MATLAB Answers

Bob
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atwo to a one dimentional vector in Matlab

Asked by Bob
on 23 May 2012
How would I get a one dimentional vector in Matlab, so that when I type size(x) the size is, for example, 10 and not 1 by 10?

  1 Comment

Maybe use the numel function instead.

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3 Answers

Answer by Sean de Wolski
on 23 May 2012

That is not possible unless you define your own class that will internally store the vector as a 1x10 but display 10 when queried for size or if you write your own size function.
Otherwise, every vector, scalar, matrix etc has at least two dimensions in size.

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Answer by Walter Roberson
on 23 May 2012

You cannot. All arrays in MATLAB show up as 2 or more dimensions for the purposes of size. You can, however, get a column vector.
x = 1 : 10;
size(x)
x1 = x(:);
size(x1)
If you have a row vector, you can use the .' operator to turn it into a column vector:
x = 1 : 10;
size(x)
x1 = x.';
size(x1)
You can construct a column vector directly:
x = (1 : 10).'
size(x)
x = [1; 2; 3; 4; 5];
size(x)

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Answer by Jan
on 24 May 2012

Although Sean and Walter have stated it already, I repeat it again: "Mat"lab has been designed as "Matrix" calculator, therefore all arrays have been matrices at first. After Matlab 4.1 multidimensional arrays have been added, but the matrix like shape of vectors has not been removed due to backward compatibility.

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