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How to sum a variable by group
... Is there anyway of maintaining an ID column? Say the categories are ordered and the ID column is 1:nrow(df), is it possible to keep the starting position of each category after aggregating? So the ID column would end up as, for example, 1, 3, 4, 7 after collapsing with aggregate. In my case ...
How do I update a Python package?
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In order to work on an Ubuntu 18.04 venv adapt as follows: pip install $(pip list --outdated | tail +3 | grep -v sdist | awk '{ print $1 }') --upgrade
– Alexander Remesch
Feb 16 at 6:15
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Using HTML in Express instead of Jade
... </body>
PS - No need to close HTML - that's done automagically by Jade.
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Equivalent of “throw” in R
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Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
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autolayout - make height of view relative to half superview height
...een getting into autolayouts recently and I'm stuck on what seems like a really trivial problem example. I have a view that I want to sit at the top of the screen, and take up half of the screen-height. Simple before autolayout - just tack it in place and tell it to expand vertically when the superv...
Converting a view to Bitmap without displaying it in Android?
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there is a way to do this. you have to create a Bitmap and a Canvas and call view.draw(canvas);
here is the code:
public static Bitmap loadBitmapFromView(View v) {
Bitmap b = Bitmap.createBitmap( v.getLayoutParams().width, v.getLayoutParams().height, Bitmap.Config.ARGB_8888); ...
Remove all special characters, punctuation and spaces from string
I need to remove all special characters, punctuation and spaces from a string so that I only have letters and numbers.
16 A...
Like Operator in Entity Framework?
...attern in a specified expression, or zeros if the pattern is not found, on all valid text and character data types
Namespace: System.Data.Objects.SqlClient
Assembly: System.Data.Entity (in System.Data.Entity.dll)
A bit of an explanation also appears in this forum thread.
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C# properties: how to use custom set property without private field?
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What's the difference between this and not having set at all?
– Sidhin S Thomas
Nov 11 '19 at 16:59
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Cancel split window in Vim
...ocused window. I think this is the functionality you are looking for.
In order to navigate between windows type Ctrl+w followed by a navigation key (h,j,k,l, or arrow keys)
For more information run :help window and :help hide in vim.
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