Documentation

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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 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 Block diagonal matrix cat Concatenate arrays horzcat Concatenate arrays horizontally vertcat Concatenate arrays vertically repelem Repeat copies of array elements repmat Repeat copies of array
 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
 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 issorted Determine if array is sorted issortedrows Determine if matrix or table rows are sorted 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
 sort Sort array elements sortrows Sort rows of matrix or table 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 Permute array dimensions ipermute Inverse permute array dimensions circshift Shift array circularly shiftdim Shift array dimensions reshape Reshape array squeeze Remove dimensions of length 1
 colon Vector creation, array subscripting, and for-loop iteration end Terminate block of code or indicate last array index ind2sub Convert linear indices to subscripts sub2ind Convert subscripts to linear indices

Topics

Creating, Concatenating, and Expanding Matrices

Create a matrix or construct one from other matrices.

Array Indexing

Access elements of an array.

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.