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Pandas - How to flatten a hierarchical index in columns
I have a data frame with a hierarchical index in axis 1 (columns) (from a groupby.agg operation):
17 Answers
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How to print a number with commas as thousands separators in JavaScript
I am trying to print an integer in JavaScript with commas as thousands separators. For example, I want to show the number 1234567 as "1,234,567". How would I go about doing this?
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Why must a nonlinear activation function be used in a backpropagation neural network? [closed]
I've been reading some things on neural networks and I understand the general principle of a single layer neural network. I understand the need for aditional layers, but why are nonlinear activation functions used?
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What's the best way to send a signal to all members of a process group?
I want to kill a whole process tree. What is the best way to do this using any common scripting languages? I am looking for a simple solution.
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How to get the source directory of a Bash script from within the script itself?
How do I get the path of the directory in which a Bash script is located, inside that script?
67 Answers
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What do hjust and vjust do when making a plot using ggplot?
Every time I make a plot using ggplot, I spend a little while trying different values for hjust and vjust in a line like
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Animation CSS3: display + opacity
I have got a problem with a CSS3 animation.
15 Answers
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What is the fastest integer division supporting division by zero no matter what the result is?
Summary:
4 Answers
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Why is (object)0 == (object)0 different from ((object)0).Equals((object)0)?
Why are the following expressions different?
7 Answers
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Do you use NULL or 0 (zero) for pointers in C++?
In the early days of C++ when it was bolted on top of C, you could not use NULL as it was defined as (void*)0 . You could not assign NULL to any pointer other than void* , which made it kind of useless. Back in those days, it was accepted that you used 0 (zero) for null pointers.
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