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+--- Thread: [CAS] inconsistent evaluation (/thread-7202.html)
[CAS] inconsistent evaluation - compsystems - 11-07-2016 03:00 AM
Hello Hp-Prime user and developers
Flags: Simplify none, exact mode off, and cas mode on
run line by line the following script
Quote:c:=1+(-a-b); [enter] returns 1.-a-b
but
c1:=1-a-b; [enter] returns 1.-a-b
c==c1 [enter] returns true
x1:=1/10.;
y1:=1/9.;
x2:=100/8.;
y2:=100/3.;
x3:=100/4.;
y3:=100/9.;
x:=379/70.;
y:=904/63.;
d:=(y2-y3)*(x1-x3)+(x3-x2)*(y1-y3);
na:=(y2-y3)*(x-x3)+(x3-x2)*(y-y3);
nb:=(y3-y1)*(x-x3)+(x1-x3)*(y-y3);
a:=na/d;
b:=nb/d; [enter] ....
c:=1+(-a-b); [enter] returns 0
but
c1:=1-a-b; [enter] returns −1.7763568394*10^−15
Why when evaluate c <> c1? if c is equal to c1
RE: [CAS] inconsistent evaluation - compsystems - 11-07-2016 03:31 AM
aslo I can not run the following program, I can not find error
PHP Code:
#cas
testP():=
begin
local x1,y1,x2,y2,x3,y3;
local x,y,d;
local na,nb,a,b,c,c1;
x1:=1/10.;
y1:=1/9.;
x2:=100/8.;
y2:=100/3.;
x3:=100/4.;
y3:=100/9.;
x:=379/70.;
y:=904/63.;
d:=(y2-y3)*(x1-x3)+(x3-x2)*(y1-y3);
na:=(y2-y3)*(x-x3)+(x3-x2)*(y-y3);
nb:=(y3-y1)*(x-x3)+(x1-x3)*(y-y3);
a:=na/d;
b:=nb/d;
c:=1+(-a-b);
c1:=1-a-b;
return({ c, c1 });
end;
#end
Who can run the previous program?