大约有 11,000 项符合查询结果（耗时：0.0217秒） [XML]
Fastest way to replace NAs in a large data.table
...ows and 200 columns. I would like to re code those NA values to zeros as efficiently as possible.
10 Answers
...
How to perform file system scanning
...
EDIT: Enough people still hit this answer, that I thought I'd update it for the Go1 API. This is a working example of filepath.Walk(). The original is below.
package main
import (
"path/filepath"
"os"
"flag"
"fmt"
)
func visit(path string, f os.FileInfo, err error) error {
fmt.Prin...
How do I list the functions defined in my shell?
I can type alias to show a list of all the aliases.
8 Answers
8
...
Best way to represent a fraction in Java?
I'm trying to work with fractions in Java.
26 Answers
26
...
Python 3: UnboundLocalError: local variable referenced before assignment [duplicate]
The following code gives the error UnboundLocalError: local variable 'Var1' referenced before assignment :
5 Answers
...
Understanding the Use of ColorMatrix and ColorMatrixColorFilter to Modify a Drawable's Hue
I'm working on a UI for an app, and I'm attempting to use grayscale icons, and allow the user to change the theme to a color of their choosing. To do this, I'm trying to just apply a ColorFilter of some sort to overlay a color on top of the drawable. I've tried using PorterDuff.Mode.MULTIPLY, and it...
What is 'Currying'?
I've seen references to curried functions in several articles and blogs but I can't find a good explanation (or at least one that makes sense!)
...
What is the difference between assert, expect and should in Chai?
What is the difference between assert , expect and should , and when to use what?
2 Answers
...
Split delimited strings in a column and insert as new rows [duplicate]
I have a data frame as follow:
6 Answers
6
...
How can I output a UTF-8 CSV in PHP that Excel will read properly?
...but it's got to be UTF-8. I open this file in TextEdit or TextMate or Dreamweaver and it displays UTF-8 characters properly, but if I open it in Excel it's doing this silly íÄ kind of thing instead. Here's what I've got at the head of my document:
...