FAQ
This is a place for questions that do not fit on any of our topical FAQ/Help pages, which you can find on the FAQ/Help portal.
Remember: if you don't find what you need, or if you'd like to ask a question, then please email [email protected] at any time. We'd love to hear from you! Please include a link (the URL address in your browser) to any relevant project or document, as part of your email.
List of Questions:
- What tools are available for course management?
- How can I use Python3 by default in Sage worksheets?
- I created an ssh key in my project; how do I easily copy it?
- How can I download a whole directory?
- Can I pay with Paypal?
- If I have a license for proprietary software, can I run it in a CoCalc project?
- How can I clear the scrollback buffer in a terminal without deleting the terminal?
- CoCalc keeps saying that my clock is off. What should I do?
- I created an account with the same email used to invite me to collaborate on a project. However, when I follow the link to open the project, I get the following message, "Showing only public files"
- Is it possible to nest cells in a CoCalc document (e.g., a sagews)?
- Can I split the CoCalc browser tab to view two files, and not just two views of the same file?
- How long can a project be idle before it is sent to long term storage?
- How can I use Vim inside a terminal? some shortcuts are grabbed by the browser.
- What if my question isn't answered above?
See the tutorial for anyone wanting to use CoCalc for teaching.
There is also an entire FAQ dedicated to Course management.
First, try putting this in a cell of a Sage worksheet:
%auto
%default_mode python3
Then the rest of that worksheet will use Python3.
If you make a sage worksheet called
templates/linux/default.sagews
with the above content, it'll be used by default whenever you open a new worksheet in that project. You can create the above file quickly by navigating to your home directory in the file browser, then pasting the above in filename search in the upper left.
If you type ssh-keygen in a terminal, then you'll generate an ssh key, which you might use with github (say) or sage's trac to easily push and pull to repositories. To copy this ssh key, you could type cat .ssh/id_rsa.pub and copy in the terminal, but you'll have to manually delete a bunch of newlines. Alternatively, do the following:
-
In the project file list, click on the icon that looks like an eye in the middle on the right side of the screen to reveal hidden files (those that start with a dot).
-
Click on the
.sshdirectory -- you can easily find it by typing "ssh" in the search box labeled "choose files..." on the left. -
Click on
id_rsa.pub, then highlight everything and copy as usual. -
Click the eye again to turn off viewing hidden files.
Alternatively, type this into the small "terminal command" box in "files": cat ~/.ssh/*.pub. Below the box, you can conveniently copy/paste it!
You can also type the following into a full terminal: open ~/.ssh/id_rsa.pub
There is currently no provision to download an entire directory.
To accomplish this, you can easily create a .zip-archive.
Above the files view, on the right, there is a command-box.
For a directory called "My Homework", type in:
zip download-homework.zip "My Homework"
The directory name needs to be exactly the same, including upper and lowercase letters, and any space characters need to be protected by quoting the entire name.
If successful, a new file download-homework.zip should appear.
YES The only restriction is that because it is a manual process, at this time, we can accept only paypal for course subscriptions and 1-year subscriptions.
E-mail [email protected] to set this up.
CoCalc runs on virtual computers in Google Compute Engine (Google’s cloud), on Ubuntu Linux. If you have a valid license to run software, it may be possible to install and run it on CoCalc.
In a "plain" terminal, type in "reset". That's command tells the terminal to reinitialize itself. This should clear the buffer, too.
If you use tmux or another multiplexer, it sits on top of that terminal interface. There, you run "reset" and then close and reopen the terminal tab.
In both cases, the terminal file, the session and chat is still there and you didn't lose any history.
See the CoCalc troubleshooting guide: CoCalc says your clock is off
I created an account with the same email used to invite me to collaborate on a project. However, when I follow the link to open the project, I get the following message, "Showing only public files".
Invitations expire after 14 days. Ask the project owner to invite you again.
It's not. HOWEVER, it is at least possible to have several different sagews files and easily link between them using markdown links. E.g., to link to a.sagews, do this:
%md
[a](a.sagews)
This is not currently possible, except by opening two browser tabs. That said, we are working on adding this functionality, and it will be coming soon.
The current setting is for idle projects to be archived after 31 days. That number could change, as needed.
One way is to change the keys vim responds to. Place the following in your $HOME/.vimrc:
" When running cocalc under firefox ctrl-w (close tab/window) is unavailable. Remap it to ctrl-e
nnoremap <C-e> <C-w>
" Likewise remap the completion (new window) to ctrl-f
inoremap <C-f> <C-n>
Email [email protected] with lots of details about your question. Do not hesitate to immediately email us, because we are eager to hear from you!