steve@gec-mi-at.co.uk (Steve Lademann) (11/11/88)
Description: The `a' function (arctangent) of the math library for
bc supplied with 4.3BSD doesn't work properly.
Repeat by: Run bc with the libaray switch (`bc -l') and try any argument
to the `a' function. It always gives the same result! e.g.
a(1)
.7853981633...
a(.2)
.7853981633...
Fix: Apply the following patch to the library /usr/lib/lib.b and
/usr/src/usr.lib/lib.b
*** /usr/lib/lib.b.old Fri Nov 11 09:52:20 1988
--- /usr/lib/lib.b Fri Nov 11 09:53:55 1988
***************
*** 125,133 ****
define a(x){
auto a, b, c, d, e, f, g, s, t
if(x==0) return(0)
! if(x==1)
! if(scale<52)
return(.7853981633974483096156608458198757210492923498437764/1)
t = scale
f=1
while(x > .5){
--- 125,133 ----
define a(x){
auto a, b, c, d, e, f, g, s, t
if(x==0) return(0)
! if(x==1) if(scale<52) {
return(.7853981633974483096156608458198757210492923498437764/1)
+ }
t = scale
f=1
while(x > .5){
Steve Lademann |Phone: 44 727 59292 x4326
Marconi Instruments Ltd |UUCP : ...mcvax!ukc!hrc63!miduet!steve
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