01-29-2017, 05:37 PM (This post was last modified: 01-29-2017 08:17 PM by compsystems.)
Post: #1
 compsystems Senior Member Posts: 1,329 Joined: Dec 2013
Hello, the following statements Written on CAS history

print("test ANS cmd");
id0:=0+1;
print("ans1: "+Ans); // ans1: 1
id0:=1+1;
print("ans2: "+Ans); // ans2: 2
id0:=2+1;
print("ans3: "+Ans); // ans3: 3

show in the terminal view

test ANS cmd
ans1: 1
ans2: 2
ans3: 3

But within a program

PHP Code:
#cas

anscmd():=

begin

print;
print(
"test ANS cmd");

id0:=0+1;
print(
"ans1: "+Ans); // ans1: 1

id0:=1+1;
print(
"ans2: "+Ans); // ans2: 2

id0:=2+1;
print(
"ans3: "+Ans); // ans3: 3
#end

test ANS cmd
ans1: 0
ans2: 0
ans3: 0

Why?

The following CAS code Requires storing each statement in an identifier, and you can not use 'Ans' Cmd =(
PHP Code:
#cas

script1():=

begin
local eq1
print;

purge(x,y);
print(
"Find the dimensions of a rectangle whose area is 45 and its perimeter 28");
print(
"METHOD 1 (Algebraic solution, stepwise)");
print(
"Let x = long, y = width");
print(
"");

print(
"The equations are:");

eq1:=x*y=45;
print(
"eq1: "+eq1);

eq2:=2x+2y=28
print(
"eq2: "+eq2);

print(
"");

answer:=factor(eq2); // -> (2*(x+y)) = 28

print(
"");

print(
"");

sol:= y=solve(answer,y)[1]; //  y = (-x+14)

print("sol(Ans,y): "+sol);

print(
"");

answer:=subst(eq1,sol); //  -> (x*(-x+14)) = 45

print(
"");

sol:=solve(answer,x); // -> {5,9}

print("sol(Ans,x): x1,2="+sol);

print(
"");
print(
"test solutions");

print(

print(

print(
"");

print(

print(
return
"Done";

end;
#end

#cas

evalBoolexpr1str1str2 ):=

begin

return( iftesubst(expr1str1str2 ), "TRUE""FALSE") );

end;
#end
01-30-2017, 05:07 PM
Post: #2
 KeithB Member Posts: 298 Joined: Jan 2017
RE: Testing ANSWER cmd
I think ANS is a keyboard only thing that is there for convenience. It does not work on my HP71B, either, though that has a much clearer demarcation between "BASIC mode" and "CALC mode".

Though, I really like the () notation to get ans into an equation.
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