printing in 2D (TEXTBOOK)

[compsystems]

Hello, the Xcas, has an cmd to print in 2D printf(),

one of the missing features to incorporate in the firmware of the hp-prime, which is available in ti68k since 1995 (ti92)





xcas examples

PHP Code:

DispG; ClrIO; a:=4; b:=2.5; printf("sqrt(%gen)+(%gen)^2=%gen",a,b,sqrt(a)+b^2 ); Pause; DispHome; 


PHP Code:

testPrint2D_e1():={
        local x,y;
        assume(x,symbol);assume(y,symbol);
        autosimplify(nop);
        DispG; 
        printf; 
        printf( "Console, 2D printing" ); Pause;
        printf( "" );
        printf( "Expr1:" ); 
        printf( 'f(x):=x^3-2*x^2+1*x-1' ); Pause;
        printf( f(x):=x^3-2*x^2+1*x-1 ); Pause;
        printf( f(x) ); Pause;;
        
        printf( "" );
        printf( "Expr2:" ); 
        printf( 'x^3-2*x^2+1*x-1 | x=y' ) Pause;
        printf( x^3-2*x^2+1*x-1 | x=y ); Pause;
        printf( f(y) ); Pause;;
        
        printf( "" );
        printf( "Expr3:" );
        printf( 'g(x):=1/(x+3)' ); Pause;
        printf( g(x):=1/(x+3) ); Pause;
        printf( g(x) ); Pause;
   
        printf( "" );     
        printf( "Expr4:" );
        printf( 'f(g(x))' ); Pause;
        printf( f(g(x)) ); Pause;

        printf( "" );     
        printf( "Expr5:" );        
        printf( 'g(f(x))' ); Pause;
        printf( g(f(x)) ); Pause;
        // DispHome 
        return "Done"
       
}:; 


PHP Code:

testPrint2D_e2():={
   local y,x,list0,expr0,lsolx,y1,y2,sols,test1;
   purge(x,y);
   autosimplify(nop); autosimplify();
   approx_mode(0); approx_mode();
   DispG; ClrIO; printf("Solving a system of two equations"); printf("Solve the following system:");
   list0 := [ y = x^2, y = 2*x + 3 ]; printf(list0);
   printf("substitute y = x² in y = 2x + 3:");
   expr0 := subst(list0(2),list0(1)); printf(expr0);
   printf("substract 2x + 3:");
   expr0 := expr0-(2*x + 3); printf(expr0);
   printf("simplify:");
   expr0 := simplify(expr0); printf(expr0);
   printf("factor:"); 
   expr0 := factor(expr0); printf(expr0);
   printf("zero factor theorem:"); 
   lsolx := [ part(left(expr0),1)=0, part(left(expr0),2)=0 ]; printf(lsolx);
   printf("First factor plus 3, second minus 1:");
   lsolx := [lsolx(1)+3, lsolx(2)-1 ]; printf(eval(lsolx,1));
   printf("simplify"); printf("x values:");
   lsolx := simplify(lsolx); printf(lsolx);
   printf("y values:"); printf("Replace x values in the system, firts equation"); 
   y1 := subst(list0(1),lsolx(1)); printf(y1);
   printf("Replace x values in the system, second equation");
   y2 := subst(list0(1),lsolx(2)); printf(y2);
   printf("Solutions shaped as a array");
   sols:=[[lsolx(1),y1],[lsolx(2),y2]]; printf(sols); 
   printf("Checking results:"); printf("Replace x and y values in the system, firts equation"); 
   test1 := subst(list0(1),[sols(1,1),sols(1,2)]); printf(test1);
   printf("Evaluate:");
   test1 := evalb(test1); printf(test1);
   printf("Replace x and y values in the system, second equation"); 
   test1 := subst(list0(1),[sols(2,1),sols(2,2)]); printf(test1); 
   printf("Evaluate:");
   test1 := evalb(test1); printf(test1);
   sols := solve([ y = x^2, y = 2*x + 3 ],[x,y]); printf("Solutions:"); printf(sols);
   printf("Solutions shaped as a boolean expression:");
   sols := list2exp(sols,[x,y]); printf(eval(sols,1));
   printf("Graphing"); 
   plot([x^2,2*x+3],x); 
   // DispHome 
   return("Done"); 
}:;