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Activity for Trevor
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Comment | Post #296356 |
That would work with the example I posted. But that is a minimal working example which I could easily solve that by hand. For even a slightly more complicated example example like this:
$$
\sqrt{b x_1^2 + b x_2^2 + b x_3^3} + 3 = a
$$
I would expect to get $a = 3 + \sqrt{b}$ and your suggeste... (more) |
— | 2 months ago |
| Edit | Post #296349 | Initial revision | — | 2 months ago |
| Question | — |
How to apply a unit constraint in SymPy The solution to this is probably easy, but I haven't been able to find it. Using SymPy, I am trying to solve this equation: $$ {x1}^2 + {x2}^2 + {x3}^2 + 3 = a $$ with this constraint: $$ {x1}^2 + {x2}^2 + {x3}^2 = 1 $$ It is obvious that $a=4$. So, I wrote this code: ```python impor... (more) |
— | 2 months ago |
| Edit | Post #295305 | Initial revision | — | 8 months ago |
| Question | — |
how to disable Python pdb's `Quitting pdb will kill the process. Quit anyway [y/n]?` prompt I'm running Python 3.14 in Linux. I have script with a `breakpoint()` in it, so when I run `$ python myscript.py`, it will take me into the `(Pdb)` prompt. Then, if I want to exit, I type `q` or do CTRL+D. It then shows this prompt: ``` Quitting pdb will kill the process. Quit anyway [y/n]? ``... (more) |
— | 8 months ago |
| Comment | Post #295296 |
Thanks, `setbufvar()` and `setwinvar()` are great, I knew there had to be some kind of vimscript functions equivalent to the `:set` command. However when I run `setbufvar(0,"&number",1)` Vim doesn't update and display the line numbers until I do some action in like move the cursor up a line. I al... (more) |
— | 8 months ago |
| Edit | Post #295294 | Initial revision | — | 8 months ago |
| Question | — |
how to run Vim's `:set` command using `vim --remote-expr` In Vim command-line mode, I can run `:set invnumber` to toggle line numbers on/off. Is there a way to run this command using the `$ vim --remote-expr {expr}` shell command? I know I can do this using `$ vim --remote-send ':set invnumber'`. But I want to know if I can do this using `vim --remote-e... (more) |
— | 8 months ago |
| Edit | Post #294139 | Initial revision | — | over 1 year ago |
| Answer | — |
A: how to update RPROMPT each time a key is pressed in zsh The cause of this problem is that `RPROMPT` has not yet been set when the `self-insert()` function is called. So the solution is to define `RPROMPT` as an empty string (`RPROMPT=""`) somewhere in your `.zshrc` file, in a place where it will get defined before ZLE is started. This solution cam... (more) |
— | over 1 year ago |
| Edit | Post #294065 |
Post edited: |
— | over 1 year ago |
| Edit | Post #294065 | Initial revision | — | over 1 year ago |
| Question | — |
how to update RPROMPT each time a key is pressed in zsh In zsh, I want to create a function that updates `RPROMPT` when I have typed `cd ..` into the terminal. As a starting point, I know I can, for example, add the `+` character to my `RBUFFER` when I have typed `cd ..` by adding the following to my `.zshrc`: ```zsh function self-insert() { zle ... (more) |
— | over 1 year ago |
| Edit | Post #293865 |
Post edited: grammar |
— | over 1 year ago |
| Edit | Post #293865 | Initial revision | — | over 1 year ago |
| Answer | — |
A: how to apply ANSI escape codes when a backslash precedes the escape code I figured out a solution myself. You can use two `echo` commands to print the two strings separately, where the `-n` option is used for the first string to prevent the insertion of a trailing newline at the end: ```shell $ var='test\' $ echo -n $var; echo '\e[41mNOTE\e[0m' ``` (more) |
— | over 1 year ago |
| Edit | Post #293864 | Initial revision | — | over 1 year ago |
| Question | — |
how to apply ANSI escape codes when a backslash precedes the escape code I am using ANSI escape codes in a shell script to colorize some parts of a string. For example, here I add the text `NOTE` with a red background color at the end of `$var`: ```shell $ var='test' $ echo $var'\e41mNOTE\e[0m' ``` ![good output This works as intended. However, if `$var` has... (more) |
— | over 1 year ago |
| Edit | Post #293744 |
Post edited: |
— | over 1 year ago |
| Edit | Post #293744 |
Post edited: |
— | over 1 year ago |
| Edit | Post #293744 |
Post edited: |
— | over 1 year ago |
| Edit | Post #293744 | Initial revision | — | over 1 year ago |
| Answer | — |
A: zsh - autocomplete with braces in the middle of a directory I figured out a solution myself. I'm not a zsh expert so this may be improved, but it works. 1) make a custom completion file for the diff command The completion file that zsh uses for the `diff` command is called `diff`. On my computer, this file is located at `/usr/share/zsh/functions/C... (more) |
— | over 1 year ago |
| Edit | Post #293473 | Initial revision | — | over 1 year ago |
| Question | — |
