* open-pipe* seems to buffer all of my writes when I don't want it.
@ 2021-01-15 4:56 Tim Meehan
2021-01-15 9:16 ` tomas
0 siblings, 1 reply; 3+ messages in thread
From: Tim Meehan @ 2021-01-15 4:56 UTC (permalink / raw)
To: guile-user
I was trying to use Matplotlib to plot some data, through a call to
"open-pipe*" ... I'm trying to slowly rewrite some of my tools in Scheme.
When I run the program from the shell with "python -i plotter.py" I can
send it updates ... but when I run it through Guile, it seems to store up
all of my updates, then right before the program closes a window pops up
for a fraction of a second and then vanishes. Am I using "open-pipe*"
incorrectly?
#!/usr/bin/guile
!#
(use-modules (ice-9 popen)
(ice-9 readline)
(ice-9 textual-ports))
(define program (string-concatenate
'("import scipy.special\n"
"import matplotlib.pyplot as plt\n"
"import numpy as np\n"
"x = np.linspace(0, 10)\n"
"y0 = scipy.special.jv(0, x)\n"
"def update_data():\n"
" print('updating')\n"
" noise = np.random.randn(y0.size)*0.1\n"
" line1.set_ydata(y0 + noise)\n"
" plt.pause(0.1)\n"
"fig, ax = plt.subplots(1, 2)\n"
"ax[0].plot(x, y0)\n"
"ax[0].set_title('Original Data')\n"
"ax[0].set_xlabel('X')\n"
"ax[0].set_ylabel('Y')\n"
"ax[1].plot(x, y0)\n"
"line1, = ax[1].plot(x, y0, '.')\n"
"ax[1].set_title('Noisy Data')\n"
"ax[1].set_xlabel('X')\n"
"ax[1].set_ylabel('Y')\n"
"fig.show()\n"
"plt.pause(0.1)\n")))
(define prompt "update? ('quit' to stop')")
(define stuff (open-pipe* OPEN_WRITE "python3"))
(setvbuf stuff 'none)
(put-string stuff program)
(force-output stuff)
(let loop ([command (readline prompt)])
(unless (string-prefix? "quit" command)
(display "updating\n")
(put-string stuff "update_data()\n")
(loop (readline prompt))))
(close-pipe stuff)
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: open-pipe* seems to buffer all of my writes when I don't want it.
2021-01-15 4:56 open-pipe* seems to buffer all of my writes when I don't want it Tim Meehan
@ 2021-01-15 9:16 ` tomas
2021-01-16 2:39 ` Tim Meehan
0 siblings, 1 reply; 3+ messages in thread
From: tomas @ 2021-01-15 9:16 UTC (permalink / raw)
To: Tim Meehan; +Cc: guile-user
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On Thu, Jan 14, 2021 at 10:56:42PM -0600, Tim Meehan wrote:
> I was trying to use Matplotlib to plot some data, through a call to
> "open-pipe*" ... I'm trying to slowly rewrite some of my tools in Scheme.
>
> When I run the program from the shell with "python -i plotter.py" I can
> send it updates ... but when I run it through Guile, it seems to store up
> all of my updates [...]
Warning: untested. But perhaps you need to put a `force-output'...
[...]
> (put-string stuff program)
> (force-output stuff)
>
> (let loop ([command (readline prompt)])
> (unless (string-prefix? "quit" command)
> (display "updating\n")
> (put-string stuff "update_data()\n")
... around here?
> (loop (readline prompt))))
>
> (close-pipe stuff)
(I'm still surprised that setting the buffer to 'none didn't help).
Cheers
- t
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: open-pipe* seems to buffer all of my writes when I don't want it.
2021-01-15 9:16 ` tomas
@ 2021-01-16 2:39 ` Tim Meehan
0 siblings, 0 replies; 3+ messages in thread
From: Tim Meehan @ 2021-01-16 2:39 UTC (permalink / raw)
To: tomas; +Cc: guile-user
I tried the force output right there. It still doesn’t pop up the window until you type “quit,” it then shows the window for a while (because of the Python pause calls).
Thanks for looking at it
> On Jan 15, 2021, at 03:16, tomas@tuxteam.de wrote:
>
> On Thu, Jan 14, 2021 at 10:56:42PM -0600, Tim Meehan wrote:
>> I was trying to use Matplotlib to plot some data, through a call to
>> "open-pipe*" ... I'm trying to slowly rewrite some of my tools in Scheme.
>>
>> When I run the program from the shell with "python -i plotter.py" I can
>> send it updates ... but when I run it through Guile, it seems to store up
>> all of my updates [...]
>
> Warning: untested. But perhaps you need to put a `force-output'...
>
> [...]
>> (put-string stuff program)
>> (force-output stuff)
>>
>> (let loop ([command (readline prompt)])
>> (unless (string-prefix? "quit" command)
>> (display "updating\n")
>> (put-string stuff "update_data()\n")
>
> ... around here?
>
>> (loop (readline prompt))))
>>
>> (close-pipe stuff)
>
> (I'm still surprised that setting the buffer to 'none didn't help).
>
> Cheers
> - t
^ permalink raw reply [flat|nested] 3+ messages in thread
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