Graphing Calculator

[TianCaiWuDi]

A couple of questions about making a graphing calculator in Turing.

1. How to find the appropriate range of x/y?
2. How to graph a parabola?

Thanks in advance.

[Asherel]

Well, seeing as you want to know Parabolas, Nick has a good program to do them.

However you will need to ask him to copy or use your code.

Nick's Parabola

And if you are looking for the X and Y corrdinates of the standard output window, look into 1st Quadrants. It's 600 by 400 pixels.

Hopefully this is what you are after.

[Clayton]

Make sure you know how to do translations to any given function. If you don't, then you're just asking for trouble.

[andrew.]

I made a parabola grapher a while back. It doesn't have the all the transformations of the parabola but by changing the variables, you can move it vertically and stretch or compress it. I was thinking of redoing it though. Make it fully functional.

Here is the code:

Turing:

setscreen ("graphics:max,max") View.Set ("title:Parabola Grapher") var c, y, d, a, b : real var username : string := Sys.GetUserName a := -51 b := 0 c := 0 d := 1 put "Welcome ",username,"," put "" put "The equation of a parabola is as follows:" put "y=ax**2+b" put "" put "Enter a value for a." get d put "Enter a value for b." get c cls for i : 3 .. maxx by 10     drawline (i, 0, i, maxx, grey) end for for j : 0 .. maxy by 10     drawline (0, j, maxx, j, grey) end for drawline (maxx div 2, 0, maxx div 2, maxy, black) drawline (0, maxy div 2, maxx, maxy div 2, black) for x : -maxx .. maxx     y := d * x ** 2 + c     a := x - 1     b := x - 1 ** 2     drawline (round (a + maxx div 2), round (d * a ** 2 + c + maxy div 2), round (x + maxx div 2), round (y + maxy div 2), black)     drawfilloval (round (x + maxx div 2), round (y + maxy div 2), 2, 2, red) end for

[Mackie]

I think you should work on naming conventions.

code:

put "Enter a value for a." get d put "Enter a value for b." get c

I think there is something wrong here.