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PostgreSQL naming conventions
... case, etc, the prevalent convention is:
SQL keywords: UPPER CASE
names (identifiers): lower_case_with_underscores
For example:
UPDATE my_table SET name = 5;
This is not written in stone, but the bit about identifiers in lower case is highly recommended, IMO. Postgresql treats identifiers cas...
Does the ternary operator exist in R?
...gt; x
[1] 1 2 1
> x <- ifelse(a==2, 1, 2)
> x
[1] 2 1 2
Just kidding, you can define c-style ?::
`?` <- function(x, y)
eval(
sapply(
strsplit(
deparse(substitute(y)),
":"
),
function(e) parse(text = e)
...
How to do a scatter plot with empty circles in Python?
...the colored disks already plotted by scatter() , so as to highlight them, ideally without having to redraw the colored circles.
...
Delete from the current cursor position to a given line number in vi editor
...ast line you want to delete and mark it by typing ma which "marks" it with identifier "a". Then go up to the top line that you want to delete and type d'a for delete to mark "a". Bam!
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Python OpenCV2 (cv2) wrapper to get image size?
...other than numpy.shape() . How can I get it in these format dimensions: (width, height) list?
2 Answers
...
“int main (vooid)”? How does that work?
... and, in the process, I made a spelling mistake in the main function by accidentally using vooid instead of void .
4 Ans...
How to retrieve Request Payload
... it. Then it will be no different than an array from Input::all(); On a side not this would probably work for everyone else too.
– Michael J. Calkins
Mar 30 '13 at 16:28
...
cd into directory without having permission
...es you may want to allow group to create files in your directory - but consider using the sticky bit on the directory if you do).
If it is someone else's directory, you'll probably need some help from the owner to change the permissions so that you can access it (or you'll need help from root to ch...
How to print formatted BigDecimal values?
... var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled...
AWS Difference between a snapshot and AMI
...priate metadata. The trickiest part of this is specifying the correct AKI id (kernel) so that it boots correctly.
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