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Index › Suggestions & Bugs › Website, Documentation, Book Bugs › round() ?

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round() ?? (Read 2894 times)

fjen God Member Offline Posts: 965	round() ?? May 2^nd, 2005, 8:45pm what happend to round() ? it's not in the docs and not colored but it works ... F

Markavian

Re: round() ??
Reply #1 - May 4^th, 2005, 2:05am

I noticed this. Round is really important.

Can you document this?

If you've not done a direct implementation can I suggest a feature where you can specify
round(value, decimalplaces);

Because its often useful to round to 1 dp., or 2dp, or to round to the nearest thousand (-3 d.p.).

I've been using this function:
Code:


float round(float number, float decimal) {
  return (float)(round((number*pow(10, decimal))))/pow(10, decimal);
}

(I added the internal round() when I read this post, previously I was using the flawed (int)value method.)

REAS

Re: round() ??
Reply #2 - May 4^th, 2005, 3:05am

here's the code straight from PApplet:

Code:


  static public final float round(float what) {
    return Math.round(what);
  }

  static public final float mag(float a, float b) {
    return (float)Math.sqrt(a*a + b*b);
  }

  static public final float mag(float a, float b, float c) {
    return (float)Math.sqrt(a*a + b*b + c*c);
  }

mag() is also not documented. I'll get them the docs soon...

fry

Re: round() ??
Reply #3 - May 4^th, 2005, 3:46am

hm, mag() was just an internal function.. it returns the magnitude of a vector, but wasn't named for public use. if you have a better name in mind let's figure something out.

re: rounding to a decimal place.. i think this is better left to people who want to write their own function (how do you use it in your own work? i can't say i've ever had to do this.. except for formatting it to print, which is done via nf). the problem is that float values won't give an exact rounding on things, so it's likely to be confusing for folks. but if you want to discuss it further please start a new thread over in the suggestions forum so we can keep track.

Markavian Full Member Offline Posts: 174	Re: round() ?? Reply #4 - May 4^th, 2005, 11:03pm Fry - you're right I just use rounding to decimal place for formatting string outputs - useful when I'm debugging to have values printed up on the screen. I'll just copy & paste my version wherever I need it.

REAS YaBB Moderator Offline Posts: 712 CA	Re: round() ?? Reply #5 - May 6^th, 2005, 7:45pm fixed in the master files. will be uploaded shortly.

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