大约有 46,000 项符合查询结果（耗时：0.1088秒） [XML]
The $.param( ) inverse function in JavaScript / jQuery
...
ccecce
3,73422 gold badges2424 silver badges2424 bronze badges
...
How to randomize (or permute) a dataframe rowwise and columnwise?
...
234
Given the R data.frame:
> df1
a b c
1 1 1 0
2 1 0 0
3 0 1 0
4 0 0 0
Shuffle row-wise:
&...
How to validate date with format “mm/dd/yyyy” in JavaScript?
...tring)
{
// First check for the pattern
if(!/^\d{1,2}\/\d{1,2}\/\d{4}$/.test(dateString))
return false;
// Parse the date parts to integers
var parts = dateString.split("/");
var day = parseInt(parts[1], 10);
var month = parseInt(parts[0], 10);
var year = parseIn...
Calculating Pearson correlation and significance in Python
... |
edited Apr 5 '17 at 18:44
Martin Thoma
81.2k102102 gold badges454454 silver badges700700 bronze badges
...
What's the difference between session.Merge and session.SaveOrUpdate?
...
Õzbek
13.8k1010 gold badges4747 silver badges8383 bronze badges
answered Oct 4 '08 at 21:20
David CrowDavid Crow
...
How do I make curl ignore the proxy?
...
|
edited Dec 1 '14 at 22:09
Petah
41.4k2626 gold badges147147 silver badges199199 bronze badges
...
How do I combine two data-frames based on two columns? [duplicate]
...final example given in the documentation:
x <- data.frame(k1=c(NA,NA,3,4,5), k2=c(1,NA,NA,4,5), data=1:5)
y <- data.frame(k1=c(NA,2,NA,4,5), k2=c(NA,NA,3,4,5), data=1:5)
merge(x, y, by=c("k1","k2")) # NA's match
This example was meant to demonstrate the use of incomparables, but it illustra...
ViewController respondsToSelector: message sent to deallocated instance (CRASH)
...
JohnnywhoJohnnywho
5,54122 gold badges2424 silver badges2020 bronze badges
...
pandas GroupBy columns with NaN (missing) values
...ng the groupby (e.g. -1):
In [11]: df.fillna(-1)
Out[11]:
a b
0 1 4
1 2 -1
2 3 6
In [12]: df.fillna(-1).groupby('b').sum()
Out[12]:
a
b
-1 2
4 1
6 3
That said, this feels pretty awful hack... perhaps there should be an option to include NaN in groupby (see this github i...
Bootstrap combining rows (rowspan)
...
Paul KeisterPaul Keister
12k44 gold badges4141 silver badges7070 bronze badges
...