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Extends =~ to complex numbers

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This is a (variation of a) fix from David van Horn.

Closes PR 11547.
This commit is contained in:
Mike Sperber 2010-12-26 09:03:10 +01:00
parent 7282e19178
commit d5c58d9f82
2 changed files with 7 additions and 7 deletions
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6
collects/lang/private/beginner-funs.rkt
View File

@ -484,10 +484,10 @@
(eqv? (any any -> boolean)
"to determine whether two values are equivalent from the"
" perspective of all functions that can be applied to it (extensional)")
((beginner-=~ =~) (real real non-negative-real -> boolean)
"to check whether two real numbers are within some amount (the third argument) of either other")
((beginner-=~ =~) (number number non-negative-real -> boolean)
"to check whether two numbers are within some amount (the third argument) of either other")
((beginner-equal~? equal~?) (any any non-negative-real -> boolean)
"to compare like equal? on the first two arguments, except using =~ in the case of real numbers")
"to compare like equal? on the first two arguments, except using =~ in the case of numbers")
(eof eof
"the end-of-file value")
(eof-object? (any -> boolean)

8
collects/lang/private/teachprims.rkt
View File

@ -276,8 +276,8 @@ namespace.
(current-continuation-marks))))])
(let ? ([a x][b y])
(cond
[(real? a)
(and (real? b)
[(number? a)
(and (number? b)
(beginner-=~ a b epsilon))]
[(procedure? a)
(fail "first argument of equality cannot be a procedure, given ~e" a)]
@ -318,8 +318,8 @@ namespace.
(define-teach beginner =~
(lambda (a b c)
(check-three a b c '=~ real? 'real real? 'real positive-real? 'non-negative-real)
(<= (- a c) b (+ a c))))
(check-three a b c '=~ number? 'number number? 'number positive-real? 'non-negative-real)
(<= (magnitude (- a b)) c)))
(define-teach beginner equal~?
(lambda (a b c)