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Replace a value in a data frame based on a conditional (`if`) statement
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Easier to convert nm to characters and then make the change:
junk$nm <- as.character(junk$nm)
junk$nm[junk$nm == "B"] <- "b"
EDIT: And if indeed you need to maintain nm as factors, add this in the end:
junk$nm <- as.factor...
Split (explode) pandas dataframe string entry to separate rows
... ZZ
6 x 2 ZZ
7 y 2 ZZ
using this little trick we can convert CSV-like column to list column:
In [48]: df.assign(var1=df.var1.str.split(','))
Out[48]:
var1 var2 var3
0 [a, b, c] 1 XX
1 [d, e, f, x, y] 2 ZZ
UPDATE: generic vectorized approa...
case-insensitive list sorting, without lowercasing the result?
...to match the lowercase 'b' when using casefold. This always happens if you convert case in order to compare: sorted(spam, key=str.lower) or sorted(spam, key=str.upper) or sorted(spam, key=str.casefold).
– PJ Singh
Jun 29 at 6:47
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What is the difference between JavaConverters and JavaConversions in Scala?
...collection , there are two very similar objects JavaConversions and JavaConverters .
4 Answers
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Get current time in seconds since the Epoch on Linux, Bash
... 1970) for any given date(e.g Oct 21 1973).
date -d "Oct 21 1973" +%s
Convert the number of seconds back to date
date --date @120024000
The command date is pretty versatile. Another cool thing you can do with date(shamelessly copied from date --help).
Show the local time for 9AM next Fr...
Add a custom attribute to a Laravel / Eloquent model on load?
...kes ->available available on the $session object, but as $sessions gets converted directly into a JSON string (it's part of an API), there isn't a chance to use this.
– coatesap
Jun 21 '13 at 13:28
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Hidden features of Ruby
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Another tiny feature - convert a Fixnum into any base up to 36:
>> 1234567890.to_s(2)
=> "1001001100101100000001011010010"
>> 1234567890.to_s(8)
=> "11145401322"
>> 1234567890.to_s(16)
=> "499602d2"
>> 123456789...
How do I get Windows to go as fast as Linux for compiling C++?
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Unless a hardcore Windows systems hacker comes along, you're not going to get more than partisan comments (which I won't do) and speculation (which is what I'm going to try).
File system - You should try the same operations (including the dir) on th...
Can't seem to discard changes in Git
...then this is the problem you are seeing.
core.autocrlf
If true, makes git convert CRLF at the end of lines in text files to LF
when reading from the filesystem, and
convert in reverse when writing to the
filesystem. The variable can be set to
input, in which case the conversion
happens only while r...
Preserve line breaks in angularjs
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I tried converting all \n's over to <br/>'s and then of course these tags weren't being rendered as HTML markup...after all this converting found your style solution and this is an incredible help and simplification...now I don...