SIZE Specification (MATRIX-END MATRIX command)

The SIZE specification is a matrix expression that, when evaluated, specifies the size of the matrix to be read.

• The expression should evaluate to a two-element row or column vector. The first element designates the number of rows in the matrix to be read; the second element gives the number of columns.
• Values of the SIZE specification are truncated to integers if necessary.
• The size expression may be a constant, such as {5;5}, or a matrix variable name, such as MSIZE, or any valid expression, such as INFO(1,:).
• If you use a scalar as the size expression, a column vector containing that number of rows is read. Thus, SIZE=1 reads a scalar, and SIZE=3 reads a 3 × 1 column vector.

You must include a SIZE specification whenever you name an entire matrix (rather than a submatrix) on the READ statement. If you specify a submatrix, the SIZE specification is optional but, if included, must agree with the size of the specified submatrix.