MaplePrimes - answers and comments on Question, I tried solving this question but i till can't find where I am making a mistake... need ur help pls

Entries of matrix

Robert Israel — Fri, 12 Mar 2010 22:33:00 Z

1) Check your spelling.

2) C2 is not the same as c2.

3) You should use Matrix rather than matrix.

4) You should assign a value to finalmatrix[n,m] after your loop on q, instead of assigning a value to finalmatrix during that loop.

5) You want the procedure to return finalmatrix.

6) "The dimensions n, m, q should be
input parameters in your procedure."

hello robert

kwasidu — Mon, 15 Mar 2010 09:38:37 Z

multiplymatrix := proc (n, m, q, M, N)
local r1, r2, c1, c2, MM, finalmatrix;
r1 := RowDimension(M);
r2 := RowDimension(N);
c1 := ColumnDimension(M);
c2 := ColumnDimesion(N);
finalmatrix := Matrix(1 .. r1, 1 .. c2);
for n to r1 do;
for m to c1 do;
for q to r2 do;
finalmatrix[n, m];
MM := 0;
MM := MM+M[n, q]*N[q, m];
finalmatrix[n, m] := MM;
if c1 <> r2 then print("not calculatable")
else
if (c1 = r2) then return finalmatrix= MM+M[n, q]*N[q, m];
end if ;
end if ;
end do;
end do;
end do;
end proc;

Robert
sorry to disturb you again but can you please tell me where I am still finding faults at and where they are?

Still wrong

Robert Israel — Mon, 15 Mar 2010 10:53:33 Z

1) Check your spelling.

2) Now you have n, m and q as input parameters, but you're not using them as such.
Instead you're using them as loop indices. Never do that. Loop indices should be local variables.

3) Your finalmatrix[n,m]; does nothing.

4) You need to assign an entry of finalmatrix after finishing the loop on q, not inside it.

5) You should check whether c1 = r2 before starting your loops, not within them.
c1 <> r2 should result in an error. not just printing "not calculatable". You can use an error statement to do this.

6) Your return statement makes no sense, and shouldn't be inside the loops. You want to return finalmatrix at the end of the procedure, not in the middle.