Setting and changing parameters, variables (LET)

During the course of work, the normal progression is to decide which procedure to run, examine the parameters that control it, perhaps modify some of them, and then actually run the procedure.

The LET command allows you to change the current value of a parameter. Its two most common forms are:

LET parm = number, number, ... , number
LET parm = "text string"

where

[parm] ...is the name of a parameter

The form used depends on the original definition of the parameter (numeric or string) and this does not change. EASI will tell you if you use the wrong form and you can try again. Remember, a string parameter must be enclosed in double quotes.

Type the following to the EASI prompt:

EASI>LET VECTOR=2,3,5,6.4
EASI>LET FUNCTION="SQUARE"

For convenience, you can omit the verb LET from any assignment statement. This short form is easier to enter and simpler to read. For example,

EASI>VECTOR=2,3,5,6.4
EASI>LET VECTOR=2,3,5,6.4

produce exactly the same result.

It is possible to allow a parameter to take the value(s) of another parameter. The form of this assignment command is:

[LET] parm1 = parm2

where

[parm1, parm2]are existing parameters of the same type.

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