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database - data block size in HDFS, why 64MB?

The default data block size of HDFS/hadoop is 64MB. The block size in disk is generally 4KB. What does 64MB ... original 4KB block size in disk? See Question&Answers more detail:os...

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jQuery select by attribute using AND and OR operators

I'm thinking about, if it is possible in jQuery to select elements by named attributes using AND and ... writing special filter functions? See Question&Answers more detail:os...

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Unable to access 'git/attributes'

What does warning remote: warning: unable to access '/root/.config/git/attributes': Permission denied ... infrastructure problem to hoster? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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geometry - How to calculate the area of a polygon on the earth's surface using python?

The title basically says it all. I need to calculate the area inside a polygon on the Earth's surface using Python. ... do I do this in Python? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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php - What is an .inc and why use it?

I often see examples in PHP that include.inc files. What is the meaning of .inc? What it is used ... disadvantages and advantages of using it? See Question&Answers more detail:os...

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math - C: How to wrap a float to the interval [-pi, pi)

I'm looking for some nice C code that will accomplish effectively: while (deltaPhase >= M_PI) deltaPhase -= ... M_TWOPI; What are my options? See Question&Answers more detail:os...

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android - FCM (Firebase Cloud Messaging) Push Notification with Asp.Net

I have already push the GCM message to google server using asp .net in following method, GCM Push Notification with Asp ... .net let me know.. See Question&Answers more detail:os...

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python - Stop matplotlib repeating labels in legend

Here is a very simplified example: xvalues = [2,3,4,6] for x in xvalues: plt.axvline(x,color='b',label=' ... else: plt.axvline(x,color='b') See Question&Answers more detail:os...

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angular - ExpressionChangedAfterItHasBeenCheckedError: Expression has changed after it was checked. Previous value: 'undefined'

I know there are a lot of same questions already posted in stack-overflow and tried different solutions to ... events in child component See Question&Answers more detail:os...

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java - Splitting List into sublists along elements

I have this list (List<String>): ["a", "b", null, "c", null, "d", "e"] And I'd like something like ... sure it is what I'm looking for. Thanks! See Question&Answers more detail:os...

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python - Paramiko's SSHClient with SFTP

How I can make SFTP transport through SSHClient on the remote server? I have a local host and two remote ... work with Paramiko's SSHClient? See Question&Answers more detail:os...

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Internet Explorer 9, 10 & 11 Event constructor doesn't work

I am creating an event, so use the DOM Event constructor: new Event('change'); This works fine in modern ... there a workaround I can use? See Question&Answers more detail:os...

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Can I automatically create a table in PostgreSQL from a csv file with headers?

I'm running PostgreSQL 9.2.6 on OS X 10.6.8. I would like to import data from a CSV file with column ... a table from a CSV file with headers? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ios - Change default icon for moving cells in UITableView

I need to change default icon for moving cells in UITableView. This one: Is it possible? See Question&Answers more detail:os...

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display huge Images in Android

I'm intending to display very large Images in Android. My first solution - to supply them as pdf - fails ... the image I want to display See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - show loading icon until the page is load?

I wanted to show a loading icon to users until the page elements are fully loaded. How can I do that ... icon and add more interactivity. See Question&Answers more detail:os...

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math - Perpendicular on a line from a given point

How can I draw a perpendicular on a line segment from a given point? My line segment is defined as (x1, y1), (x2 ... to find out this (x4,y4). See Question&Answers more detail:os...

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ms access - How to SUM two fields within an SQL query

I need to get the total of two fields which are within the same row and input that number in a field at the ... the total of a column? Thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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utf 8 - MySQL command line formatting with UTF8

I have a database table that contains Swedish/Norwegian strings. When I query some data, I get output like ... the tabular formatting intact? See Question&Answers more detail:os...

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ios - How to turn a CVPixelBuffer into a UIImage?

I'm having some problems getting a UIImage from a CVPixelBuffer. This is what I am trying: CVPixelBufferRef ... ideas would be appreciated. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Override the {...} notation so i get an OrderedDict() instead of a dict()?

Update: dicts retaining insertion order is guaranteed for Python 3.7+ I want to use a .py file like a config file. So ... , ('C key', 'value3')] See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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android - FileProvider crash - npe attempting to invoke XmlResourceParser on a null String

This is a part of my manifest: <?xml version="1.0" encoding="utf-8"?> <manifest xmlns: ... .FileProvider.getUriForFile(FileProvider.java:376) See Question&Answers more detail:os...

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language agnostic - What is a Lambda?

Could someone provide a good description of what a Lambda is? We have a tag for them and they're on the ... they are in the first place. See Question&Answers more detail:os...

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Global variables in packages in R

I'm developing a package in R. I have a bunch of functions, some of them need some global variables. How do ... the way to go about the things. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Check if one list contains element from the other

I have two lists with different objects in them. List<Object1> list1; List<Object2> list2; I want to check ... Can someone propose it? Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ruby - Get list of a class' instance methods

I have a class: class TestClass def method1 end def method2 end def method3 end end How can I get a list ... class (method1, method2, method3)? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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android data binding with a custom view

The Android data binding guide discusses binding values within an activity or fragment, but is there a way to perform ... I'm trying to do? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How references to variables are resolved in Python

This message is a a bit long with many examples, but I hope it will help me and others to better grasp ... looked up in the innermost function? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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