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Getting and removing the first character of a string
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x <- 'hello stackoverflow'
substring(x, 2, nchar(x))
Idea is select all characters starting from 2 to number of characters in x. This is important when you have unequal number of characters in word or phrase.
Selecting the first letter is trivial as previous answers:
substring(x,1,1)
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Using a remote repository with non-standard port
...rl = [user@]host.xz:path/to/repo.git/
Notice that the SCP style does not allow a direct port change, relying instead on an ssh_config host definition in your ~/.ssh/config such as:
Host my_git_host
HostName git.some.host.org
Port 24589
User not_a_root_user
Then you can test in a shell with:
ss...
How to dynamically build a JSON object with Python?
I am new to Python and I am playing with JSON data. I would like to dynamically build a JSON object by adding some key-value to an existing JSON object.
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how to check the dtype of a column in python pandas
...ions to treat numeric columns and string columns. What I am doing now is really dumb:
6 Answers
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What's the difference between “Normal Reload”, “Hard Reload”, and ...
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@Grinn: Actually, now that I think of it, it's probably the entire cache. The point of that feature is to clear after-the-fact downloads, which aren't restricted to just one "site".
– Andrew Rasmussen
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fetch from origin with deleted remote branches?
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thank you very much. I manually deleted those branches before.
– Maksim Dmitriev
Mar 9 '13 at 13:16
4
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Test for equality among all elements of a single vector
I'm trying to test whether all elements of a vector are equal to one another. The solutions I have come up with seem somewhat roundabout, both involving checking length() .
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Proper use cases for Android UserManager.isUserAGoat()?
...changed in API 21.
/**
* Used to determine whether the user making this call is subject to
* teleportations.
* @return whether the user making this call is a goat
*/
public boolean isUserAGoat() {
return false;
}
It looks like the method has no real use for us as developers. Someone has ...
iOS: Compare two dates
...nclution that the best way of doing it is like this:
- (BOOL)isEndDateIsSmallerThanCurrent:(NSDate *)checkEndDate
{
NSDate* enddate = checkEndDate;
NSDate* currentdate = [NSDate date];
NSTimeInterval distanceBetweenDates = [enddate timeIntervalSinceDate:currentdate];
double secondsI...
Use of “this” keyword in formal parameters for static methods in C#
...is an extension method. See here for an explanation.
Extension methods allow developers to add new methods to the public
contract of an existing CLR type, without having to sub-class it or
recompile the original type. Extension Methods help blend the
flexibility of "duck typing" support p...