Create a binary indicator matrix in R

Posted by Brian Vanover on Stack Overflow See other posts from Stack Overflow or by Brian Vanover
Published on 2013-07-02T17:00:33Z Indexed on 2013/07/02 17:05 UTC
Read the original article Hit count: 313

Filed under:

r

|

matrix

|

recommendation

|

collaborative-filtering

|

dummy-data

I have a list of data indicating attendance to conferences like this:

Event Participant
ConferenceA John
ConferenceA Joe
ConferenceA Mary
ConferenceB John
ConferenceB Ted
ConferenceC Jessica

I would like to create a binary indicator attendance matrix of the following format:

Event John Joe Mary Ted Jessica
ConferenceA 1 1 1 0 0
ConferenceB 1 0 0 1 0
ConferenceC 0 0 0 0 1

Is there a way to do this in R? Sorry for the poor formatting.

Related posts about matrix

Find the "largest" dense sub matrix in a large sparse matrix

as seen on Stack Overflow - Search for 'Stack Overflow'
Given a large sparse matrix (say 10k+ by 1M+) I need to find a subset, not necessarily continuous, of the rows and columns that form a dense matrix (all non-zero elements). I want this sub matrix to be as large as possible (not the largest sum, but the largest number of elements) within some aspect… >>> More
How does a template class inherit another template class?

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a "SquareMatrix" template class which inherits "Matrix" template class, like below: SquareMatrix.h: #ifndef SQUAREMATRIX_H #define SQUAREMATRIX_H #include "Matrix.h" template <class T> class SquareMatrix : public Matrix<T> { public: T GetDeterminant(); }; template… >>> More
iPhone OpenGL ES: How do I use gravity vector to correctly transform scene for augmented reality

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm trying figure out how to get an OpenGL specified object to be displayed correctly according to the device orientation (ie. according to the gravity vector from the accelerometer, and heading from compass). The GLGravity sample project has an example which is almost like this (despite ignoring… >>> More
How do I use the gravity vector to correctly transform scene for augmented reality?

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm trying figure out how to get an OpenGL specified object to be displayed correctly according to the device orientation (ie. according to the gravity vector from the accelerometer, and heading from compass). The GLGravity sample project has an example which is almost like this (despite ignoring… >>> More
C++ templates - matrix class

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi I'm learning templates in C++ so I decied to write matrix class which would be a template class. In Matrix.h file I wrote #pragma once #include "stdafx.h" #include <vector> using namespace std; template<class T> class Matrix { public: Matrix(); ~Matrix(); GetDataVector(); … >>> More

Developer IT

Create a binary indicator matrix in R - Developer IT

Create a binary indicator matrix in R

r

matrix

recommendation

collaborative-filtering

dummy-data

Related posts about r

Related posts about matrix

Find the "largest" dense sub matrix in a large sparse matrix

How does a template class inherit another template class?

iPhone OpenGL ES: How do I use gravity vector to correctly transform scene for augmented reality

How do I use the gravity vector to correctly transform scene for augmented reality?

C++ templates - matrix class

Categories cloud