with our style, but all course state until last Friday in the new installation: Please try to break it ....
within reason ...
Lorena A. Barba
@labarba
if it passes, we'll add the custom style, delete the course and re-migrate it from the live version.
Alistair Walsh
@alistairwalsh
I can check, what exactly do you want me to install. I have native Mac, Linux and Windows as well as virtual machines. Does it need to be full native or is installing on the virtual machines enough?
login/password from the old site doesn't work with the new one. Is that what you expected?
Lorena A. Barba
@labarba
Nothing to install ... when did you register? They migrated the course state from last Friday, so if you registered after that, it wouldn't have you.
But my credentials from the previous course worked just fine. It should recognize any users that signed up until Friday morning.
I just want people to make test posts on the forum, upload an image, pin, flag, +1, etc.
Alistair Walsh
@alistairwalsh
I can access the old site, I can access the new site but had to create a new profile
I'm just going to check my login details and make sure I'm entering the right info...
Also didn't receive the confirmation email the site said it was sending with the new account.
Yurlungur
@Yurlungur
Hi this is Jonah from the discussion forum. I can access the new site and use the discussion forum. However, the new site rejected my credentials from the old site. And when I tried to register with my old username, it told me someone was already registered. I made a new profile so it doesn't matter, but I wonder if there's something wrong with your database?
Alistair Walsh
@alistairwalsh
I'm also not receiving the confirmation email the new login should have generated. The site gives a message that it sent a second one, not received
Alistair Walsh
@alistairwalsh
I was using the old site before Friday
Lorena A. Barba
@labarba
Lorena A. Barba
@labarba
If more people try it, more chances that we'll know whether this is bug free!
Plan is to migrate the course tomorrow to the new instance of Open edX.
Of course it will never be bug free. We just need it to be stable and functional.
OK, I think I need to go back to work on our next notebook. Tell me later how it works.
Chris Short
@ChristopherShort
No problem using old login. But posts and replies generate an error suggesting failure. But posts and replies actually end up on discussion board.
I cleared my cache before trying anything too. Maybe that matters for old logins?
Could see my own replies to my own "Test Post" before. Now clicking on the post doesn
Lorena A. Barba
@labarba
I don't see any new posts ... are they there?
Naty Clementi
@ncclementi
I can't login using my old credentials...
Hal Snyder
@DrXyzzy
Same here, old creds rejected. Tried to create new user. First it told me username already taken, then it said I need to respond to confirmation email, which I did not receive, at least after 5 min or so.
Lorena A. Barba
@labarba
Thanks ... all reported to dev team. They need to review how they imported the user database. Will keep you posted.
Hal Snyder
@DrXyzzy
posted a couple minor things to Test_tingyu comment thread
scshepard
@scshepard
Silly question, no rush: I can create notebooks (I am grateful!). However, when changing them in the "editor", how do I re-run to see the new plot? And I can't seem to figure where the "save as" function is. Thanks muchly!
Gil Forsyth
@gforsyth
@scshepard If you have a code cell selected, hit Shift+Enter to run it. If you change some variables around, you'll also have to re-run the plotting code so it runs again with the new values. If you want to change the name of the notebook, just click the existing name at the top and you'll be able to rename it.
scshepard
@scshepard
@gforsyth Duh! I am so "old" when it comes to these "nameless" features. Of course. Many thanks! However, it seems that I to copy the "plotting code", create a new workbook to get it to re-plot (shift enter does not make any change to it). But at least I have a "workplan" for my own tutorials.
scshepard
@scshepard
Yurlungur
@Yurlungur

Corrections to module 01_02:

In cell 91, there is no need to use an array slice on u.

In cell 92, z_exact is not an input parameter and should not be listed in the docstring.

In cell 95, you reference a temporary variable, z, which I don't think you mean to. Cell should read:

error_values = numpy.empty_like(dt_values)

for i, dt in enumerate(dt_values):
### call the function get_error() ###
error_values[i] = get_error(z_values[i], dt)

I can create a pull request or merge file if you like.

Lorena A. Barba
@labarba
You can pull request, and it will be reviewed or commented. We love to see open source dynamics on teaching materials!