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How to check if a column exists in Pandas
Is there a way to check if a column exists in a Pandas DataFrame?
3 Answers
3
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Changing font size and direction of axes text in ggplot2
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Drew SteenDrew Steen
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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 are the key differences between Apache Thrift, Google Protocol Buffers, MessagePack, ASN.1 and
All of these provide binary serialization, RPC frameworks and IDL. I'm interested in key differences between them and characteristics (performance, ease of use, programming languages support).
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How to check if a value exists in a dictionary (python)
...rns a different type of object, which may or may not be well suited for lookup operations:
>>> type(d.viewvalues())
<type 'dict_values'>
>>> type(d.values())
<type 'list'>
>>> type(d.itervalues())
<type 'dictionary-valueiterator'>
EDIT2: As per request...
vim repeat find next character 'x'
...igate in vim by f x to find next occurrence of character 'x',
but overlook that there is a word (or more words) containing 'x' in between the word I want to edit and the beginning cursor position.
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Facebook development in localhost
Just wanted to know if there is any way I could develop Facebook applications in localhost.
20 Answers
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Installing CocoaPods: no response
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For others wondering the same, installing the gem takes forever. If you run:
export GEM_HOME=~/.gems
export PATH=$GEM_HOME/bin:$PATH
gem install cocoapods -V
Installing with flag V enables verbose output which will let you see all the output as it is going through the down...
Ruby: How to iterate over a range, but in set increments?
So I'm iterating over a range like so:
4 Answers
4
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“Invalid form control” only in Google Chrome
The code below works well in Safari but in Chrome and Firefox the form will not submit. Chrome console logs the error An invalid form control with name='' is not focusable . Any ideas?
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