Variable Specification (MATRIX-END MATRIX command)

The variable reference on the READ statement is a matrix variable name, with or without indexes.

For a name without indexes:

• READ creates the specified matrix variable.
• The matrix need not exist when READ is executed.
• If the matrix already exists, it is replaced by the matrix read from the file.
• You must specify the size of the matrix using the SIZE specification.

For an indexed name:

• READ creates a submatrix from an existing matrix.
• The matrix variable named must already exist.
• You can define any submatrix with indexes; for example, M(:,I). To define an entire existing matrix, specify M(:,:).
• The SIZE specification can be omitted. If specified, its value must match the size of the specified submatrix.