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sympy - What causes this error (AttributeError: 'Mul' object has no attribute 'cos') in Python?

I am getting the following error code when trying to evaluate a definite integral in Python. AttributeError Traceback (most ... -n*pi,n*pi)) See Question&Answers more detail:os...

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arrays - Javascript remove all occurrence of duplicate element, leaving the only one that is unique

I want to remove elements that occurr more than once and get the unique element. The array always has 3 ... } alert(unique_element); Thanks! See Question&Answers more detail:os...

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mysql - Using reserved words in column names

this is some simple code but I just don't know why I can't use this word as the entity of the table CREATE TABLE ... 's a way to get it work. See Question&Answers more detail:os...

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c++ - Possible causes for Boost not being found by CMake in certain situations?

I build a C++ project depending on the Boost library using CMake (3.4.1). Host platform is Linux, targets are ... to find out what's going on. See Question&Answers more detail:os...

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Javascript, how to read local file?

I try to read a local file from server. I have been "googling" this topic for a while now, and some ... an example code using these functions? See Question&Answers more detail:os...

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prolog - Collect all "minimum" solutions from a predicate

Given the following facts in a database: foo(a, 3). foo(b, 2). foo(c, 4). foo(d, 3). foo(e, 2). foo(f, 6). foo ... As). Min = 2, As = [b, e, h]. See Question&Answers more detail:os...

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How to properly escape a backslash to match a literal backslash in single-quoted and double-quoted PHP regex patterns

To match a literal backslash, many people and the PHP manual say: Always triple escape it, like this \\ ... possibly nothing wrong with it. See Question&Answers more detail:os...

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email - PHP mail stopped working

Some days ago when using mail() I had it working. But now it doesn't work. And I don't know what the ... result. How can I debug this problem? See Question&Answers more detail:os...

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oracle - SQL Fiddle Output Error

Actually I am quite new to PL/SQL I created the following table using oracle pl/sql in SQL Fiddle create ... not able to display dbms_output? See Question&Answers more detail:os...

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html - Safari anchors on links not working

My html anchor is as follows. <a name="template-8"/> <h4 class="template" id="template-8">A title</h4> As ... 5.0, could this be a safari bug? See Question&Answers more detail:os...

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c++ - Is a logical right shift by a power of 2 faster in AVR?

I would like to know if performing a logical right shift is faster when shifting by a power of 2 For example ... you that this does matter. See Question&Answers more detail:os...

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C#: Use of unassigned local variable, using a foreach and if

I have this following code: I get the error, "Use of un-Assigned Local variable" I'm sure this is dead simple, but ... ""; } } return result; } See Question&Answers more detail:os...

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matlab - How to correct "Function definitions are not permitted at the prompt or in scripts"

I want to write the code for this equation:T2(i)=T1(i)+2*[T1(i-1)+T1(i+1)] syms T1 T2 function [ ... in scripts" How can I solve this problem? See Question&Answers more detail:os...

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.NET Console TextWriter that Understands Indent/Unindent/IndentLevel

Does anybody have or know of a TextWriter for the Console that understand how to indent/unindent and has the ability to set the indent level. See Question&Answers more detail:os...

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

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runtime error - IOS 8 Simulator unable to boot

When I try to run my app with Xcode 6 Beta 4 on the Simulator iOS 8.0 I always get this error: ... this is happening and found the solution? See Question&Answers more detail:os...

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javascript - Produce a promise which depends on recursive promises

I have an array of integer ids, such as var a=[1,2,3,4,5] and I have a need to perform asynchronous ... How can I accomplish that in angularjs? See Question&Answers more detail:os...

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html - Alignment of content vertically in adjacent flexbox containers

I have multiple items say cards. These cards need to stack horizontally and height needs to be the same. This is ... div> </div> </div> See Question&Answers more detail:os...

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scala - How to pattern match into an uppercase variable?

I have a method in Scala that returns a tuple, let's say the method is called 'test'. Then I ... directly into uppercase variables in Scala? See Question&Answers more detail:os...

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javascript - Is there really no way to expose the prototype of a html element in IE (<8)?

I cooked up a pattern to create and extend html elements using their prototype. This works like a charm in ... HTML elements prototype in IE? See Question&Answers more detail:os...

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How do I configure a .net core API to work in IIS?

I've got a .net core API created in Visual Studio 2017 that's working fine. When I go to deploy it I get ... IIS server pc gives error 500.19 See Question&Answers more detail:os...

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How to add firebase-admin to my android project?

Why when I try to add firebase-admin into my android project, the gradle tells me that "Version 5.5.0 is ... : 'com.google.gms.google-services' See Question&Answers more detail:os...

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The 'google-api-python-client' distribution was not found and is required by the application with pyinstaller

I am currently trying to build an app with pyinstaller. I have gotten the error The 'google-api-python- ... help would be greatly appreciated! See Question&Answers more detail:os...

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winforms - Adding an event handler for a control in child form from parent form in C#

I have two forms. One is a parent form with a button and a text box. On click of the button, a dialog ... form. What am I doing wrong here? See Question&Answers more detail:os...

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javascript - Repeat animation every 3 seconds

I am using WOW.js and animate.css, right now I am running my CSS to Infinite. I would like know how can I ... solution can be in JS or CSS3. See Question&Answers more detail:os...

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Bug in Python Regex? (re.sub with re.MULTILINE)

I'm noticing some odd behavior in Python's Regex library, and I'm not sure if I'm doing something wrong. ... : http://bugs.python.org/msg168909 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 - Definition of name property in assignment expression

Since ECMAScript 6, most function objects have a name property defined. Now, if an anonymous function expression is ... apply to this syntax. See Question&Answers more detail:os...

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c# - More organized way to call Coroutines?

In my code, I have multiple web requests needed to be called after the previous one is finished. For example: ... so I can have similar effect? See Question&Answers more detail:os...

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Convert SQL to LINQ to SQL

I'm having great trouble in converting the following SQL to LINQ to SQL, any one able to help out? SELECT ... automatic SQl to LINQ converter? See Question&Answers more detail:os...

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

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