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programming languages - Why is the maximum value of an unsigned n-bit integer 2^n-1 and not 2^n?

The maximum value of an n-bit integer is 2n-1. Why do we have the "minus 1"? Why isn't the maximum just 2n? See Question&Answers more detail:os...

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

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mapreduce - Best way to do one-to-many "JOIN" in CouchDB

I am looking for a CouchDB equivalent to "SQL joins". In my example there are CouchDB documents that are list ... how to do this shorter. See Question&Answers more detail:os...

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

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Invoking Java main method with parameters from Eclipse

During development (and for debugging) it is very useful to run a Java class' public static void main(String[] ... time (with a nice history). See Question&Answers more detail:os...

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

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out of memory - Android OutOfMemoryError:?

I am sporadically getting an OutOfMemoryError: (Heap Size=49187KB, Allocated=41957KB) in one of my apps. What can ... e.printStackTrace(); } } See Question&Answers more detail:os...

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

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How to get the name of enumeration value in Swift?

If I have an enumeration with raw Integer values: enum City: Int { case Melbourne = 1, Chelyabinsk, Bursa } let ... )") > Your city is Melbourne See Question&Answers more detail:os...

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

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google chrome - Why is document.body null in my javascript?

Here is my brief HTML document. Why is Chrome Console noting this error: "Uncaught TypeError: Cannot call method ' ... > </body> </html> 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 - figure of imshow() is too small

I'm trying to visualize a numpy array using imshow() since it's similar to imagesc() in Matlab. imshow(random. ... s not what I want. Thanks! 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 - Pandas get the most frequent values of a column

i have this dataframe: 0 name data 1 alex asd 2 helen sdd 3 alex dss 4 helen sdsd 5 john sdadd so i am ... it Helen appears two times as well. 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 elegant inverse function of int(string,base)

python allows conversions from string to integer using any base in the range [2,36] using: int(string,base) im ... of int(string,base) ? See Question&Answers more detail:os...

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

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oop - What is the best way to create a sparse array in C++?

I am working on a project that requires the manipulation of enormous matrices, specifically pyramidal summation for a ... of a better system? See Question&Answers more detail:os...

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

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c++ - MinGW linker error: winsock

I am using MinGW compiler on Windows to compile my C++ application with sockets. My command for linking looks ... the problem can be, please? See Question&Answers more detail:os...

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

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bash - Detect if PATH has a specific directory entry in it

With /bin/bash, how would I detect if a user has a specific directory in their $PATH variable? For example if ... Your path is correctly set" fi See Question&Answers more detail:os...

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

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r - Speeding up the performance of write.table

I have a data.frame and I want to write it out. The dimensions of my data.frame are 256 rows by 65536 ... are faster alternatives to write.csv? See Question&Answers more detail:os...

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

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Handle fatal errors in PHP using register_shutdown_function()

According to the comment on this answer it is possible to catch Fatal Errors through a shutdown function which ... create a proper backtrace? See Question&Answers more detail:os...

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

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powershell - Redirection of standard and error output appending to the same log file

I need to collect the standard output and error log from several processes into one single log file. So every ... put the information to append? See Question&Answers more detail:os...

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

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dns - CNAME SSL certificates

If I go to www.example.com which has an image on the page that links to assets.example.com which is a ... , but assets.example.com does? See Question&Answers more detail:os...

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

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iphone - Can i pop to Specific ViewController?

I am using navigation based application. I push First ViewController to Second ViewController and from Second ViewController ... x animated:NO]; See Question&Answers more detail:os...

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

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Elasticsearch Bulk Index JSON Data

I am trying to bulk index a JSON file into a new Elasticsearch index and am unable to do so. I have the ... with indexing this type of JSON? See Question&Answers more detail:os...

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

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java - Send HTTP request manually via socket

When I send a normal HTTP request via a socket, the server does not respond with an OK response. I copied ... request when I send it manually? 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 - How to get the global/world position of a child object?

How do I get the global position of an Object3D inside another Object3D? setup: var parent = new THREE.Object3D(); ... not (200, 200, 200). See Question&Answers more detail:os...

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

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windows - How to make a batch file delete itself?

Is it possible to make a batch file delete itself? I have tried to make it execute another file to delete it but ... My OS is Windows 7 32 bit. See Question&Answers more detail:os...

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

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.net - Localize Strings in Javascript

I'm currently using .resx files to manage my server side resources for .NET. the application that I am dealing ... . I'm open to suggestions. See Question&Answers more detail:os...

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

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java - How to get jersey logs at server?

I am using jersey for a REST WS. How do I enable jersey logs at server side? Long story: I ... .DispatchImpl.invoke(DispatchImpl.java:195) See Question&Answers more detail:os...

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

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Renaming multiple files in a directory using Python

I'm trying to rename multiple files in a directory using this Python script: import os path = '/Users/myName/ ... I solve this issue? Thanks. See Question&Answers more detail:os...

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

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sql - Mysql: Order by like?

assume that we are performing search using keywords: keyword1, keyword2, keyword3 there are records in database with ... to create such order? See Question&Answers more detail:os...

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

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wpf - Binding [VisualStateManager] view state to a MVVM viewmodel?

How do you bind the VisualStateManager state of a control to a property in you viewmodel? Can it be done? See Question&Answers more detail:os...

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

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iphone - NSDateFormatter returning nil in OS 4.0

I had the following code working on on OS 3.x NSString *stringDate = @"2010-06-21T20:06:36+00:00"; ... methods. What did i leave out? See Question&Answers more detail:os...

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

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java - Size of Huge Objects directly allocated to Old Generation

Recently I've been reading about object allocations in different generations in Java. Most of the times new objects ... Thanks for your time :) See Question&Answers more detail:os...

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

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