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Replace a value in a data frame based on a conditional (`if`) statement
...
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...
What is the type of lambda when deduced with “auto” in C++11?
...().
A lambda which captures no variables (nothing inside the []'s) can be converted into a function pointer (MSVC2010 doesn't support this, if that's your compiler, but this conversion is part of the standard).
But the actual type of the lambda isn't a function pointer. It's some unspecified funct...
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...
URLEncoder not able to translate space character
...ML forms.
From the javadocs:
This class contains static methods for
converting a String to the
application/x-www-form-urlencoded MIME
format.
and from the HTML Specification:
application/x-www-form-urlencoded
Forms submitted with this content type
must be encoded as follows...
How can I read numeric strings in Excel cells as string (not numbers)?
...llType call will loose formatting, as the javadocs explain the only way to convert to a String with formatting remaining is to use the DataFormatter class.
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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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Printing hexadecimal characters in C
...een promoted according to the integer promotions, but its value shall be
converted to signed char or unsigned char before printing); or that
a following
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What is @ModelAttribute in Spring MVC?
...request using the request.getParameter method.
once it reads them, it will convert them into the appropriate Java type using integer.parseInt, double.parseDouble and all the other parse methods that are available based on the data type of the data.
once parsed, it will create a object of the model ...
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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