what is the difference between matrix and array in the meaning and functions?

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mohammad
mohammad 2014-7-29
评论： Steven Lord 2022-6-25
i want to know the difference between the matrix and array in terms of the meaning and function , if any one will answer please with an example thanks
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Arun Mathew Iype
Arun Mathew Iype 2014-7-29
编辑：Jan 2017-5-30
I agree with what dpb said above. Here is the example which will help you visualize.
Matrix
mat_A= [1 2 3; 3 4 5; 6 7 8]
Conventionally this is shown in 2 dimenstions (2D) as:
Mat_A =
1 2 3
3 4 5
6 7 8
Arrays : May be of various dimensions. The above is a 2D array or matrix. A 1D array is called a vector. arr_1D = [1 2 3 4 5 6 7 8 9] We can also have 3D, as well as, ND arrays. In case of a 3D array, imagine a Rubik’s cube with each cell having a value inside it.
Here is and example using MATLAB "rand" function >> Arr_3D = rand(2,2,2)
Arr_3D(:,:,1) =
0.8147 0.1270
0.9058 0.9134
Arr_3D(:,:,2) =
0.6324 0.2785
0.0975 0.5469
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Steven Lord
Steven Lord 2022-6-25
Ran in:
Another way to explain this is by looking at the help text for the ismatrix function.
help ismatrix
ISMATRIX True if input is a matrix. ISMATRIX(M) returns logical 1 (true) if M is an m-by-n matrix, and logical 0 (false) otherwise. See also ISSCALAR, ISVECTOR, ISROW, ISCOLUMN, ISNUMERIC, ISLOGICAL, ISCHAR, ISEMPTY, SIZE. Documentation for ismatrix doc ismatrix Other functions named ismatrix categorical/ismatrix distributed/ismatrix tall/ismatrix datetime/ismatrix duration/ismatrix
So a 1-by-1 array is a matrix. A 3-by-3 array is also a matrix. But a 2-by-3-by-4 array is not a matrix.
ismatrix(zeros(1, 1))
ans = logical
1
ismatrix(zeros(3, 3))
ans = logical
1
ismatrix(zeros(2, 3, 4))
ans = logical
0

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Robin Szeto
Robin Szeto 2017-5-30
All MATLAB variables are multidimensional arrays, no matter what type of data. A matrix is a two-dimensional array often used for linear algebra. source: https://www.mathworks.com/help/matlab/learn_matlab/matrices-and-arrays.html
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Stephen23
Stephen23 2017-5-30
编辑：Stephen23 2017-5-30
+1 This is true: all MATLAB array types are N-dimensional, with implicit infinite trailing singleton dimensions, as has been discussed many times before:
"Arrays in MATLAB are N-dimensional, with an infinite number of trailing singleton dimensions."
source: http://blogs.mathworks.com/loren/2006/08/09/essence-of-indexing/
https://www.mathworks.com/matlabcentral/answers/21992-singleton-dimention-as-last-dimension-in-matrix
https://www.mathworks.com/matlabcentral/answers/229956-how-can-i-reshape-a-20370x1-matrix-into-2037x10x1

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