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Testing ANSWER cmd
01-29-2017, 05:37 PM (This post was last modified: 01-29-2017 08:17 PM by compsystems.)
Post: #1
Testing ANSWER cmd
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
eq2solanswer;
      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("factor(eq2): "+answer);

    print(
"");
    
answer:=answer/2// ->(2*(x+y)/2) = 14
    
print("Ans/2: "+answer);
    
answer:=simplify(answer); // -> (x+y) = 14
    
print("simplify(Ans): "+answer);

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

    print(
"");
    
//answer:= (eq1|sol);
    
answer:=subst(eq1,sol); //  -> (x*(-x+14)) = 45
    
print("subst(eq1,answer): "+answer);
    
answer:=simplify(answer); // -> (-x^2+14*x) = 45
    
print("simplify(Ans): "+answer);

    print(
"");
    
sol:=solve(answer,x); // -> {5,9}
    
print("sol(Ans,x): x1,2="+sol);

    print(
"");
    print(
"test solutions");
    
answer:=(eq1|{x=sol[1], y=sol[2]});
    print(
"eq1: "+answer);
    
answer:=evalBool(answer,'=','==');
    print(
"eq1: "+answer);

    print(
"");
    
answer:=(eq2|{x=sol[1], y=sol[2]});
    print(
"eq2: "+answer);
    
answer:=evalBool(answer,'=','==');
    print(
"eq2: "+answer);
    return 
"Done";
  
end;
#end

#cas
  
evalBoolexpr1str1str2 ):=
  
begin
   
return( iftesubst(expr1str1str2 ), "TRUE""FALSE") );
  
end;
#end 
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01-30-2017, 05:07 PM
Post: #2
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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