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How to apply a function to two columns of Pandas dataframe
Suppose I have a df which has columns of 'ID', 'col_1', 'col_2' . And I define a function :
12 Answers
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List distinct values in a vector in R
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169
Do you mean unique:
R> x = c(1,1,2,3,4,4,4)
R> x
[1] 1 1 2 3 4 4 4
R> unique(x)
[1] ...
One-line list comprehension: if-else variants
...ssion you're returning for each element. Thus you need:
[ x if x%2 else x*100 for x in range(1, 10) ]
The confusion arises from the fact you're using a filter in the first example, but not in the second. In the second example you're only mapping each value to another, using a ternary-operator exp...
Column order manipulation using col-lg-push and col-lg-pull in Twitter Bootstrap 3
...'t even find the col-lg-push-x or pull classes in the original files for RC1 i downloaded, so check your bootstrap.css file. hopefully this is something they will sort out in RC2.
anyways, the col-push-* and pull classes did exist and this will suit your needs. Here is a demo
<div class="row"&g...
How can I use if/else in a dictionary comprehension?
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edited Mar 22 at 16:40
Peter Mortensen
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Import pandas dataframe column as string not int
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154
Just want to reiterate this will work in pandas >= 0.9.1:
In [2]: read_csv('sample.csv', d...
Returning first x items from array
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edited Jan 20 '15 at 6:20
answered Oct 15 '09 at 10:11
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Array slicing in Ruby: explanation for illogical behaviour (taken from Rubykoans.com)
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10 Answers
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validation custom message for rails 3
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196
Try this
validates :title, presence: { message: "Story title is required" }
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How to cast int to enum in C++?
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int i = 1;
Test val = static_cast<Test>(i);
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