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What is the difference between Caching and Memoization?
...ce between caching and memoization is.
As I see it, both involve avoiding repeated function calls to get data by storing it .
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How can I extract a good quality JPEG image from a video file with ffmpeg?
... -i input.mp4 -qscale:v 4 -frames:v 1 output.jpg
This will work with any video input. See below if your input is MJPEG.
MJPEG
If your input is MJPEG (Motion JPEG) then the images can be extracted without any quality loss.
The ffmpeg or ffprobe console output can tell you if your input is MJPEG:
$ ...
How do I use vi keys in ipython under *nix?
... it is: ESC+CTRL+j. To switch back to Emacs mode one can use C-e but that didn't appear to work for me - I had to instead do M-C-e - on my Mac it is: ESC+CTRL+e.
FYI my ~/.inputrc is set up as follows:
set meta-flag on
set input-meta on
set convert-meta off
set output-meta on
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What does each of the [y,n,q,a,d,/,K,j,J,g,e,?] stand for in context of git -p
...ch for a hunk matching the given regex
j - leave this hunk undecided, see next undecided hunk
J - leave this hunk undecided, see next hunk
k - leave this hunk undecided, see previous undecided hunk
K - leave this hunk undecided, see previous hunk
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[A]System.Web.WebPages.Razor.Configuration.HostSection cannot be cast to… web.config issue
...versions from 2.0.0.0 to 3.0.0.0 of the following section of Web.config resides inside the View folder of my project.
<configSections>
<sectionGroup name="system.web.webPages.razor" type="System.Web.WebPages.Razor.Configuration.RazorWebSectionGroup, System.Web.WebPages.Razor, Version=3.0.0...
How to get VM arguments from inside of Java application?
... answered Oct 7 '09 at 14:32
David SchulerDavid Schuler
1,96611 gold badge1111 silver badges66 bronze badges
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Effect of a Bitwise Operator on a Boolean in Java
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If the above is true, why is ideone.com/oGSF7c throwing a null pointer exception? If the |= operator was logical, the program should never have run the x.getValue() directive.
– ikromm
Feb 5 '15 at 12:34
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Extract substring using regexp in plain bash
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Thanks for the detailed explanation, helps to avoid future "how do I regexp XXXX" posts.
– studgeek
Feb 8 '17 at 20:23
4
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Grepping a huge file (80GB) any way to speed it up?
...from the following filename. Similar to cat file.sql | parallel ... but avoids a UUOC. GNU parallel also has a way to read input from a file using parallel ... :::: file.sql. HTH.
– Steve
Oct 21 '19 at 21:26
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Iterate over the lines of a string
...t with other functions').
But the split-based approach still rules.
An aside: possibly better style for f4 would be:
from cStringIO import StringIO
def f4(foo=foo):
stri = StringIO(foo)
while True:
nl = stri.readline()
if nl == '': break
yield nl.strip('\n')
at ...