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r - How do I install a package that has been archived from CRAN?

I typed the following in the R command line: install.packages("RecordLinkage") I got the following error: ... work? Any help would be greatly appreciated. Question&Answers:os...

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

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java - How do I write a compareTo method which compares objects?

I am learning about arrays, and basically I have an array that collects a last name, first name, and score. I ... book only shows you how to use the compareTo. Question&Answers:os...

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

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linux - How to upgrade glibc from version 2.12 to 2.14 on CentOS?

I do not know how to upgrade glibc from version 2.12 to 2.14 on CentOS 6.3. I need your help. Question&Answers:os...

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

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javascript - Jquery Mobile - $.mobile.changepage not loading external .JS files

So I am having a hard time getting $.mobile.changePage to function properly. I call it like this: $. ... "DataformsM-AddRecord.html"; It will function properly. Question&Answers:os...

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

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Does java have a int.tryparse that doesn't throw an exception for bad data?

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

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python - Suppressing scientific notation in pandas?

I have a DataFrame in pandas where some of the numbers are expressed in scientific notation (or exponent notation) like ... , with no ability to turn it off. Question&Answers:os...

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

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c++ - Using SDL2 with CMake

I'm trying to use CLion to create a SDL2 project. The problem is that the SDL headers can't be found ... using Windows and CLion is configured to use cygwin64. Question&Answers:os...

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

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c++ - About binding a const reference to a sub-object of a temporary

With code like #include <stdio.h> struct P2d { double x, y; P2d(double x, double y) : x(x), y(y) {} ... this a bug in g++ or something allowed by the standard? Question&Answers:os...

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

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c# - No console output when using AllocConsole and target architecture x86

I have a WinForms project, and if the user want's a debug console, I allocate a console with AllocConsole( ... my console when running inside of Visual Studio? Question&Answers:os...

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

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r - Count non-NA values by group

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

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python - How can we JOIN two Spark SQL dataframes using a SQL-esque "LIKE" criterion?

We are using the PySpark libraries interfacing with Spark 1.3.1. We have two dataframes, documents_df := { ... like this before? With kind regards, Will Question&Answers:os...

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

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Why is there no PRODUCT aggregate function in SQL?

Im looking for something like SELECT PRODUCT(table.price) FROM table GROUP BY table.sale similar to how SUM works. ... I assumed all sql does not support it. Question&Answers:os...

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

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python - How do I bind the enter key to a function in tkinter?

I am a Python beginning self-learner, running on MacOS. I'm making a program with a text parser GUI in ... .parse) app = Application(root) root.mainloop() Question&Answers:os...

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

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c++ - Why do we need to mark functions as constexpr?

C++11 allows functions declared with the constexpr specifier to be used in constant expressions such as template ... effect at all on any valid program? Question&Answers:os...

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

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Why can't you use offsetof on non-POD structures in C++?

I was researching how to get the memory offset of a member to a class in C++ and came across this on wikipedia: ... puzzle. I don't see what the problem is. Question&Answers:os...

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

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mysql - Filter by COUNT(*)?

Is it possible to group results and then filter by how many rows are in the group? Something like this: SELECT * FROM mytable WHERE COUNT(*) > 1 GROUP BY name Question&Answers:os...

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

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133 views

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Show / hide div on click with CSS

I have a menu and three hidden divs that show up depending on what option the user selects. I would like to show / ... off. Maybe z-index could do the trick...? Question&Answers:os...

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

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Javascript - Variable in function name, possible?

i hope this question is not too simple, but i have no idea :( How can i start a function with a var in ... I hope somebody can help me. Thanks in advance! Peter Question&Answers:os...

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

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python - Convert hex to float

How to convert the following hex string to float (single precision 32-bit) in Python? "41973333" -> ... > 1.91700000762939453125E1 "470FC614" -> 3.6806078125E4 Question&Answers:os...

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

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c++ - Can we write an EOF character ourselves?

Most of the languages like C++ when writing into a file, put an EOF character even if we miss to write statements ... coz it can lead to a lot of new ideas. Question&Answers:os...

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

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317 views

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c# - Wildcard search for LINQ

I would like to know if it is possible to do a wildcard search using LINQ. I see LINQ has Contains, StartsWith, ... %Test if%it work%, how do I do it? Regards Question&Answers:os...

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

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c++ - Scope of variables in if statements

I have a class that has no default constructor or assignment operator so it is declared and initialized within an ... and create the appropriate type with new. Question&Answers:os...

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

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r - Replace negative values by zero

We want to set all values in an array zero that are negative. I tried out a a lot of stuff but did ... 0} else{pred_precipitation[i] = pred_precipitation[i]} } Question&Answers:os...

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

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java - How to make Lombok and AspectJ work together?

I just finished posting this issue on SO about Lombok not generating my getters/setters. It turns out ... exclusive? Do both technologies work together? Question&Answers:os...

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

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Checking internet connection on android

I have the following code for checking internet connection wifi/EDGE/GPRS/3G on my application. the code is public ... until unless I turn off and on device. Question&Answers:os...

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

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350 views

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javascript - Download Canvas as PNG in fabric.js giving network Error

I want to download Canvas as PNG using fabric.js. While downloading I want to scale the image. So I use multiplier ... = "helloWorld.png"; link.click(); } Question&Answers:os...

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

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163 views

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android - Which correct flag of autoConnect in connectGatt of BLE?

My goal is to make an auto connection between Bluetooth Low Energy device and phone. I followed the ... ; mConnectionState = STATE_CONNECTING; return true; } Question&Answers:os...

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

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Spiral rule and 'declaration follows usage' for parsing C and C++ declarations

This question follows this other question about C declarations. Reading the answer to this question, I read about ... be wrong in another more complicated case. Question&Answers:os...

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

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