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Symbolic functions

= (equals)

ISOLATE

LINEAR?

QUAD

The symbolic functions are used for symbolic manipulations

of expressions. The variables can be formal or numeric, but

the result is usually in symbolic form (not a number). You will

find the symbols for the symbolic functions = and I {where) in

the CHARS menu (| shift |c/-MRS) as well as the MATH menu.

Sets an equality for an equation. This is not a logical operator

and does not store values. (See “Test functions” on page 10-

20.)

expression I = expression!

Isolates the first occurrence of variable in expression=Q and

returns a new expression, where variable=newexpression.

The result is a general solution that represents multiple

solutions by including the (formal) variables si to represent

any sign and nl to represent any integer.

ISOLATE {expression, variable)

Examples

ISOLATE (2*X+8,X) returns -4

ISOLATE (A+B*X/C,X) returns -(A*C/B)

Tests whether expression is linear for the specified variable.

Returns 0 (false) or I (true).

LINEAR? (expression, variable)

Example

LINEAR? ( {X''2-D / (X+l) ,X) returns 0

Solves quadratic expression=0 for variable and returns a new

expression, where variable=newexpression. The result is a

general solution that represents both positive and negative

solutions by including the formal variable SI to represent any

sign: + or - .

QUAD (expression, variable)

Example

QUAD { (X-I) ^-7, X) returns

(2+sI*5.29150262213)/2

Using mathematical functions

10-19

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