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sql - What are projection and selection?

What is the difference between projection and selection? Is it: Projection --> for selecting the columns ... horizontal slicing respectively? See Question&Answers more detail:os...

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

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c# - Convert an object to an XML string

I have got a class named WebserviceType I got from the tool xsd.exe from an XSD file. Now I want ... it into a MethodCheckType object. 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 - Remove empty strings from array while keeping record Without Loop?

This question was asked here: Remove empty strings from array while keeping record of indexes with non ... suggestions are highly 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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How to get the current time in milliseconds from C in Linux?

How do I get the current time on Linux in milliseconds? See Question&Answers more detail:os...

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

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css - How to make borders collapse (on a div)?

Suppose I have markup like: http://jsfiddle.net/R8eCr/1/ <div class="container"> <div class="column"> <div ... t only have borders on one side. 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 - How to make lodash work with Angular JS?

I'm trying to use lodash use it at ng-repeat directives, in this way: <div ng-controller="GridController" ng-repeat ... How can I make it work? 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 Do We Distinguish Never-Asked From Stop-Asking in Android M's Runtime Permissions?

When it comes to the M Developer Preview runtime permissions, according to Google: If you have never asked for a ... we asked before or not? 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 - List of tensor names in graph in Tensorflow

The graph object in Tensorflow has a method called "get_tensor_by_name(name)". Is there anyway to get a list of valid ... 1 but not all of them. 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 - Dynamically using the first frame as poster in HTML5 video?

I'm wondering if there's any straightforward way to achieve this effect, without needing backend code to extract a ... that is not a concern. See Question&Answers more detail:os...

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

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Learning Single Responsibility Principle with C#

I am trying to learn the Single Responsibility Principle (SRP) but it is being quite difficult as I am having a ... sample codes, advice, etc. See Question&Answers more detail:os...

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

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security - How to Secure Android Shared Preferences?

The common location where SharedPreferences are stored in Android apps is: /data/data/<package name>/shared_prefs ... in securing apps. See Question&Answers more detail:os...

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

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autologin - How to keep android applications always be logged in state?

Right now I am trying to create one Android application, assume it is going to be some "X" concept okay. So I ... phones What to do for that? See Question&Answers more detail:os...

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

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wolfram mathematica - The best way to construct a function with memory

Good day, I have some very slooooow and complicated function, say f[x,y]. And I need to construct detailed ... f may contain 10000-50000 points? See Question&Answers more detail:os...

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

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c# - How to COUNT rows within EntityFramework without loading contents?

I'm trying to determine how to count the matching rows on a table using the EntityFramework. The problem is that ... so I changed the names.] 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 - Xcode MyProjectName-Bridging-Header.h does not exist

I want to start using Swift in my Objective-C project. So i added a swift class: import Foundation ... #endif #pragma clang diagnostic pop 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 - Do lambda expressions have any use other than saving lines of code?

Do lambda expressions have any use other than saving lines of code? Are there any special features provided by ... .compareTo(o2.getName()); 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 - Socket.IO handling disconnect event

Can't handle this disconnect event, don't know why socket is not sent to the client / client doesn't respond! ... be deleted, but it's not. See Question&Answers more detail:os...

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

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Is there a programmatic way to inspect the current rpath on Linux?

I'm aware that it is possible to use readelf -d <elf> | grep RPATH to inspect a given binary from the ... have to spawn an external script). See Question&Answers more detail:os...

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

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powershell - Running cURL on 64 bit Windows

I'm new to cURL, just got it installed but it seems to only do what it feels like. I'm using the 64 ... ? Windows 7 64 bit Powershell version 4 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 - Adding content to a linear layout dynamically?

If for example I have defined a root linear layout whose orientation is vertical: main.xml: <?xml version= ... more other elements inside child? See Question&Answers more detail:os...

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

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parallel processing - OpenMP and Python

I have experience in coding OpenMP for Shared Memory machines (in both C and FORTRAN) to carry out simple ... aligns best with my question? 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 - Pandas - Compute z-score for all columns

I have a dataframe containing a single column of IDs and all other columns are numerical values for which I ... your explanation of indexing. 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 to compile C into an executable binary file and run it in Android from Android Shell?

I have a Device on which I installed Android Gingerbread 2.3.4 Here i want to run C executable file on ... is no directory structure like this. See Question&Answers more detail:os...

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

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linux - Running shell script in parallel

I have a shell script which shuffles a large text file (6 million rows and 6 columns) sorts the file based the ... slow. Thanks for your help. 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 - How to correctly use Google Plus Sign In with multiple activities?

What would be a good/recommended way of tying up the Google+ api client life cycle with the flow of a multi ... or at least a general guideline. See Question&Answers more detail:os...

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

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algorithm - How to implement depth first search for graph with a non-recursive approach

I have spent lots of time on this issue. However, I can only find solutions with non-recursive methods for a ... I add to stop this scenario? See Question&Answers more detail:os...

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

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scheduled tasks - AlarmManager Android Every Day

I'm trying to make a Schedule. It should run every day at 1pm or 2pm... At the moment I can only make ... ", Toast.LENGTH_LONG).show(); 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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java - How to check if a folder exists?

I am playing a bit with the new Java 7 IO features. Actually I am trying to retrieve all the XML files in a folder. ... " + e.getMessage()); } } See Question&Answers more detail:os...

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

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