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performance - MATLAB parfor is slower than for -- what is wrong?

the code I'm dealing with has loops like the following: bistar = zeros(numdims,numcases); parfor hh=1:nt ... core so I would expect to see some improvements. Question&Answers:os...

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

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csv - How to load jar dependenices in IPython Notebook

This page was inspiring me to try out spark-csv for reading .csv file in PySpark I found a couple of posts such ... 0.3 but it is not supported. Please advise. Question&Answers:os...

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

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sql - PostgreSQL: using a calculated column in the same query

I am having trouble using a calculated column in postgres. A similar code which works in SQL is given below, ... the column total_1 and total_2 do not exist. Question&Answers:os...

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

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xmlhttprequest for local files

I have the path to a file i want to send to a rest webservice the server. I am using the xmlhttprequest object. ... the action is used it will be great!! Kavita Question&Answers:os...

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

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XSLT 3-level grouping on attributes

OK, I KNOW that variations on this have been asked and answered; I've been reading them all day, but I' ... > </xsl:stylesheet> Any help is greatly appreciated! Question&Answers:os...

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

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What's the best way to calculate date difference in Javascript

I doing a function in Javascript like the VisualBasic DateDiff. You give two dates and the returning time ... to calculate the difference of Javascript Dates? Question&Answers:os...

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

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mysql - PHP MySQLI Prevent SQL Injection

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

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converting Epoch timestamp to sql server(human readable format)

I have a problem in converting the Unix timestamp to sql server timestamp. I have a data in excel sheet and I will ... timestamp--- 2010-12-03 15:09:20.000 Question&Answers:os...

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

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How to write an RSS feed with Java?

I'm using Java, and need to generate a simple, standards-compliant RSS feed. How can I go about this? Question&Answers:os...

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

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r - Replace NA in column with value in adjacent column

This question is related to a post with a similar title (replace NA in an R vector with adjacent values). I would ... INACTIVE 1999-03-15 2009-02-07 4712-12-31 Question&Answers:os...

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

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php - Is possible to keep session even after the browser is closed?

Could anyone tell how to maintain a session (in PHP) so that the session contains are preserved and are ... accessed the next time the browser is used. Question&Answers:os...

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

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sql - How to use ANY instead of IN in a WHERE clause with Rails?

I used to have a query like: MyModel.where(id: ids) Which generates sql query like: SELECT " ... arjdbc/jdbc/RubyJdbcConnection.java:838:in `execute_query' Question&Answers:os...

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

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c++ - Is is_constexpr possible in C++11?

Is it possible to produce a compile-time boolean value based on whether or not a C++11 expression is a constant ... but I don't see a straight answer anywhere. Question&Answers:os...

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

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ios - How do you pass data between view controllers in Swift?

I tried creating global variables and updating the information when the view is loaded but data isn't being rendered. ... .text = step txtType.text = type } Question&Answers:os...

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

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version control - Vendor Branches in Git

A Git project has within it a second project whose content is being worked on independently. Submodules cannot be ... I receive the happier I will be. Question&Answers:os...

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

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sql - What are valid table names in SQLite?

What are the combination of characters for a table name in SQLite to be valid? Are all combinations of alphanumerics (A ... 123abc-ABC.txt(...); Thank you. Question&Answers:os...

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

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multithreading - Killing thread after some specified time limit in Java

Is there a way to kill a child thread after some specified time limit in Java? Edit: Also this particular ... not sure that interrupt() will be successful? Question&Answers:os...

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

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java - If you overwrite a field in a subclass of a class, the subclass has two fields with the same name(and different type)?

I have 3 classes: public class Alpha { public Number number; } public class Beta extends Alpha { public String number ... assertEquals(42, ((Gama) a).number); } Question&Answers:os...

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

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c# - Best way to remove duplicate entries from a data table

What is the best way to remove duplicate entries from a Data Table? Question&Answers:os...

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

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c# - How can I call the 'base implementation' of an overridden virtual method?

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

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How to put labels over geom_bar in R with ggplot2

I'd like to have some labels stacked on top of a geom_bar graph. Here's an example: df <- data.frame(x=factor( ... : skitch.com) Is this possible? If so, how? Question&Answers:os...

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

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java - What's the purpose of try-with-resources statements?

Java 7 has a new feature called try-with-resources. What is it? Why and where we should use it and where ... try statement has no catch block which confuses me. Question&Answers:os...

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

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396 views

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python - Getting an instance name inside class __init__()

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

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javascript - jQuery: load txt file and insert into div

I want to load a *.txt file and insert the content into a div. Here my code: js: $(document).ready(function() { ... -Error im done I don′t know what to do :-( Question&Answers:os...

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

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401 views

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Can I restore deleted files (undo a `git clean -fdx`)?

I was following the instructions on making github pages, and forgot to move down into my git sub directory. As a ... any way I can undo this terrible mistake? Question&Answers:os...

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

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321 views

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c++ - What does the single ampersand after the parameter list of a member function declaration mean?

From the answer here. class wrap { public: operator obj() const & { ... } //Copy from me. operator ... mean? How is it different than without the ampersand? Question&Answers:os...

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

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242 views

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Difference of Two Arrays Using Perl

I have two arrays. I need to check and see if the elements of one appear in the other one. Is there a ... in each and need to run the program frequently. Question&Answers:os...

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

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796 views

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lapply vs for loop - Performance R

It is often said that one should prefer lapply over for loops. There are some exception as for example ... the time is spent in subsetting Function profiling Question&Answers:os...

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

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