CHECK EQUAL LENGTH

CHECK EQUAL LENGTH (LET)

Let Subcommand

Given a list of names, check to see if each name is a currently defined variable and that all of the variables have the same number of elements.

Sometimes when writing general purpose macros it may be useful to know if certain names have been defined as variables, and if so, do the variables have the same number of elements.

LET <iflag> = CHECK EQUAL LENGTH <name1> <name2> ... <namek>
where <name1> <name2> ... <namek> is a list of 1 to k names;
and     <iflag> is a parameter where the status is saved.

If all names are already defined as variables with the same number of elements, <iflag> will be set to 1. Otherwise <iflag> will be set to 0.

LET IFLAG = CHECK EQUAL LENGTH Y X

The CALL EXIT and CALL EXIT ALL commands were added to allow you to exit a macro. The status flag from the CHECK EQUAL LENGTH command can be used to determine whether you want to exit from a macro or continue.

None

None

CHECK TYPES	= Check the types for a list of names.
CHECK NAMES	= Check whether a list of names have been previously defined.

Data Management

2015/06

 
skip 25
read berger1.dat y x bat
let iflag = check equal length y x bat
    

The following output is generated

 
THE STATUS FLAG FOR CHECK EQUAL LENGTH =        1