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Matrices and Arrays

Array creation, combining, reshaping, rearranging, and indexing

Matrices and arrays are the fundamental representation of information and data in MATLAB^®. You can create common arrays and grids, combine existing arrays, manipulate an array's shape and content, and use indexing to access array elements. For an overview of matrix and array manipulation, watch Working with Arrays.

Functions

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Create and Combine Arrays

`zeros`	Create array of all zeros
`ones`	Create array of all ones
`rand`	Uniformly distributed random numbers
`true`	Logical 1 (true)
`false`	Logical 0 (false)
`eye`	Identity matrix
`diag`	Create diagonal matrix or get diagonal elements of matrix
`blkdiag`	Construct block diagonal matrix from input arguments
`cat`	Concatenate arrays along specified dimension
`horzcat`	Concatenate arrays horizontally
`vertcat`	Concatenate arrays vertically
`repelem`	Repeat copies of array elements
`repmat`	Repeat copies of array

Create Grids

`linspace`	Generate linearly spaced vector
`logspace`	Generate logarithmically spaced vector
`freqspace`	Frequency spacing for frequency response
`meshgrid`	2-D and 3-D grids
`ndgrid`	Rectangular grid in N-D space

Determine Size and Shape

`length`	Length of largest array dimension
`size`	Array size
`ndims`	Number of array dimensions
`numel`	Number of array elements
`isscalar`	Determine whether input is scalar
`isvector`	Determine whether input is vector
`ismatrix`	Determine whether input is matrix
`isrow`	Determine whether input is row vector
`iscolumn`	Determine whether input is column vector
`isempty`	Determine whether array is empty

Reshape and Rearrange

`sort`	Sort array elements
`sortrows`	Sort rows of matrix or table
`issorted`	Determine if array is sorted
`issortedrows`	Determine if matrix or table rows are sorted
`topkrows`	Top rows in sorted order
`flip`	Flip order of elements
`fliplr`	Flip array left to right
`flipud`	Flip array up to down
`rot90`	Rotate array 90 degrees
`transpose`	Transpose vector or matrix
`ctranspose`	Complex conjugate transpose
`permute`	Rearrange dimensions of N-D array
`ipermute`	Inverse permute dimensions of N-D array
`circshift`	Shift array circularly
`shiftdim`	Shift dimensions
`reshape`	Reshape array
`squeeze`	Remove singleton dimensions

Indexing

`colon`	Vector creation, array subscripting, and for-loop iteration
`end`	Terminate block of code, or indicate last array index
`ind2sub`	Subscripts from linear index
`sub2ind`	Convert subscripts to linear indices