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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.


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zerosCreate array of all zeros
onesCreate array of all ones
randUniformly distributed random numbers
trueLogical 1 (true)
falseLogical 0 (false)
eyeIdentity matrix
diagCreate diagonal matrix or get diagonal elements of matrix
blkdiagBlock diagonal matrix
catConcatenate arrays
horzcatConcatenate arrays horizontally
vertcatConcatenate arrays vertically
repelemRepeat copies of array elements
repmatRepeat copies of array
linspaceGenerate linearly spaced vector
logspaceGenerate logarithmically spaced vector
freqspaceFrequency spacing for frequency response
meshgrid2-D and 3-D grids
ndgridRectangular grid in N-D space
lengthLength of largest array dimension
sizeArray size
ndimsNumber of array dimensions
numelNumber of array elements
isscalarDetermine whether input is scalar
issortedDetermine if array is sorted
issortedrowsDetermine if matrix or table rows are sorted
isvectorDetermine whether input is vector
ismatrixDetermine whether input is matrix
isrowDetermine whether input is row vector
iscolumnDetermine whether input is column vector
isemptyDetermine whether array is empty
sortSort array elements
sortrowsSort rows of matrix or table
flipFlip order of elements
fliplrFlip array left to right
flipudFlip array up to down
rot90Rotate array 90 degrees
transposeTranspose vector or matrix
ctransposeComplex conjugate transpose
permutePermute array dimensions
ipermuteInverse permute array dimensions
circshiftShift array circularly
shiftdimShift array dimensions
reshapeReshape array
squeezeRemove dimensions of length 1
colonVector creation, array subscripting, and for-loop iteration
endTerminate block of code or indicate last array index
ind2subConvert linear indices to subscripts
sub2indConvert subscripts to linear indices


Creating, Concatenating, and Expanding Matrices

Create a matrix or construct one from other matrices.

Array Indexing

Access elements of an array by specifying their indices or by checking whether elements meet a condition.

Removing Rows or Columns from a Matrix

Remove matrix rows or columns.

Reshaping and Rearranging Arrays

Change the shape or arrangement of elements in an existing array.

Multidimensional Arrays

Create and manipulate arrays with three or more dimensions.