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I wanted to rotate a Rectangle in matplotlib but when I apply the transformation, the rectangle doesn't show anymore: ... do I make a mistake? See Question&Answers more detail:os...

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msbuild - What happened to BeforeBuild and other targets in VS2012?

I'm trying to get some pre-build steps to work in a C++ project in Visual Studio 2012 but they do not get ... "### AfterBuild ###" /> </Target> See Question&Answers more detail:os...

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What does the "undefined reference to varName" in C mean?

I have 2 files: a.c and b.c In a.c I am sending a signal to a function located in b.c signal(SIGUSR1, ... sys/wait.h> How do I fix 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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python - Django 404 error-page not found

My project is named homefood, and when I runserver I get this error.Anybody have any clue how to fix ... would be greatly appreciated. Thanks. See Question&Answers more detail:os...

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python - Assertion failure : size.width>0 && size.height>0 in function imshow

i am using opencv2 and python on raspberry pi. and i am new with python and opencv. i tried to read a ... cv2.waitKey(0) cv2.destroyAllWindows() See Question&Answers more detail:os...

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c# - smtpclient " failure sending mail"

here is my code for(int i = 0; i < number ; i++) { MailAddress to = new ... , String deliveryNotify, SmtpFailedRecipientException& exception) See Question&Answers more detail:os...

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Android - Use of view.setX() and setY in api 8

i am working on android api8. i want to position/place a view on screen dynamically. but to use setX and ... any alternative for this? need help See Question&Answers more detail:os...

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algorithm - What is a non recursive solution for Fibonacci-like sequence in Java?

Given this pseudo code of a function f(0) = 1; f(1) = 3; f(n) = 3 * f(n - 1) - f(n - 2); / ... >= 2. Is there a non recursive way of doing this? See Question&Answers more detail:os...

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Remote debugging C++ applications with Eclipse CDT/RSE/RDT

I am fighting with Eclipse (in Windows) to make it connect to my Linux box and compile and debug C++ ... suggestions how to proceed from here? See Question&Answers more detail:os...

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javascript - Using for await...of with synchronous iterables

MDN says for await...of has two use-cases: The for await...of statement creates a loop iterating over ... succession, after about 5 seconds) See Question&Answers more detail:os...

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regex - Validate date format in php

I'm trying to validate date using PHP. I'd like following formats to be valid: d/m/yy d/m/yyyy dd/m/yy ... FALSE; } Thanks for all your answers See Question&Answers more detail:os...

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Render Svg to Pdf using jspdf

I am having trouble in rendering svg element to pdf using jspdf . Iam using plugin https://github.com/ ... generarting blank pdf. Please help See Question&Answers more detail:os...

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c# - How can I prevent BufferManager / PooledBufferManager in my WCF client app from wasting memory?

Analyzing a WCF client application (that I did not write and still do not know too much about) that talks to a ... that's not the issue here) See Question&Answers more detail:os...

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sql - Combine multiple SELECT statements

I've used Excel to generate numerous SELECT statements from a list of the schema names from a database with a ... in a more efficient way? See Question&Answers more detail:os...

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c# - Change db table name in EF4 (entity framework 4)

Does anyone know how to change the mapped db table for an entity in EF4 (entity framework 4)? Later edit: I ... table name in the xml schema. See Question&Answers more detail:os...

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operating system - Is it possible to set an environment variable from Python permanently?

Using os module I can get the values of the environment variables. For example: os.environ['HOME'] However, I ... way to do it from Python? See Question&Answers more detail:os...

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sql - MySQL: "The SELECT would examine more than MAX_JOIN_SIZE rows"

I am using PHP and MySQL. In my program there is a select query involving joins. When I run it on localhost it ... okay How can I correct this? See Question&Answers more detail:os...

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sql - Postgres function returning table not returning data in columns

I have a Postgres function which is returning a table: CREATE OR REPLACE FUNCTION testFunction() RETURNS TABLE(a ... return data as columns? See Question&Answers more detail:os...

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Java casting order

Let's say I have the following setup class A { B foo(); } class C extends B { } // later A a = ... 't see how that would change the behavior. See Question&Answers more detail:os...

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html encode - "<" in a text box in ASP.NET --> how to allow it?

I have a textfield which displays a string which contains < and >. The code throws an error because of that. How ... in my textfield? Thanks :) See Question&Answers more detail:os...

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Python: can't assign to literal

My task is to write a program that asks the user to enter 5 names which it stores in a list. Next, it ... be able to generate a random name. See Question&Answers more detail:os...

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Can a C++ compiler re-order elements in a struct

Can a C++ compiler (specifically g++) re-order the internal elements of a struct? I'm seeing some ... long int *pSomeUnsignedLongLongInt; }; See Question&Answers more detail:os...

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r - facet_wrap add geom_hline

I have the following code for my ggplot - the facet_wrap function draws out 20 plots on the page for each Name and ... (~ Name, ncol = 5) See Question&Answers more detail:os...

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php - PHPMailer to use Gmail as SMTP server.Could not connect to SMTP host. Mailer Error: SMTP Error: Could not connect to SMTP host

i am trying to use phpMailer to send confirmation messages to users via email. my code is this: <?php ... true email address in that part See Question&Answers more detail:os...

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iequalitycomparer - Checking for equality in Objective-C

How do i check the key in dictionary is same as the string in method parameter? i.e in below code , dictobj is ... { //do some operation } } } See Question&Answers more detail:os...

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

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html - Show/hide forms using buttons and JavaScript

I need to show a form using a button, and hide it when the user presses another button, because the other button ... figure out how to do this. See Question&Answers more detail:os...

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c# - Getting all the combinations in an array

Say I have the following array: var arr = new[] { "A", "B", "C" }; How can I produce all the ... I'd really appreciate if someone could help. See Question&Answers more detail:os...

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javascript - Show original order of object properties in console.log

I need for some debugging to see the original order of one JavaScript object's properties but (at least in chrome devtools) ... : 4 n: 5 k: 6 See Question&Answers more detail:os...

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

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