大约有 5,229 项符合查询结果（耗时：0.0347秒） [XML]
Remove unwanted parts from strings in a column
...r.replace(r'\D', '').astype(int)
df.dtypes
time object
result int64
dtype: object
If you don't want to modify df in-place, use DataFrame.assign:
df2 = df.assign(result=df['result'].str.replace(r'\D', ''))
df
# Unchanged
.str.extract
Useful for extracting the substring(s) you want t...
What are good grep tools for Windows? [closed]
...ommendations on grep tools for Windows? Ideally ones that could leverage 64-bit OS.
28 Answers
...
How to wait for a keypress in R?
... arulmr
7,23866 gold badges4444 silver badges6464 bronze badges
answered Sep 11 '13 at 16:27
nnnnnn
4,15133 gold badges2020...
Force R to stop plotting abbreviated axis labels - e.g. 1e+00 in ggplot2
...
64
Did you try something like :
options(scipen=10000)
before plotting ?
...
Input size vs width
...https://fonts.gstatic.com/s/opensanscondensed/v11/gk5FxslNkTTHtojXrkp-xBEur64QvLD-0IbiAdTUNXE.woff2) format('woff2');
unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2212, U+2215;
}
p {
margin: 0 0 10px 0;
}
input {
font-size: 20...
How to find gaps in sequential numbering in mysql?
...-------+
| 1 thru 99 |
| 666 thru 667 |
| 50000 |
| 66419 thru 66456 |
+------------------+
4 rows in set (0.06 sec)
Note that the order of columns expected and got is critical.
If you know that YourCol doesn't start at 1 and that doesn't matter, you can replace
(SELECT @ro...
Why does string::compare return an int?
.... But sure, someone dealing with a string containing a MPEG encoded as Base64 or some such may well run into that problem...
– Mats Petersson
Mar 11 '13 at 21:36
...
How are feature_importances in RandomForestClassifier determined?
... description here
We can get compute_feature_importance:[0. ,0.01333333,0.06405596,0.92261071]
Check source code:
cpdef compute_feature_importances(self, normalize=True):
"""Computes the importance of each feature (aka variable)."""
cdef Node* left
cdef Node* right
cdef Node* nodes ...
Is there a performance gain in using single quotes vs double quotes in ruby?
...
$ ruby -v
ruby 1.9.3p0 (2011-10-30 revision 33570) [x86_64-darwin11.0.0]
$ cat benchmark_quotes.rb
# As of Ruby 1.9 Benchmark must be required
require 'benchmark'
n = 1000000
Benchmark.bm(15) do |x|
x.report("assign single") { n.times do; c = 'a string'; end}
x.report("assig...
Avoid trailing zeroes in printf()
...n numbers get bigger... but basically typecasting to long, long long or int64 should work.
– Juha
Oct 10 '14 at 18:41
|
show 2 more comments...