The calculator interprets the
function as -10.5sin(3.14/6*(x-10))+46.5,
where (x-10) belongs to numerator.
You should try this in a update calculator.

I hope your problem will be solved.

Check out the attached file. Differentiate the function, and it leaves two negative signs at the beginning. This doesn't actually affect the function at all in this case, but I'm not sure if there are other functions that might be broken by this.

-James

I think I've found another version of this bug that remains in the most recent version of Graph.

Open the attached file, right-click the function and differentiate it. The correct function will display.

Next, double click the function, and then just choose OK. The function changes to the wrong one.

It seems very similar to the bug you fixed before.

Thanks again,

-James

I didn't actually compile the code, but this is a general idea of how I think you could add it. Note: this is from the v4.3 software posted on sourceforge, I don't know if much has changed since then.

In Unit1.cpp

in the function

void __fastcall TForm1::Image1MouseDown(TObject *Sender, TMouseButton Button,
    TShiftState Shift, int X, int Y)

    case mbRight:
      if(CursorState != csMoveLabel && CursorState != csMoveLegend)
      {
        TPoint Pos = Image1->ClientToScreen(TPoint(X, Y));
        if(Data.FindLabel(X, Y))
          PopupMenu3->Popup(Pos.x, Pos.y);
        else if(Draw.InsideLegend(X, Y))
          PopupMenu4->Popup(Pos.x, Pos.y);

        SetCursorState(csIdle);
      }else if(CursorState == csIdle)
        SetCursorState(csMove);

That should allow you to drag the screen as long as the mouse is not on top of any labels or legend.

Now to take care of letting the mouse button up add the if(Button == mbRight) part after the switch block for the mbLeft mouse button check in the function

void __fastcall TForm1::Image1MouseUp(TObject *Sender, TMouseButton Button,
    TShiftState Shift, int X, int Y)

      ...
      case csZoomWindow:
        SetCursorState(csIdle);
        if(X != xZoom && Y != yZoom)
          //Zoom to user selected window;don't change coordinates
          ZoomWindow(Draw.xCoord(Shape1->Left), Draw.xCoord(Shape1->Left+Shape1->Width), Draw.yCoord(Shape1->Top+Shape1->Height), Draw.yCoord(Shape1->Top));
        break;
    }
  if(Button == mbRight)
    switch(CursorState)
    {
      case csMoving:
        SetCursorState(csMove);
        break;
    }

Like I said, I can't compile this to test it so I'm hoping its right. All in all it will give one more capability and add an extra zest of user friendliness.

Thanks for reporting this problem.