# FUNCTION

# Public

# NUM-DELTA (A B)

|a-b|/max(1,|a|,|b|). Useful for comparing numbers.

# NUM=-FUNCTION (TOLERANCE)

Curried version of num=, with given tolerance.

# MACRO

# Public

# DEFINE-NUM=-WITH-ACCESSORS (CLASS ACCESSORS)

Define a method for NUM=, specialized to the given class, comparing values obtained with accessors.

# DEFINE-STRUCTURE-NUM= (STRUCTURE &REST SLOTS)

Define a NUM= method for the given structure, comparing the given slots.

# GENERIC-FUNCTION

# Public

# NUM= (A B &OPTIONAL TOLERANCE)

Compare A and B for approximate equality, checking corresponding elements when applicable (using TOLERANCE).
Two numbers A and B are NUM= iff |a-b|/max(1,|a|,|b|) <= tolerance.
Unless a method is defined for them, two objects are compared with EQUALP.
Generally, methods should be defined so that two objects are NUM= if they the same class, same dimensions, and all their elements are NUM=.

# VARIABLE

# Public

# *NUM=-TOLERANCE*

Default tolerance for NUM=.