Scalar variables

A scalar is a single valued double precision real numeric variable. A scalar can be used wherever a single numeric value is expected. Indices have no meaning, and so are not allowed on scalars.

A literal scalar can be a single number, such as, 3.456, or an expression that results in a single number, such as LEN(x)+2.

The following table shows the possible ways that variables can be considered to be equivalent to scalars, that is, can be used wherever scalars are expected.

Let a and b be scalars
Suppose that M is a matrix, V is a vector, and S is a scalar
S=the value of S
V[a]=the value stored in the ath element of V
M[a,b]=the value stored in row a and column b of M

  Variable names
  Vector variables