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Booleans, conditional operators and autoboxing
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4 Answers
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How do I retrieve the number of columns in a Pandas data frame?
...so:
import pandas as pd
df = pd.DataFrame({"pear": [1,2,3], "apple": [2,3,4], "orange": [3,4,5]})
len(df.columns)
3
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How to jQuery clone() and change id?
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214
$('#cloneDiv').click(function(){
// get the last DIV which ID starts with ^= "klon"
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Unique combination of all elements from two (or more) vectors
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141
this maybe what you are after
> expand.grid(a,b)
Var1 Var2
1 ABC 2012-05-01
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Disable intellij indexing on specific folder
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Map function in MATLAB?
...for numeric arrays:
>> y = arrayfun(@(x) x^2, 1:10)
y =
1 4 9 16 25 36 49 64 81 100
There are two other built-in functions that behave similarly: cellfun (which operates on elements of cell arrays) and structfun (which operates on each field of a structure)...
How do I draw a grid onto a plot in Python?
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edited Mar 20 '17 at 17:42
Peter Mortensen
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How can I filter a Django query with a list of values?
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From the Django documentation:
Blog.objects.filter(pk__in=[1, 4, 7])
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How to get the last element of a slice?
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edited Jan 1 '18 at 6:14
Benjamin W.
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Paperclip::Errors::MissingRequiredValidatorError with Rails 4
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Starting with Paperclip version 4.0, all attachments are required to include a content_type validation, a file_name validation, or to explicitly state that they're not going to have either.
Paperclip raises Paperclip::Errors::MissingRequiredValidatorErro...