Group and count the number of unique values ​​(Pandas)

I have a dataframe with 2 variables: ID and outcome. I'm trying to groupby ID first, and count the number of unique values of outcome within that ID. df ID outcome 1 yes 1 yes 1 yes 2 no 2 yes 2 no Expected output: ID yes no 1 3 0 2 1 2 My code df[['

How to divide a DF into unique groups?

This question already has an answer here: Split data.frame by value 2 answers I have the following data.frame. See an example of the first few lines and attributes. SubPop Origin grid_code AL 2008 4.730380 AL 2008 5.552315 AL 2008 5.968850 AL 2008 5.

How can I write an error message if the username is unique

Teszt_1 database: function insert_to_database($get_email,$get_username,$get_orders,$get_connect) { $sql[0] = "INSERT INTO teszt_1 (email,username,orders,createdate) VALUES ('$get_email','$get_username','$get_orders',NOW())"; mysqli_query($get_co

Pandas: PivotTable with Percentage

I have dataframe ID,url,used_at,active_seconds,domain 61a77f9e5fd52a50c10cd2d4d886ec68,mazdaspb.ru,2015-01,6,mazdaspb.ru 61a77f9e5fd52a50c10cd2d4d886ec68,mazdaspb.ru/cars/mazda-cx-5/crossover/overview,2015-01,12,mazdaspb.ru 61a77f9e5fd52a50c10cd2d4d8

Vectorize a for loop in R that uses the unique function

player_ids = c(34, 87, 27, 34, 87, 9, 29, 25, 24, 25, 34, 37) end = length(player_ids) unique_players_list = list() for(i in 1:end) { unique_players_list[[i]] = unique(player_ids_unlisted[1:i]) } This is (a shortened version of) the for loop I am try

Find uniqueness as part of data with NA lines?

I have a data frame like below. I would like to find unique rows (uniqueness). But in this data I have 'NA'. I like if all value in one row with NA value is the same with other rows (like rows: 1,2,5) I want to ignore it, but if not same (like rows :

Javascript how to count unique clicks on multiple links

For example if they are say 10 unique clicks on the page I have this code which will count a click on each one: function modify_qty(val) { var qty = document.getElementById('qty').value; var new_qty = parseInt(qty,10) + val; if (new_qty < 0) { new_qt

Assignment of a single variable from a data.frame

This is a similiar question to this but my output results are different. Take the data: example <- data.frame(var1 = c(2,3,3,2,4,5), var2 = c(2,3,5,4,2,5), var3 = c(3,3,4,3,4,5)) Now I want to create example$Identity which take a value from 1:x for e

SQL Server: Join from Multiple Tables with Unique Data

I have 3 tables like this. Table1: ID ClaimNo Data1 1 1 EC11 2 1 EC12 4 2 EC21 Table2: ID ClaimNo Data2 1 1 IWC11 3 2 IWC21 4 2 IWC22 5 2 IWC23 Table3: ID ClaimNo Data3 1 1 DC11 2 1 DC12 3 1 DC13 4 1 DC14 5 1 DC15 I would like to have something like

R - eliminate duplicate columns in a sparse matrix

I have an R sparse Matrix (very big. not feasible to convert to a full matrix), I want to identify/eliminate duplicate columns if such exist. similar to unique(x,MARGIN=2), but that operates on sparse matrices. is there anything like this around? sug

How to add a new unique string to the text file

I have a text file contains several lines with words, for example like this cards door lounge dog window I want to add a new word into that list with the condition that it does not already exist in the list. For example I want to add wind or car I us

Select count and aggregate, but only single

I have a database (MSSQL) with a table as follows: CREATE TABLE [dbo].[Ciphers]( [Time] [datetime] NULL, [Hostname] [varchar](50) NULL, [ClientIP] [varchar](50) NULL, [UserAgent] [varchar](550) NULL, [CipherName] [varchar](200) NULL, [CipherVersion]

How to count unique characters (only letters and numbers)

// I have a program where I am supposed to count unique characters, only letters and numbers and don't count repeating numbers or letters. However, I have a problem finding out a way for the program not to count spaces and symbols such as "!" &q

Laravel 4: Unique (database) not validating

I am creating a basic CMS to teach myself the fundamentals of Laravel and PHP. I have a 'pages' table and I am storing a url_title. I want this URL title to be unique for obvious reasons. However, whatever I do to validate it, fails. It just saves an

Are dates at the millisecond always unique?

I'm using the current date and time to generate a unique folder name. Are there any likely scenarios in which a clash could happen? I think not, since, down to the millisecond, no two dates can be the same (unless two uploads happen at the same milli

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I'm developing a system including NFC tags and Android phone , using unique ID of NFC tags . But don't know what is the differences between 4 types NFC tag . I've found this : "NFC-compatible tags can be of the following technologies/standards and ea

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Possible Duplicate: Unique file identifier in windows I need to retrieve a unique identifier for certain files on the computer, and have only came across the Win32 GetFileInformationByHandle function. How can I accomplish this with the. NET framework

ROR - Generate an alphanumeric string for a database ID

In our DB, every Person has an ID, which is the DB generated, auto-incremented integer. Now, we want to generate a more user-friendly alpha-numeric ID which can be publicly exposed. Something like the Passport number. We obviously don't want to expos

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Let's say I have following XML file: <authors> <author>a1</author> <author>a2</author> <lastmodified>2010</lastmodified> </authors> and an XML schema fragment: <xs:element name="authors" maxOccu

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Does the QObject::objectName property have to be unique for the whole application? For example, let's say I have button somewhere called "new", then somewhere else I'm going to create a QShortcut also called "new". Is it going to cause

PHP generates a single string

I have an ID column in a table which stores the row ID number (auto increment), For example 1, 2, 3. I want to generated a random and unique string which could contain only numbers, alphabets and dash (-) and underscore (_). The length of string shou

In MySQL, is it possible to have a UNIQUE constraint on a line?

Appears that MySQL's UNIQUE constraint is on a columns by column basis, I'm looking for a way to make sure the row are UNIQUE on a row by row basis; guessing the answer is to create a hash from by concatenating the columns per row I want to be UNIQUE

C ++ list removes duplicate strings

I have a little problem when using lists. What I have: I am reading lines from a chatbox where new lines of text come now and then. I always fetch the last 20 lines from the box, then i want to compare them to all the lines i have fetched before. If

SQL Server 2008: Produce a Unique Entry Table

I have the following problem. I have a table with a few hundred thousand records, which has the following identifiers (for simplicity) MemberID SchemeName BenefitID BenefitAmount 10 ABC 1 10000 10 ABC 1 2000 10 ABC 2 5000 10 A.B.C 3 11000 What I need

How to check if a table contains an element in Lua?

Is there a method for checking if a table contains a value ? I have my own (naive) function, but I was wondering if something "official" exists for that ? Or something more efficient... function table.contains(table, element) for _, value in pai

Provide a feature only once to each unique visitor

I have written a message board as my first ASP.NET project. It seems to work well so far. However, one of the features I have is that each message has a spam rating. It is simply the number of times that viewers have marked the message as spam divide