In this section we call the SolveFeedback command directly with a list of inputs, where the second item through to the end of the list represents steps towards solving the first expression in the list.  The result returned is a list of strings.

$\mathrm{with}\left(\mathrm{Grading}\right)\:$

$\mathrm{SolveFeedback}\left(\left[2x+3=4x-5\,2x-4x=-5-3\,-2x=-8\,x=4\right]\right)$

$\left[''''\,''Ok''\,''Ok''\,''Good\; job,\; this\; is\; the\; correct\; solution''\,''Great!\; You\; found\; the\; correct\; solution''\right]$

$\mathrm{SolveFeedback}\left(\left[2x+3=4x-5\,2x-4x=-5+3\,-2x=-2\,x=1\right]\right)$

$\left[''''\,''Check\; this\; step''\,''Ok''\,''Ok''\,''Please\; try\; again.\; This\; is\; not\; the\; correct\; solution''\right]$

$\mathrm{SolveFeedback}\left(\left[2x+y=4y\,2x=3y\,y=\frac{2}{3}x\right]\,\mathrm{variables}=\left[y\right]\right)$

$\left[''''\,''Ok''\,''Good\; job,\; this\; is\; the\; correct\; solution''\,''Great!\; You\; found\; the\; correct\; solution''\right]$

In this example we create an interactive canvas presenting a word problem.  The input equation is not shown.  Note that the t=-2.5 root is not part of the solutions list, as it does not make physical sense.

$\mathrm{with}\left(\mathrm{Grading}\right)\:$

$\mathrm{with}\left(\mathrm{DocumentTools}:-\mathrm{Canvas}\right)\:$

$\mathrm{cv}≔\mathrm{NewCanvas}\left(\left[\mathrm{Text}\left(''Kiera\; throws\; a\; ball\; in\; the\; air\; from\; a\; 11-meter\; tall\; structure.\; The\; height\; of\; the\; ball\; in\; meters\; is\; described\; by\; the\; equation\; \%1.\; Her\; brother,\; Paul,\; catches\; the\; rock\; just\; before\; it\; hits\; his\; head.\; Paul\; is\; 152\; cm\; tall\; and\; is\; standing\; on\; the\; ground.\; How\; long\; was\; the\; rock\; in\; the\; air?''\,s\left(t\right)=-t^2+2t+12.77\right)\,\mathrm{ScriptButton}\left(''Check\; My\; Work''\,''Grading[SolveFeedback](\_canvas,equations=[-t^2\; +\; 2*t\; +\; 12.77\; =\; 1.52],variables=[t],solutions=[t=4.5]);''\,\mathrm{position}=\left[800\,90\right]\,\mathrm{encode}=\mathrm{false}\right)\right]\right)\:$

$\mathrm{ShowCanvas}\left(\mathrm{cv}\,\mathrm{input}=\left[''-t^2\; +\; 2*t\; +\; 12.77\; =\; 1.52''\,''-t^2+2*t+11.25\; =\; 0''\,t=\frac{\left(-2\right)\pm \left(\mathrm{sqrt}\left(2^2-4\left(-1\right)\cdot 11.25\right)\right)}{2\left(-1\right)}\,t=-2.5\,t=4.5\,t\ne -2.5\right]\right)$

The feedback can be generated directly as follows:

$\mathrm{Grading}\left[\mathrm{SolveFeedback}\right]\left(\left[''-t^2\; +\; 2*t\; +\; 12.77\; =\; 1.52''\,''-t^2+2*t+11.25\; =\; 0''\,t=\frac{\left(-2\right)\pm \left(\mathrm{sqrt}\left(2^2-4\left(-1\right)\cdot 11.25\right)\right)}{2\left(-1\right)}\,t=-2.5\,t=4.5\right]\,\mathrm{equations}=\left[-t^2+2t+12.77=1.52\right]\,\mathrm{variables}=\left[t\right]\,\mathrm{solutions}=\left[t=4.5\right]\right)$

The canvas can also be shared via Maple Learn:

$\mathrm{ShareCanvas}\left(\mathrm{cv}\right)$

In this example we create a custom canvas, where the final summary feedback will be directed to a specific spot on the canvas.  Also, as a demonstration, specific output is looked for in order to display a custom message.

