Tutorial by Examples: le

Select distinct rows across dataframe

Let df = pd.DataFrame({'col_1':['A','B','A','B','C'], 'col_2':[3,4,3,5,6]}) df # Output: # col_1 col_2 # 0 A 3 # 1 B 4 # 2 A 3 # 3 B 5 # 4 C 6 To get the distinct values in col_1 you can use Series.unique() df['col_1'].unique() # Output: ...

Parallel Extensions

Parallel extensions have been introduced along with the Task Parallel Library to achieve data Parallelism. Data parallelism refers to scenarios in which the same operation is performed concurrently (that is, in parallel) on elements in a source collection or array. The .NET provides new constructs t...

Complete example : Login/logout a user

Prerequisites This topic is not about Redux and/or Ngrx : You need to be comfortable with Redux At least understand the basics of RxJs and Observable pattern First, let's define an example from the very beginning and play with some code : As a developer, I want to : Have an IUser inter...

Basic examples - Classification and Regression

###### Used for both Classification and Regression examples library(randomForest) library(car) ## For the Soils data data(Soils) ###################################################### ## RF Classification Example set.seed(656) ## for ...

Windows - Installation using installer

Probably the easies way to set up ruby on windows is to go to http://rubyinstaller.org/ and from there donwload an executable that you will install. You don't have to set almost anything, but there will be one important window. It will have a check box saying Add ruby executable to your PATH. Confi...

Linux - troubleshooting gem install

First UC in the example Gems $> gem install nokogiri can have a problem installing gems because we don't have the permissions for it. This can be sorted out in more then just one way. First UC solution a: U can use sudo. This will install the gem for all the users. This method should be frowne...

Using SUMPRODUCT with boolean arrays

Consider the following ranges A1:A3 and B1:B3 as below =SUMPRODUCT(--(A1:A3="c"),B1:B3) This will first manipulate (A1:A3="c") into the following array A1="c" = FALSE A2="c" = FALSE A3="c" = TRUE Then apply the -- operator which converts...

Bundler/inline (bundler v1.10 and later)

Sometimes you need to make a script for someone but you are not sure what he has on his machine. Is there everything that your script needs? Not to worry. Bundler has a great function called in line. It provides a gemfile method and before the script is run it downloads and requires all the necessa...

Selection of cross-sections using .xs

In [1]: import pandas as pd import numpy as np arrays = [['bar', 'bar', 'baz', 'baz', 'foo', 'foo', 'qux', 'qux'], ['one', 'two', 'one', 'two', 'one', 'two', 'one', 'two']] idx_row = pd.MultiIndex.from_arrays(arrays, names=['Row_First', 'Row_Second']) idx_col = pd.MultiIndex.from_pro...

2.EJS file example(refer 1.setting up... before this)

the following is an ejs file. <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Hello, world!</title> </head> <body> <%= message %> </body> </html>

3.rendering view with express(refer 2.EJS file... before this)

app.get("/",function(req,res){ response.render("index",{ //render the index when root(/) is requested message:"rendered view with ejs" }); });

How to find what frameworks are available in the current version of Rails?

Use the config.frameworks option to get an array of Symbols that represent each framework.

Example view with `PanelGroup`s

import React from 'react'; import Pane from './components/Pane.js'; import Panel from './components/Panel.js'; import PanelGroup from './components/PanelGroup.js'; class MainView extends React.Component { constructor(props) { super(props); } render() { return...

Build-in Roles

Built-in database user roles and database administration roles roles exist in each database. Database User Roles read readwrite

Example feature file

Example Feature file: Feature: Calculator In order to avoid silly mistakes As a math idiot I want to be told the sum of two numbers @mytag Scenario: Add two numbers Given I have entered 50 into the calculator And I have also entered 70 into the calculator When I press ad...

Send Simple Email

public class GoogleMailTest { GoogleMailTest() { } public static void Send(final String username, final String password, String recipientEmail, String title, String message) throws AddressException, MessagingException { GoogleMailTest.Send(username, password, recipientE...

Enable issue tracker in Bitbucket

Go to the repository you want to create issue for, something like: https://bitbucket.org//<repo_name>/ Go to setting, left bottom corner Select Issue tracker under Issues Select the type of the issue tracker you want to enable (no issue tracking, private or public) Click save Now the ...

Delete a branch in Bitbucket

Go to the repository, e.g.:https://bitbucket.org/username/repo_name/ On the left menu, choose branches Select the branch you want to delete from the branches page Click on ... at the top right of the page, then click Delete branch A confirmation popup will appear, click Confirm

Salesforce ETL tools

Salesforce DataLoader Dataloader.io Jitterbit SFXOrgData DreamFactory Monarch Pentaho Kettle Talend

Erroneous code, can you spot why this usage of key will lead to bugs?

var pipeline = {}; // (...) adding things in pipeline for(var key in pipeline) { fs.stat(pipeline[key].path, function(err, stats) { if (err) { // clear that one delete pipeline[key]; return; } // (...) pipeline[key].count++; }); } The problem i...

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