[Fox]

This is an example of code used in GAME.CON:

  ifrnd 64
  {
    ifnosounds
      soundonce TOUGHGALSND1
  }
  else
    ifrnd 64
  {
    ifnosounds
      soundonce TOUGHGALSND2
  }
  else
    ifrnd 64
  {
    ifnosounds
      soundonce TOUGHGALSND3
  }
  else
    ifnosounds
      soundonce TOUGHGALSND4

This makes me raise the question of how exactly "ifrnd" used in conjunction with "else" works.

In the example below, if I subtract the chances of each "ifrnd" based on the last one, I would have this result:
- 1st sound: 25% of chances
- 2nd sound: 18% of chances
- 3rd sound: 14% of chances
- 4th sound: 42% of chances

Or was this code meant to provide equal chances of 25% for each sound?

[Danukem]

Your analysis of the percentages is correct, except that the last only plays "ifnosounds".

ifrnd works like any other if condition.

If you wanted there to be 25% chance per sound, you would structure it like this:

ifrnd 128 { ifrnd 128 sound ONE else sound TWO } else { ifrnd 128 sound THREE else sound FOUR }

[rasmus thorup]

If you don't want to use the ifrnd command you can use the randvar command.

[Jimmy]

That's what I do now. I really don't trust the ifrnd command, and ultimately it gives you less control in some situations where vars are needed.

[Zaxtor]

ifrnd I think is a randomlized delayer.

Ifcount 100 with ifrnd 50 { blah blah blah }

Will make ifcount goes 100 (as normal) or makes it go 100 2x times. Like 200.
Is a randomlizing thing.

Not sure.

[Mblackwell]

Captain Awesome, on 28 August 2011 - 03:41 PM, said:

That's what I do now. I really don't trust the ifrnd command, and ultimately it gives you less control in some situations where vars are needed.

I use it for quick randomizations that I don't care much about (changing enemy states, etc). Otherwise it's off to randvar land. Particularly if it's part of a clever formula.

[rasmus thorup]

Zaxtor, on 28 August 2011 - 07:53 PM, said:

ifrnd I think is a randomlized delayer.

Ifcount 100 with ifrnd 50 { blah blah blah }

Will make ifcount goes 100 (as normal) or makes it go 100 2x times. Like 200.
Is a randomlizing thing.

Not sure.

I suggest that you read the ifrnd page on eduke wiki. And then all the posts in here.

[Zaxtor]

ok.

rnd is symbole for RaNDom

[rasmus thorup]

Are you serious?

[Zaxtor]

Looked for its meaning

ifrnd <value> { do something } else { do something else }
An if condition stating the probability of it 'doin somethin!' in this case.
NOTE: It's out of 256 as max, so 'ifrnd 256 = 100%', and 'ifrnd 128 = 50%'
This command must only be used in synchronised code or you will cause desyncs. for display code use displayrand instead.


I mean its usage without else.

Like ifcount xxx ifrnd xxx { your sprite's behavior }.

I used like that and it sorta acts randomly.

256 (100%) = 128 (50%)
So I guess is the chance it will act. if fails it reset until it succeed.
I think.

[Mblackwell]

Keep in mind that it runs every game tic too. So every time it's looking through your actor code it's checking if it should change. So ifrnd 128 without any other conditions means it has a 50% chance of happening 30 times in a single second.