zsh - autocomplete with braces in the middle of a directory Suppose I have the following directory structure: ```txt folder/ aaa/ f.txt bbb/ f.txt ``` I want to compare the file `f.txt` as it is common to both directories. So in zsh I type this: ```console % diff folder/{aaa,bbb}/ ``` Pleasingly, zsh autocompletes both the `aaa` an... (more) |
— | over 1 year ago |
| Edit | Post #293085 | Initial revision | — | almost 2 years ago |
| Question | — |
how to save the line number of a double-clicked line in tmux In tmux I have the following command in my `.tmux.conf`, which will save a double-clicked line to the file `/tmp/tmuxline.txt`: ```tmux bind-key -n DoubleClick1Pane select-pane \; copy-mode -M \; send-keys -X select-line \; send-keys -X copy-pipe-and-cancel "cat > /tmp/tmuxline.txt" ``` Is th... (more) |
— | almost 2 years ago |
| Edit | Post #293072 | Initial revision | — | almost 2 years ago |
| Question | — |
how do I get markdown to render # as a shell prompt and not a comment? Note: This is a general question about Markdown formatting for any Markdown renderer (e.g., Gitlab, Github, Codidact). So this is not just a question about Codidact's renderer. When displaying shell commands in Markdown, I often want to use the hash sign (`#`) to indicate that I am running the... (more) |
— | almost 2 years ago |
| Edit | Post #292973 |
Post edited: |
— | almost 2 years ago |
| Edit | Post #292973 | Initial revision | — | almost 2 years ago |
| Question | — |
empty line in table cell in reStructuredText (rst) I would like to have an empty line in the cell of a table in reStructuredText. Consider the following example: ``` .. list-table:: :header-rows: 1 - aaa - bbb - ccc - ddd eee ``` Which produces this table: original rst table But I would like there to be a... (more) |
— | almost 2 years ago |
| Comment | Post #291820 |
Yeah this community might not be a perfect fit for this question, but it was the closest I could find out of all the Codidact & TopAnswers communities (I'm trying to avoid StackExchange). Since ffmpeg is multi-platform, I figured Linux wasn't the right community. (more) |
— | about 2 years ago |
| Edit | Post #291820 |
Post edited: |
— | about 2 years ago |
| Edit | Post #291820 | Initial revision | — | about 2 years ago |
| Question | — |
ffmpeg - concatenating identical audio-only files results in "non-montonic DTS" warning I am trying to join some video files and have an issue. I have boiled down the problem to the following minimal working example. I create a 2-second mp4 with a silent audio stream: ``` $ ffmpeg -f lavfi -i anullsrc -c:a aac -t 2 a.mp4 ``` I then create a file containing the file names to be... (more) |
— | about 2 years ago |
| Comment | Post #287851 |
Thank you for the suggestion (more) |
— | over 3 years ago |
| Edit | Post #287851 |
Post edited: |
— | over 3 years ago |
| Edit | Post #287851 | Initial revision | — | over 3 years ago |
| Question | — |
How to define an object with different subclasses in an if-statement? Note: I asked this question on TopAnswers a couple weeks ago, but didn't get any response, so I figured I'd ask it here. I am currently learning C++. I have a parent class (Vehicle) and two subclasses (Car and Boat). I am wondering how to create an object that will either be Car or Boat, d... (more) |
— | over 3 years ago |
| Edit | Post #286959 |
Post edited: |
— | about 4 years ago |
| Edit | Post #286959 | Initial revision | — | about 4 years ago |
| Answer | — |
A: ffmpeg: apply a filter from a start time to the end of the video I think I found a solution myself. Instead of using the `between()` function, you can use the `gte()` (greater than or equal to) function. So the command above would be: ``` ffmpeg -i video.mp4 -vf "yadif:enable='gte(t,30)'" output.mp4 ``` I discovered this command by looking through the FFmp... (more) |
— | about 4 years ago |
| Edit | Post #286958 | Initial revision | — | about 4 years ago |
| Question | — |
ffmpeg: apply a filter from a start time to the end of the video I'm using ffmpeg to apply a filter in between two time points. I am using the `between()` operator to specify the times. For example, to apply the yadif filter between 30 and 90 seconds I run: ``` ffmpeg -i video.mp4 -vf "yadif:enable='between(t,30,90)'" output.mp4 ``` However, I want to sp... (more) |
— | about 4 years ago |
| Edit | Post #286570 |
Post edited: made first sentence a little more specific |
— | over 4 years ago |
| Edit | Post #286570 | Initial revision | — | over 4 years ago |
| Question | — |
Vim: how to search for all instances of a string, except for those that are between two specific strings Using Vim, I am trying to search for all instances of a specific string, except for those that fall somewhere in between two other specific strings. For example, I want to determine all instances of `bird`, except for those that fall somewhere between `abc` and `xyz`. So in the text below, a s... (more) |
— | over 4 years ago |