Exp(

Function: Converts a string to an expression, and executes the expression.

Syntax: Exp("<string>"[)]

ExpStr(

Function: Converts a graph expression to a string and assigns it to the specified variable.

Syntax: ExpStr(<formula>, <string variable name>[)]

Description: A graph expression (Yn, r, Xt, Yt, X), recursion formula (an, an+1, an+2, bn, bn+1, bn+2, cn, cn+1, cn+2), or function memory (fn) can be used as the first argument (<formula>).

StrCmp(

Function: Compares “<string 1>” and “<string 2>” (character code comparison).

Syntax: StrCmp("<string 1>", "<string 2>"[)]

Description: Compares two strings and returns one of the following values. Returns 0 when “<string 1>” = “<string 2>”.

Returns 1 when “<string 1>” > “<string 2>”.

Returns –1 when “<string 1>” < “<string 2>”.

Strlnv(

Function: Inverts the sequence of a string.

Syntax: StrInv("<string>"[)]

StrJoin(

Function: Joins “<string 1>” and “<string 2>”.

Syntax: StrJoin("<string 1>", "<string 2>"[)]

Note: The same result also can be achieved using the “+” command (page 8-20).

StrLeft(

Function: Copies a string up to the nth character from the left.

Syntax: StrLeft("<string>", n[)]

(0 n 9999, n is a natural number)

StrLen(

Function: Returns the length of a string (the number of its characters).

Syntax: StrLen("<string>"[)]

StrLwr(

Function: Converts all the characters of a string to lower case.

Syntax: StrLwr("<string>"[)]

8-19