TCL Command FREE

Syntax

FREE arg1 arg2

Description

The interpolation is not specified. The specified values apply, starting with the abscissa value up to the next table entry.

Arguments

Minimum quantity: 2

arg1

Value	Dimension	Meaning
x	DOUBLE	Abscissa value. A table describes a functional relation. The abscissa values are to be given in ascending order.
xexpr	TEXT	Abscissa value as mathematical expression

arg2

Value	Dimension	Meaning
y	DOUBLE	Ordinate value. A table describes a functional relation.
yexpr	TEXT	Ordinate value as mathematical expression

Scopes

CALC/CURVE

Examples

FREE 1.0 5.5

The table is constant starting at x = 1.0: y = f(x) = 5.5 up to next table entry.

FREE "\$pi" "3.0*cos(0.5*\$_x_)"

The table is not constant startting at x = p: y = f(x) = 3*cos(0.5*x) up to the next table entry. There are 2 predefined variables used, the number p and "_x_", which represents the current abscissa value.

Remark 1:

The formula interpreter contains a number of important, predefined variables and functions, which are generally applicable or applicable in different places.

Remark 2:

The evaluation is done by the mathematical interpreter of TCL. A common mistake is not noticing the difference between an integer operation and a double operation: For example, it results in the value 0 = "2/3" because it is an integer operation (both operands are integers). But we get 0.666667 = "2.0/3" because an operand is a floating point number.