Product Documentation

Search MATLAB Documentation
R2012a Documentation → MATLAB
View documentation for other releases	Learn more about MATLAB

Contents

Index

• Getting Started

• User's Guide

• Functions

• Desktop Tools and Development Environment

• Data Import and Export

• Mathematics

• Arrays and Matrices

• Linear Algebra

• Elementary Math

• Polynomials

• Interpolation and Computational Geometry

• Cartesian Coordinate System Conversion

• Nonlinear Numerical Methods

• Special Functions

• Sparse Matrices

• Elementary Sparse Matrices

• Full to Sparse Conversion

• Sparse Matrix Manipulation

• Reordering Algorithms

• Linear Algebra

• Linear Equations (Iterative Methods)

• Tree Operations

• Math Constants

• Data Analysis

• Programming and Data Types

• Object-Oriented Programming

• Graphics

• 3-D Visualization

• GUI Development

• External Interfaces

• Examples

• Release Notes

spones - Replace nonzero sparse matrix elements with ones

Syntax

R = spones(S)

Description

R = spones(S) generates a matrix R with the same sparsity structure as S, but with 1's in the nonzero positions.

Examples

c = sum(spones(S)) is the number of nonzeros in each column.

r = sum(spones(S'))' is the number of nonzeros in each row.

sum(c) and sum(r) are equal, and are equal to nnz(S).

Free MATLAB Interactive Kit

Explore how to use MATLAB to make advancements in engineering and science.

Download free kit

Trials Available

Try the latest version of MATLAB and other MathWorks products.

Get trial software