Programming

Vectors

Matrices with one dimension equal to one and the other greater than one are called vectors. Here is an example of a numeric vector:

• A = [5.73 2-4i 9/7 25e3 .046 sqrt(32) 8j];
  
  size(A)         % Check value of row and column dimensions
  ans =
       1     7
  

You can construct a vector out of other vectors, as long as the critical dimensions agree. All components of a row vector must be scalars or other row vectors. Similarly, all components of a column vector must be scalars or other column vectors:

• A = [29 43 77 9 21];
  B = [0 46 11];
  
  C = [A 5 ones(1,3) B]
  C =
     29   43   77    9   21    5    1    1    1    0   46   11
  

Concatenating an empty matrix to a vector has no effect on the resulting vector. The empty matrix is ignored in this case:

• A = [5.36; 7.01; []; 9.44]
  A =
      5.3600
      7.0100
      9.4400
  

Use the isvector function to tell if a variable holds a vector:

• isvector(A)
  ans =
      1
  

Scalars

Full and Sparse Matrices

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