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Determine the data types of a data frame's columns
...able):
str(my.data)
'data.frame': 5 obs. of 4 variables:
$ y : num 1.03 1.599 -0.818 0.872 -2.682
$ x1: int 1 2 3 4 5
$ x2: logi TRUE TRUE FALSE FALSE FALSE
$ X3: Factor w/ 5 levels "a","b","c","d",..: 1 2 3 4 5
@Gavin Simpson's approach is also streamlined, but provides slightly different...
How can I find the length of a number?
...ength. e.g. 2.5.toString().length outputs 3.
– dading84
Mar 2 '16 at 11:52
1
@dading84: i guess M...
Package cairo was not found in the pkg-config search path. Node j.s install canvas issue
...
This wont work in amzon ec2 instance, as they are not debian? any one know yum command for this
– Max
Feb 18 '16 at 13:20
5
...
IEnumerable to string [duplicate]
...haracter sequence on a 32-bit release build:
ToArrayString: 00:00:03.1695463
Concat: 00:00:07.2518054
StringBuilderChars: 00:00:03.1335455
StringBuilderStrings: 00:00:06.4618266
static readonly IEnumerable<char> seq = Enumerable.Repeat('a', 300);
static string ToArr...
Way to get all alphabetic chars in an array in PHP?
...|
edited Jan 11 '09 at 16:03
answered Jan 10 '09 at 23:05
P...
MySQL “between” clause not inclusive?
...ered Dec 9 '13 at 23:18
infinito84infinito84
1,3351212 silver badges88 bronze badges
...
CSS to line break before/after a particular `inline-block` item
...
@JMCCreative That's ASCII 0x0A, AKA a LF (line feed) character. See w3.org/TR/CSS2/syndata.html#strings
– Phrogz
Jan 5 '11 at 21:46
...
What does the restrict keyword mean in C++?
...y affects pointers of compatible types")
– idclev 463035818
Jun 9 '17 at 15:46
...
How to sum array of numbers in Ruby?
...
Try this:
array.inject(0){|sum,x| sum + x }
See Ruby's Enumerable Documentation
(note: the 0 base case is needed so that 0 will be returned on an empty array instead of nil)
...
How do I create a PDO parameterized query with a LIKE statement?
...wered Jan 30 '17 at 14:59
kjdion84kjdion84
6,12744 gold badges3737 silver badges5959 bronze badges
...
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