ALIAS: Dynamically Redefine Arrays and Strings

Facilitate array and string operations: rename (
share_storage
) all or part of a numerical or string workspace at run-time

- ALIAS(Base=..., option1=..., option2=..., ...)
The order of options determines the sequence of shared positions.
Options may occur repeatedly
Related functions are: DIMENSION, REAL, CHARACTER, EDIT
The examples in the table below require the definitions of a numeric workspace (numWS) or a string workspace ( txtWS), e.g.:
- REAL numWS(1000)
- CHARACTER txtWS*1000

options	type	mini example	remarks (Base must be the first option)
Base	num	B = numWS	numWS will share memory with Vector=... and Matrix options
	txt	base = txtWS	txtWS will share memory with following String=... options
Index	num	idx = start_position	initial offset in Base, default = 1
Number	num	Base=NEW, Nr=X, N=y, n=zzz	Defines a numeric vector NEW from the named elements X, y, zzz. These elements may not have been defined or referenced before.
Rows	num	r = nRows	Number of numeric matrix rows, default = 1
Columns	num	c = nCols	Number of vector elements or columns of a numeric matrix, default = 1
Vector	num	V = SUBCEC	SUBVEC shares memory with Base with the prior defined number of cols.
Matrix	num	M = SUBMTX	SUBMTX shares memory with Base, rows and cols as defined before.
Length	num	Len = nBytes	Character count for following String=... option(s), default = 1.
String	txt	Str = SUBSTRING	SUBSTRING shares memory with Base=txt. Its length must have been defined before by the Length option.
TrailingSpace		TS = rest	rest is a symbolic name for the unused part of Base, can be used as subBase.
ERror	lbl	err=999	branch to label 999 in case of error.

SUBVECs, SUBMTXs, and SUBSTRINGs should not be referenced prior to this ALIAS statement in another context.
Alias is executed dynamically: The same Base can be called repeatedly with varying options, provided the type numeric or string is conserved.