$\mathrm{with}\left(\mathrm{DocumentTools}:-\mathrm{Canvas}\right)\:$

$\mathrm{with}\left(\mathrm{Grading}\right)\:$

Check := proc( canvas )
   local feedback := SolveFeedback(canvas,'output'='canvaslist'):
   local script := Script();
   for local C in feedback do
       local msg := C[1];
       local obj := C[2];
       if msg = "Ok" and value(obj:-math) = (factor(x^2-4)=0) then
           msg := "Perfect -- you factored the expression";
       end if;
       SetActive(script,`if`(obj=[],"Summary",obj));
       Annotate(script,msg);
   end do;
   ToString(script);
end proc:

$\mathrm{cv}≔\mathrm{NewCanvas}\left(\left[''Solve\; this\; equation:''\,x^2-4=0\,\mathrm{Math}\left(\left(x-2\right)\left(x+2\right)=0\,\mathrm{border}=\mathrm{true}\right)\,\mathrm{Math}\left(x=2\,\mathrm{border}=\mathrm{true}\right)\,\mathrm{ScriptButton}\left(''Check\; My\; Work''\,\mathrm{Check}\,\mathrm{position}=\left[500\,90\right]\right)\,\mathrm{Math}\left(''Feedback:''\,'\mathrm{custom}'=''Summary''\,\mathrm{position}=\left[500\,90\right]\right)\right]\right)\:$

$\mathrm{ShowCanvas}\left(\mathrm{cv}\right)$

In this example we split the answer areas for a system-of-equations solution into three groups.  Group and filter options are used to grab the input from a different specific column on the canvas for each section.

$\mathrm{with}\left(\mathrm{DocumentTools}:-\mathrm{Canvas}\right)\:$

$\mathrm{with}\left(\mathrm{Grading}\right)\:$

CheckWork := proc(canvas,sys,grp)
    Grading:-SolveFeedback(canvas,'equations'=sys,'group'=grp,'correcteq'=false,'filter'={'readonly'=true});
end proc:

$\mathrm{cv}≔\mathrm{NewCanvas}\left(\left[''Solve\; System''\,''Solve\; the\; system\; of\; equations\; 1\; and\; 2\; by\; first\; solving\; for\; x\; in\; column\; 1,\; then\; use\; that\; value\; in\; column\; 2\; to\; solve\; for\; y,\; and\; finally\; find\; the\; value\; of\; x\; in\; column\; 3.''\,\mathrm{Group}\left(\left[''Equation\; 1:''\,''solve\; for\; x''\,\mathrm{Math}\left(x-y=2\,\mathrm{readonly}\right)\,\mathrm{seq}\left(\mathrm{Math}\left(''''\,\mathrm{border}\right)\,i=1..3\right)\right]\,\mathrm{position}=\left[30\,200\right]\right)\,\mathrm{ScriptButton}\left(''Check\; My\; Work\; 1''\,\mathrm{CheckWork}\,\mathrm{parameters}=\left[\left[x-y=2\right]\,1\right]\,\mathrm{position}=\left[30\,460\right]\right)\,\mathrm{Group}\left(\left[''Equation\; 2:''\,''insert\; value\; of\; x''\,''solve\; for\; y''\,\mathrm{Math}\left(x+y=2\,\mathrm{readonly}\right)\,\mathrm{seq}\left(\mathrm{Math}\left(''''\,\mathrm{border}\right)\,i=1..3\right)\right]\,\mathrm{position}=\left[300\,200\right]\right)\,\mathrm{ScriptButton}\left(''Check\; My\; Work\; 2''\,\mathrm{CheckWork}\,\mathrm{parameters}=\left[\left[y+2+y=2\right]\,2\right]\,\mathrm{position}=\left[300\,460\right]\right)\,\mathrm{Group}\left(\left[''Use\; the\; results\; from\; 1\; and\; 2''\,''to\; find\; the\; value\; of\; x''\,\mathrm{Math}\left(x=\mathrm{NULL}\,\mathrm{readonly}\right)\,\mathrm{seq}\left(\mathrm{Math}\left(''''\,\mathrm{border}\right)\,i=1..3\right)\right]\,\mathrm{position}=\left[600\,200\right]\right)\,\mathrm{ScriptButton}\left(''Check\; My\; Work\; 3''\,\mathrm{CheckWork}\,\mathrm{parameters}=\left[\left[x=2\right]\,3\right]\,\mathrm{position}=\left[600\,460\right]\right)\right]\right)\:$

$\mathrm{ShowCanvas}\left(\mathrm{cv}\right)$