JS Quadratic Curve

Asked Feb 25 '13 at 20:48

Active Feb 25 '13 at 20:48

Viewed 239 times

So far I've been able to make a straight line graph sort of thing using circles and assigning to them a random x coordinate, and setting y equal to x. This worked.

The trouble I'm having is with Math.pow() to do powers of x. It doesn't seem to be working. The circles don't appear anywhere, but the screen doesn't even get stretched (which is what I'd expect to happen if shapes go outside the boundaries).

var rangeCX = Math.round(Math.random() * 500);

var resultCX = rangeCX;
var resultCY = Math.pow(rangeCX,2);

circle.setAttribute("cx",resultCX);
circle.setAttribute("cy",resultCY);

I'm using SVG to display the circles.

asked Feb 25 '13 at 20:48

Maurice Tempelsman

Try putting your code in JSFiddle. – Andrew Mao Feb 25 '13 at 21:25
1

Wouldn't that make your average y-value around 62,500? That might explain why they aren't appearing on your screen. (Unless you have quite some monitor!) – Scott Sauyet Feb 25 '13 at 21:26
1

Does it work for small values of rangeCX, like 1 or 2? Try changing line 1 to `var rangeCX = 2;`, see if you get a plot. – James Feb 25 '13 at 21:26
Haha yes Scott, that monitor would be a health hazard! – Maurice Tempelsman Feb 25 '13 at 21:31
OK. The problem was I was using a constant after "* 500". But you guys were still correct, so if you want to reply then I can mark as answered. – Maurice Tempelsman Feb 25 '13 at 21:48

JS Quadratic Curve

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