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scala - How can I change column types in Spark SQL's DataFrame?

Suppose I'm doing something like: val df = sqlContext.load("com.databricks.spark.csv", Map("path" -> "cars.csv", ... a better way to do this in Spark/Scala... Question&Answers:os...

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

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Can Selenium WebDriver open browser windows silently in the background?

I have a Selenium test suite that runs many tests and on each new test it opens a browser window on top of any ... (Mac) to open the windows in the background? Question&Answers:os...

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

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windows - XAMPP - Port 80 in use by "Unable to open process" with PID 4! 12

I have been trying to figure out how to fix this problem for two days. I'm new to this kind of thing so ... and the Control Panel to listen on a different port Question&Answers:os...

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

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java - Difference between spring @Controller and @RestController annotation

Difference between spring @Controller and @RestController annotation. Can @Controller annotation be used for both Web MVC ... is Web MVC or REST application. Question&Answers:os...

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

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listview - Android List View Drag and Drop sort

I have a list of records in a listview that I want the user to be able to re-sort using a drag and drop ... Can anyone point me to some code for doing this? Question&Answers:os...

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github for windows - Where is git.exe located?

I have PyCharm and I am looking around trying to find git.exe to set it up with my repo. What is the PATH to git.exe? Question&Answers:os...

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php - When to use static vs instantiated classes

PHP is my first programming language. I can't quite wrap my head around when to use static classes vs instantiated ... Is there a proper way to do this stuff? Question&Answers:os...

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java - Setting default values for columns in JPA

Is it possible to set a default value for columns in JPA, and if, how is it done using annotations? Question&Answers:os...

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android - What is the size of ActionBar in pixels?

I need to know the exact size of ActionBar in pixels so to apply correct background image. Question&Answers:os...

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CUDA incompatible with my gcc version

I have troubles compiling some of the examples shipped with CUDA SDK. I have installed the developers driver (version ... as a dependency at this point... Question&Answers:os...

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objective c - How to Deal with Temporary NSManagedObject instances?

I need to create NSManagedObject instances, do some stuff with them and then trash them or store to sqlite ... the whole graph also get inserted into context? Question&Answers:os...

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php - How to remove non-alphanumeric characters?

I need to remove all characters from a string which aren't in a-z A-Z 0-9 set or are not spaces. Does anyone have a function to do this? Question&Answers:os...

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git --git-dir not working as expected

I am trying to run git from a different directory than I am in. So for example if I am in: cd /home/domain ... Hope someone can advise on what I'm doing wrong. Question&Answers:os...

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Accessing MP3 metadata with Python

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java - keytool error Keystore was tampered with, or password was incorrect

I am getting following error while generating certificates on my local machine. C:Usersabc>keytool -genkey -alias ... working fine. Please share your inputs. Question&Answers:os...

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linux - ld cannot find an existing library

I am attempting to link an application with g++ on this Debian lenny system. ld is complaining it cannot ... be wrong? Am I doing something completely stupid? Question&Answers:os...

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

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iphone - Transparent Modal View on Navigation Controller

I'm trying to create a transparent modal View on top of my navigation controller. Does anyone know if this is possible? Question&Answers:os...

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javascript - How to get the element clicked (for the whole document)?

I would like to get the current element (whatever element that is) in an HTML document that I clicked. I am using: ... with $(this).attr("myclass") in jQuery. Question&Answers:os...

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Should I use Java date and time classes or go with a 3rd party library like Joda Time?

I'm creating a web based system which will be used in countries from all over the world. One type of data ... , but I've never really compared them myself. Question&Answers:os...

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ios - Using SSL in an iPhone App - Export Compliance

I'm looking at creating an iPhone app that will communicate with a REST Web service. Because some user- ... either from Apple or from the US government? Question&Answers:os...

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Merge PDF files with PHP

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

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javascript - How do I fix blurry text in my HTML5 canvas?

I am a total n00b with HTML5 and am working with the canvas to render shapes, colors, and text. In my app, I ... (canvas); <div id="layout-content"></div> Question&Answers:os...

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

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javascript - Array.push() if does not exist?

How can I push into an array if neither values exist? Here is my array: [ { name: "tom", text: "tasty" }, { name ... I want it to .push() How can I do this? Question&Answers:os...

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

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python - How to embed HTML into IPython output?

Is it possible to embed rendered HTML output into IPython output? One way is to use from IPython.core. ... and make IPython output a bit more interactive? Question&Answers:os...

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

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c# 4.0 - Is it possible to call a C function from C#.Net

I have a C lib and want to call function in this library from C# application. I tried creating a ... return ConnectSession(handle, publicKey, publicKeyLen); } Question&Answers:os...

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html - How to remove the underline for anchors(links)?

Is there anyway (in CSS) to avoid the underline for the text and links introduced in the page .. ? Question&Answers:os...

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

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r - Change the class from factor to numeric of many columns in a data frame

What is the quickest/best way to change a large number of columns to numeric from factor? I used the following ... as in: df$colname <- as.numeric(ds$colname) Question&Answers:os...

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

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how to merge 200 csv files in Python

Guys, I here have 200 separate csv files named from SH (1) to SH (200). I want to merge them into a single csv file. How can I do it? Question&Answers:os...

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

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