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Extracting numbers from vectors of strings
...inding a set of numbers in the start and capturing them
as.numeric(gsub("([0-9]+).*$", "\\1", years))
or
# pattern is to just remove _years_old
as.numeric(gsub(" years old", "", years))
or
# split by space, get the element in first index
as.numeric(sapply(strsplit(years, " "), "[[", 1))
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Regular expression to match a word or its prefix
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140
Square brackets are meant for character class, and you're actually trying to match any one of: s...
Deleting a file in VBA
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170
1.) Check here. Basically do this:
Function FileExists(ByVal FileToTest As String) As Boolean...
Is there a better way to run a command N times in bash?
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for run in {1..10}
do
command
done
Or as a one-liner for those that want to copy and paste easily:
for run in {1..10}; do command; done
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How to pass in password to pg_dump?
...aragraph where it explains it will be ignored if you don't set the mode to 0600).
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Javascript: How to check if a string is empty? [duplicate]
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150
I check length.
if (str.length == 0) {
}
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C# How can I check if a URL exists/is valid?
I am making a simple program in visual c# 2005 that looks up a stock symbol on Yahoo! Finance, downloads the historical data, and then plots the price history for the specified ticker symbol.
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Save current directory in variable using Bash?
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edited Jul 18 '13 at 0:24
peakxu
6,1412424 silver badges2727 bronze badges
answered Nov 7 '12 at 17...
Can I run multiple versions of Google Chrome on the same machine? (Mac or Windows)
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103
In the comments, I mentioned a step-by-step method to easily install multiple Chrome versions, ...
Get type of a generic parameter in Java with reflection
...zedType)getClass().getGenericSuperclass())
.getActualTypeArguments()[0];
So there seems to be some reflection-magic around that I unfortunetly don't fully understand... Sorry.
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