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How to Correctly Use Lists in R?
...st?) contemporary programming languages in widespread use have at least a handful of ADTs [abstract data types] in common, in particular,
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Check if database exists in PostgreSQL using shell
...rows" will succeed. So we pipe this output through a bunch of built-in command line tools to only search in the first column.
The -t flag removes headers and footers:
my_db | my_user | UTF8 | en_US.UTF8 | en_US.UTF8 |
postgres | postgres | LATIN1 | en_US | en_US |
te...
Getting an object from an NSSet
...containsObject to test for membership, use anyObject to get a member (not random), or convert it to an array (in no particular order) with allObjects.
A set is appropriate when you don't want duplicates, don't care about order, and want fast membership testing.
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Remove the last character from a string [duplicate]
...
First, I try without a space, rtrim($arraynama, ","); and get an error result.
Then I add a space and get a good result:
$newarraynama = rtrim($arraynama, ", ");
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imp...
Decreasing height of bootstrap 3.0 navbar
...28px; }
Work with Bootstrap 3.3.4
.navbar-nav > li > a, .navbar-brand {
padding-top:4px !important;
padding-bottom:0 !important;
height: 28px;
}
.navbar {min-height:28px !important;}
Update
Complete code to customize and decrease height of navbar with screenshot.
CSS:
/* ...
mkdir's “-p” option
...oes in Unix. I used it for a lab assignment while creating a subdirectory and then another subdirectory within that one. It looked like this:
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Converting NumPy array into Python List structure?
...nvert a NumPy array to a Python List (for example [[1,2,3],[4,5,6]] ), and do it reasonably fast?
5 Answers
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DateTime.ToString(“MM/dd/yyyy HH:mm:ss.fff”) resulted in something like “09/14/2013 07.20.31.371”
...Your user must be in a culture where the time separator is a dot. Both ":" and "/" are interpreted in a culture-sensitive way in custom date and time formats.
How can I make sure the result string is delimited by colon instead of dot?
I'd suggest specifying CultureInfo.InvariantCulture:
strin...
Extract hostname name from string
I would like to match just the root of a URL and not the whole URL from a text string. Given:
27 Answers
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Trying to embed newline in a variable in bash [duplicate]
...n the source code
p="${var1}
${var2}"
echo "${p}"
Using $'\n' (only bash and zsh)
p="${var1}"$'\n'"${var2}"
echo "${p}"
Details
1. Inserting \n
p="${var1}\n${var2}"
echo -e "${p}"
echo -e interprets the two characters "\n" as a new line.
var="a b c"
first_loop=true
for i in $var
do
p="...