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Combine two or more columns in a dataframe into a new column with a new name
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.@thelatemail - This worked for me: paste(df$n,df$s,sep="-")
– Chetan Arvind Patil
Oct 6 '17 at 19:09
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What exactly are iterator, iterable, and iteration?
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Iteration is a general term for taking each item of something, one after another. Any time you use a loop, explicit or implicit, to go over a group of items, that is iteration.
In Python, iterable and iterator have specific meanings.
An iterable is an object that has an __iter...
How do I flush the cin buffer?
...read in and ignore everything until EOF. (you can also supply a second argument which is the character to read until (ex: '\n' to ignore a single line).
Also: You probably want to do a: std::cin.clear(); before this too to reset the stream state.
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Remove multiple whitespaces
I'm getting $row['message'] from a MySQL database and I need to remove all whitespace like \n \t and so on.
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Shell script to send email [duplicate]
I am on linux machine and I monitor a process usage. Most of the time I will be away from my system and I have access to internet on my device. So I planned to write a shell-script that can mail me the output of the process.
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iOS detect if user is on an iPad
... can run on the Retina iPad and everything but there needs to be one adjustment. I need to detect if the current device is an iPad. What code can I use to detect if the user is using an iPad in my UIViewController and then change something accordingly?
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How to run mvim (MacVim) from Terminal?
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There should be a script named mvim in the root of the .bz2 file. Copy this somewhere into your $PATH ( /usr/local/bin would be good ) and you should be sorted.
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Assign an initial value to radio button as checked
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you can also just mention that attribute with no value assigned i.e.<input type="radio" checked>
– niksvp
Jan 17 '11 at 7:59
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Implicit “Submit” after hitting Done on the keyboard at the last EditText
I've used some apps where when I fill my username, then go to my password, if I hit "Done" on the keyboard, the login form is automatically submitted, without me having to click the submit button. How is this done?
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How to change UIPickerView height
Is it possible to change the height of UIPickerView? Some applications seem to have shorter PickerViews but setting a smaller frame doesn't seem to work and the frame is locked in Interface Builder.
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