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If B is a matrix,what is the difference between B(1:end) and B(:)

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If B=[1 2 ; 3 4]
B(1:end) returns [1 3 2 4] as a row vector and B(:) returns it as a column vector.
What is the difference?

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Accepted Answer

Stephen Cobeldick
Stephen Cobeldick on 6 Jan 2020
Edited: Stephen Cobeldick on 6 Jan 2020
Given a matrix B:
  • B(1:end) uses linear indexing. The size of the output is the same as the size of the index (which in your example is a 1xN vector).
  • B(:) is a special syntax that always returns a column vector.
Loren Shure's blog explained the first syntax as "C = A(B) produces output the size of B unless both A and B are vectors... When both A and B are vectors, the number of elements in C is the number of elements in B and with orientation of A."
See also:

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