大约有 1,900 项符合查询结果（耗时：0.0248秒） [XML]
Get statistics for each group (such as count, mean, etc) using pandas GroupBy?
...24
two 1.0 -0.98 NaN -0.98 -0.98 -0.98 -0.98 -0.98
foo one 2.0 1.36 0.58 0.95 1.15 1.36 1.56 1.76
three 1.0 -0.15 NaN -0.15 -0.15 -0.15 -0.15 -0.15
two 2.0 1.42 0.63 0.98 1.20 1.42 1.65 1.87
To get specific statistics, just select them,
df.groupby(['A...
Using Sinatra for larger projects via multiple files
...nd
end
helpers/nicebytes.rb
# encoding: utf-8
module NiceBytes
K = 2.0**10
M = 2.0**20
G = 2.0**30
T = 2.0**40
def nice_bytes( bytes, max_digits=3 )
value, suffix, precision = case bytes
when 0...K
[ bytes, 'B', 0 ]
else
value, suffix = case bytes
...
How do I get the first element from an IEnumerable in .net?
...
Just in case you're using .NET 2.0 and don't have access to LINQ:
static T First<T>(IEnumerable<T> items)
{
using(IEnumerator<T> iter = items.GetEnumerator())
{
iter.MoveNext();
return iter.Current;
}
...
Should everything really be a bundle in Symfony 2.x?
...plate guesser service, but since the approach is different between Symfony 2.0 and 2.1, I'm providing versions for both of them.
Overriding the Symfony 2.1+ template guesser
I've created a bundle that does that for you.
Overriding the Symfony 2.0 template listener
First, define the class:
<?php
n...
Where can I learn how to write C code to speed up slow R functions? [closed]
...tic function:
Rcpp::NumericVector x = Rcpp::NumericVector::create( 1.0, 2.0, 3.0 ) ;
Rcpp::NumericVector x = Rcpp::NumericVector::create(
_["a"] = 1.0,
_["b"] = 2.0,
_["c"] = 3
) ;
Of a given size:
Rcpp::NumericVector x( 10 ) ; // filled with 0.0
Rcpp::NumericVector x(...
What is the most pythonic way to check if an object is a number?
...decimal import Decimal
... from fractions import Fraction
... for n in [2, 2.0, Decimal('2.0'), complex(2, 0), Fraction(2, 1), '2']:
... print(f'{n!r:>14} {isinstance(n, Number)}')
2 True
2.0 True
Decimal('2.0') True
(2+0j) True
Fraction(2, 1) True
...
Changing UIImage color
...deAlwaysTemplate];
[theImageView setTintColor:[UIColor redColor]];
Swift 2.0:
theImageView.image = theImageView.image?.imageWithRenderingMode(.AlwaysTemplate)
theImageView.tintColor = UIColor.magentaColor()
Swift 4.0:
theImageView.image = theImageView.image?.withRenderingMode(.alwaysTemplate)...
Reusable library to get human readable version of file size?
...e examples using the data from the OP: humanize.naturalsize(2048) # => '2.0 kB' , humanize.naturalsize(2048, binary=True) # => '2.0 KiB' humanize.naturalsize(2048, gnu=True) # => '2.0K'
– RubenLaguna
Jan 27 '16 at 10:10
...
How do you sort a dictionary by value?
...pair1.Value.CompareTo(pair2.Value);
}
);
Since you're targeting .NET 2.0 or above, you can simplify this into lambda syntax -- it's equivalent, but shorter. If you're targeting .NET 2.0 you can only use this syntax if you're using the compiler from Visual Studio 2008 (or above).
var myList ...
Creating dataframe from a dictionary where entries have different lengths
... mydict.items() })
>>> dict_df
one 2 3
0 1.0 4 8.0
1 2.0 5 NaN
2 3.0 6 NaN
3 NaN 7 NaN
A similar syntax exists for lists, too:
>>> mylist = [ [1,2,3], [4,5], 6 ]
>>> list_df = pd.DataFrame([ pd.Series(value) for value in mylist ])
>>> lis...