How can I check this matrix is the correct size?

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Heather Spain
Heather Spain 2020-4-25
回答： kevin harianto 2022-4-4
I am wondering if this code is the correct code to check if the matrix is 18x4.
I think all it does is check if it has 18 rows, but does it check if it has 4 columns?
(initial4 should be an 18x4 matrix)
sz= size(initial4);
if (sz ~= 18)
fprintf("Vector must be an 18x4 matrix.");
end

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回答（2 个）

Ameer Hamza
Ameer Hamza 2020-4-25
Use this for checking the size
if ~isequal(size(M1), [18 4])
For example
M1 = rand(18, 4);
M2 = rand(18, 3);
if ~isequal(size(M1), [18 4])
fprintf("Matrix M1 must be an 18x4 matrix.\n");
end
if ~isequal(size(M2), [18 4])
fprintf("Matrix M2 must be an 18x4 matrix.\n");
end
Result
Matrix M2 must be an 18x4 matrix.
kevin harianto
kevin harianto 2022-4-4
what if you want to check if the size of the matrix is too small?

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