Initializing Matrices or arrays
Introduction#
Matlab has three important functions to create matrices and set their elements to zeroes, ones, or the identity matrix. (The identity matrix has ones on the main diagonal and zeroes elsewhere.)
Syntax#
- Z = zeros(sz,datatype,arraytype)
- X = ones(sz,datatype)
- I = eye(sz,datatype)
Parameters#
| Parameter | Details |
|---|---|
| sz | n (for an n x n matrix) |
| sz | n, m (for an n x m matrix) |
| sz | m,n,…,k (for an m-by-n-by-…-by-k matrix) |
| datatype | ‘double’ (default), ‘single’, ‘int8’, ‘uint8’, ‘int16’, ‘uint16’, ‘int32’, ‘uint32’, ‘int64’, or ‘uint64’ |
| arraytype | ‘distributed’ |
| arraytype | ‘codistributed’ |
| arraytype | ‘gpuArray’ |
| ## Remarks# | |
| These functions will create a matrix of doubles, by default. | |
| ## Creating a matrix of 0s |
z1 = zeros(5); % Create a 5-by-5 matrix of zeroes
z2 = zeros(2,3); % Create a 2-by-3 matrixCreating a matrix of 1s
o1 = ones(5); % Create a 5-by-5 matrix of ones
o2 = ones(1,3); % Create a 1-by-3 matrix / vector of size 3Creating an identity matrix
i1 = eye(3); % Create a 3-by-3 identity matrix
i2 = eye(5,6); % Create a 5-by-6 identity matrix