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c# - Should thread-safe class have a memory barrier at the end of its constructor?

When implementing a class intended to be thread-safe, should I include a memory barrier at the end of its ... doubt as to the safety. See Question&Answers more detail:os...

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

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php - Which is faster? Constants, Variables or Variable Arrays

My current web application uses about 30 or so Contants (DEFINE()). I am reading things that variables are ... out of functions and classes. 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 - How can I display text over columns in a bar chart in matplotlib?

I have a bar chart and I want over each column to display some text,how can I do that ? See Question&Answers more detail:os...

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

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php - file_get_contents returns empty string

I am hesitated to ask this question because it looks weird. But anyway. Just in case someone had encountered ... -18.phx2.fedoraproject.org) 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 alter a .NET DateTimePicker control to allow enter null values?

What's the easiest and most robust way of altering the .NET DateTimePicker control, to allow users to enter null values? 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 sort a MYSQL table in a permanent way?

I am a having a table with column Symbol and Weight(only two Column) . I need to sort table according to ... permanently. How can i do that? See Question&Answers more detail:os...

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

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arrays - Python Numpy TypeError: ufunc 'isfinite' not supported for the input types

Here's my code: def topK(dataMat,sensitivity): meanVals = np.mean(dataMat, axis=0) meanRemoved = dataMat - ... (an example would be great!) 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 - Matplotlib - Wrong overlapping when plotting two 3D surfaces on the same axes

I am trying to plot two 3D surfaces on the same axes in matplotlib with the plot_surface command. fig = plt. ... Matplotlib 1.1.1rc on Linux. 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 - Google Map error: InvalidKeyOrUnauthorizedURLMapError

I am developing in JavaScript/HTML/CSS an app that uses Google Maps. I am getting the following alert dialog ... enabled 11 Google Maps APIs. 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 - How to export S3 method so it is available in namespace?

I am creating a package and for S3 methods I export them using ##' @method predict myclass ##' @export ... predict.myclass in the console? 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# - Why does Nullable<T> HasValue property not throw NullReferenceException on Nulls?

Consider the following code: DateTime? ndate = null; Console.WriteLine(ndate.HasValue); I would have expected a ... the property HasValue on? 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 - CXF 2.4.2: No conduit initiator was found for the namespace http://schemas.xmlsoap.org/soap/http

I have a service client generated from wsdl. I am trying to call the remote service and I recieve the ... correctly would be much appriciated. 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 - How do I perform a non-blocking fopen on a named pipe (mkfifo)?

If I have a program which creates and attempts to open a named pipe using mkfifo, how can I open a pipe for ... is running on a linux 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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python - Letter Count on a string

Python newb here. I m trying to count the number of letter "a"s in a given string. Code is below. It ... count print count_letters('banana','a') See Question&Answers more detail:os...

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

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android screen orientation

I tried getOrientation() to get the orientation value but it always returns 0! 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# - How to get type of TKey and TValue given a Dictionary<TKey,TValue> type

I want to get type of TKey and TValue given a Dictionary<TKey,TValue> type. eg. If type is Dictionary<Int32 ... ) and valueType = typeof(String) See Question&Answers more detail:os...

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

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openshift - Kubernetes ConfigMap size limitation

Though resourceQuotas may limit the number of configmaps in a namespace, is there any such option to limit the size ... , should be fine then. 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 - Get values from first and last row per group

I'm new to Postgres, coming from MySQL and hoping that one of y'all would be able to help me out. I ... wondering what I'm doing wrong here? See Question&Answers more detail:os...

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

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android - Detailed debug logs with Volley

In Restkit on iOS there is a verbose debug option. RKLogConfigureByName("*", RKLogLevelTrace);. Does anyone know ... : 2.onErrorResponse: Error: 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 remove nested parentheses in LISP

How can I remove nested parentheses recursively in Common LISP Such as (unnest '(a b c (d e) ((f) g))) => (a b c ... ((a)))) ())) => (a) 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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mysql - How to transform vertical data into horizontal data with SQL?

I have a table "Item" with a number of related items, like so: ID Rel_ID Name RelRank --- ------ ---- ... column, which does appear in my data] See Question&Answers more detail:os...

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

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git - Can I fetch a stash from a remote repo into a local branch?

A colleague has a stash in their repository which I can access (via the filesystem), and I'd like to pull ... I can fetch the remote stash? 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 - Why shouldn't Flask be deployed with the built in server?

Why is it recommended to deploy a Flask app using Apache or Nginx? It has a server built in, can't it ... the correct ports in the firewall? 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 do I draw an image to a JPanel or JFrame?

How do I draw an Image to a JPanel or JFrame, I have already read oracle's tutorial on this but I can' ... .setVisible(true); Thanks in advance! 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++ - Is it possible to connect a signal to a static slot without a receiver instance?

Is it possible to connect a signal to static slot without receiver instance? Like this: connect(&object, SIGNAL(some() ... Qt 5 it is possible. See Question&Answers more detail:os...

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

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regex - regular expressions: match x times OR y times

Lets say I need to match a pattern if it appears 3 or 6 times in a row. The closest I can get is ... ' should match '1234' should not match See Question&Answers more detail:os...

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

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Remove large padding after hamburger (menu) icon in Android Toolbar?

Here is a picture of the large padding gap after the menu icon: This occurred after not working on my ... spacing got doubled or something. See Question&Answers more detail:os...

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

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I have a high-performant function written in Julia, how can I use it from Python?

I have a found a Julia function that nicely does the job I need. How can I quickly integrate it to be able ... way to use it from Python? See Question&Answers more detail:os...

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

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