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How to create a printable Twitter-Bootstrap page
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If you're already using this stylesheet, chances are you have you currently have media="screen", which will not be seen by a printer. You ca...
How to use filter, map, and reduce in Python 3
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352
You can read about the changes in What's New In Python 3.0. You should read it thoroughly when...
Actual examples for HATEOAS (REST-architecture) [closed]
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trendelstrendels
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How can I convert NSDictionary to NSData and vice versa?
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363
NSDictionary -> NSData:
NSData *myData = [NSKeyedArchiver archivedDataWithRootObject:myDi...
MySQL foreign key constraints, cascade delete
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Split column at delimiter in data frame [duplicate]
...me.
I added a "x|y" line to avoid ambiguities:
df <- data.frame(ID=11:13, FOO=c('a|b','b|c','x|y'))
foo <- data.frame(do.call('rbind', strsplit(as.character(df$FOO),'|',fixed=TRUE)))
Or, if you want to replace the columns in the existing data.frame:
within(df, FOO<-data.frame(do.call('r...
What do ellipsis […] mean in a list?
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113
It means that you created an infinite list nested inside itself, which can not be printed. p co...
“Inner exception” (with traceback) in Python?
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138
Python 2
It's simple; pass the traceback as the third argument to raise.
import sys
class MyE...
How to count the number of true elements in a NumPy bool array
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3 Answers
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