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information retrieval - Why is log used when calculating term frequency weight and IDF, inverse document frequency?

The formula for IDF is log( N / df t ) instead of just N / df t. Where N = total documents in ... why-is-log-used-when-calculating-term-frequency-weight-and-idf-inverse-document...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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156 views

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c# - How to install EntityFramework 5.0 (and other older versions) from NuGet?

I installed EF 5.0 into the .DAL, now I want to install EF 5.0 into .BLL from Nuget But the default ... /how-to-install-entityframework-5-0-and-other-older-versions-from-nuget...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

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rails 3.2 migration cannot add index to create_table in change method

here is my migration in rails 3.2.2: class CreateStatistics < ActiveRecord::Migration def change create_table : ... migration-cannot-add-index-to-create-table-in-change-method...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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96 views

1 answer

php - Symfony2 conceptual issue: general bundles vs. specific ones

Edit: the Symfony best practices answer most of my questions. I have several questions concerning my Symfony2 ... 8012191/symfony2-conceptual-issue-general-bundles-vs-specific-ones...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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generate dependencies for a makefile for a project in C/C++

I have a project that has a makefile with broken dependencies. Is there any best known way to generate a list of ... /generate-dependencies-for-a-makefile-for-a-project-in-c-c...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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107 views

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android - How to secure my app against piracy

I am developing an android app and I am planning to publish it (paid app). I have heard that it is ... //stackoverflow.com/questions/9865162/how-to-secure-my-app-against-piracy...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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99 views

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When to build a separate reporting database?

We're building an application that has a database (yeah, pretty exciting huh :). The database is mainly ... .com/questions/3331637/when-to-build-a-separate-reporting-database...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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119 views

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TypeScript tsconfig settings for Node.js 10?

Does anyone know which target/libs are required for Node.js v10.x to use the built in async/await without ... .com/questions/51716406/typescript-tsconfig-settings-for-node-js-10...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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365 views

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optimization - Are modern C++ compilers able to avoid calling a const function twice under some conditions?

For instance, if I have this code: class SomeDataProcessor { public: bool calc(const SomeData & d1, const SomeData ... -able-to-avoid-calling-a-const-function-twice-under-some...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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75 views

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How to append in a json file in Python?

I have the a json file whose contents is {"67790": {"1": {"kwh": 319.4}}}. Now I create a ... /stackoverflow.com/questions/18980039/how-to-append-in-a-json-file-in-python...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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150 views

1 answer

python - trapping a MySql warning

In my python script I would like to trap a "Data truncated for column 'xxx'" warning durnig my query ... from:https://stackoverflow.com/questions/2102251/trapping-a-mysql-warning...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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137 views

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Is there a way to set a default app for Heroku Toolbelt?

I have more than one app/git remote at heroku and I would like to know if it is possible to configure a default ... /is-there-a-way-to-set-a-default-app-for-heroku-toolbelt...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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240 views

1 answer

iphone - How to create UINavigationBar drop shadow

Would like to know create drop shadow for UINavigationbar. I tried to create custom navigation bar background ... .com/questions/5940076/how-to-create-uinavigationbar-drop-shadow...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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712 views

1 answer

header - Authentication issues with WWW-Authenticate: Negotiate

I am trying to access a site that is password protected. It is not using basic authentication (even ... .com/questions/4265975/authentication-issues-with-www-authenticate-negotiate...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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325 views

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list - How to convert BASE64 string into Image with Flutter?

I'm converting images saved in my Firebase database to Base64 and would like to decode and encode. I've ... questions/46145472/how-to-convert-base64-string-into-image-with-flutter...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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280 views

1 answer

Visual Studio 2013 database project drop column

Does anyone know the best way to drop an existing column from the database when there are rows of data ... .com/questions/25653142/visual-studio-2013-database-project-drop-column...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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133 views

1 answer

sql - Finding similar strings with PostgreSQL quickly

I need to create a ranking of similar strings in a table. I have the following table create ... .com/questions/11249635/finding-similar-strings-with-postgresql-quickly...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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174 views

1 answer

Check if a process is running using Python on Linux

(This question already has answers here): question from:https://stackoverflow.com/questions/7647167/check-if-a-process-is-running-using-python-on-linux...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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257 views

1 answer

node.js - npm package.json OS specific script

I would like to create a package.json build script that executes slightly different set of commands when run ... .com/questions/45082648/npm-package-json-os-specific-script...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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267 views

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sql - Update only Time in a mysql DateTime field

How can I update only the time in an already existing DateTime field in MySQL? I want the date to stay the ... .com/questions/1326548/update-only-time-in-a-mysql-datetime-field...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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187 views

1 answer

How to upgrade NuGet in Visual Studio 2013

Ran into the following error during the Google Cloud Platform Bookshelf tutorial: Error 1 NuGet Package restore failed ... /42045536/how-to-upgrade-nuget-in-visual-studio-2013...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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292 views

1 answer

c# - Create PDF in memory instead of physical file

How do one create PDF in memorystream instead of physical file using itextsharp. The code below is creating ... questions/2815761/create-pdf-in-memory-instead-of-physical-file...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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481 views

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sdl - How to suppress console output in Python?

I'm using Pygame/SDL's joystick module to get input from a gamepad. Every time I call its get_hat() ... stackoverflow.com/questions/2125702/how-to-suppress-console-output-in-python...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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173 views

1 answer

Scala - modifying nested elements in xml

I'm learning scala, and I'm looking to update a nested node in some xml. I've got something working ... ://stackoverflow.com/questions/970675/scala-modifying-nested-elements-in-xml...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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129 views

1 answer

c# - How to list all Variables of Class

Is there a way to list all Variables (Fields) of a class in C#. If yes than could someone give me some ... //stackoverflow.com/questions/6536163/how-to-list-all-variables-of-class...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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529 views

1 answer

terminology - What is the difference between data types and literals in Java?

What is the difference between data types and literals in Java? question from:https://stackoverflow.com/questions/ ... is-the-difference-between-data-types-and-literals-in-java...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

118 views

1 answer

Validate (X)HTML in Python

What's the best way to go about validating that a document follows some version of HTML (prefereably that I ... :https://stackoverflow.com/questions/35538/validate-xhtml-in-python...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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236 views

1 answer

Firebug like plugin for Safari browser

Is there a development tool plugin for Safari much like how there exists the Firebug plugin for Firefox? ... .com/questions/3648866/firebug-like-plugin-for-safari-browser...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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