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[Question] Random choices 
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Mabelma95
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Joined: Thu Mar 05, 2009 10:49 am
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Post [Question] Random choices
Hi guys so I'm trying to do a test on math.random and I need the fla to change the score to one when the last sword thing is pressed, but it's not working and I really don'w know why. I'm posting the code and all of that. I really need help. If you need to contact me here's my email:[email protected] in advance.

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Sun May 03, 2009 2:13 pm
Evilagram
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Post Re: [Question]Random choices
I have no idea what on earth you're trying to do. Could you try being more clear?

If you need to set the sorce to one, just say, on(release){score = 1;}

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Sun May 03, 2009 3:35 pm
Mabelma95
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Post Re: [Question]Random choices
I need a number for 1 to 3 randomly. I tryed using math.random but it didn't work.Is the attachement working? If not tell me I'll give you a link to it. If you need anything else just ask.

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Sun May 03, 2009 4:15 pm
x2i
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Post Re: [Question]Random choices
myNum = random(3)+1; should work, its not the best method but it'll do. Cue Evilagrams algorithm for Math.random() method...
Sun May 03, 2009 4:31 pm
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Mabelma95
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Post Re: [Question]Random choices
Thanks but I have a question why to I need to write +1? I only need 3 numbers.
It still doesn't work.

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Sun May 03, 2009 6:28 pm
Evilagram
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Post Re: [Question]Random choices
Ow. That's not how Math.Random works at all.

If you want a number equal to exactly 1, 2, or 3, then the correct method would be:

Score = Math.round(Math.random()*3+1);

If you want it to add to the current score, do this:

Score = Score + Math.round(Math.random()*3+1);


To explain the Math.random method a bit, it randomly generates an irrational number from 0 to 1. Just multiply by the range which you want (1-3 has a range of three) and add to the lowest number of the range (1 in this case). Math.round rounds the number to the neared value.

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Sun May 03, 2009 9:47 pm
x2i
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Post Re: [Question]Random choices
Agreed that your Math.random() method works better but I think you'll find that writing random(5); for example will in fact generate a random number between 0 and 4, then add one will make it between 1 and 5. Try it.
Mon May 04, 2009 11:34 am
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Evilagram
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Post Re: [Question]Random choices
No it doesn't. It just generates a number between 1 and 0. Have you tried your own code?

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Mon May 04, 2009 11:37 am
x2i
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Post Re: [Question]Random choices
Evilagram wrote:
No it doesn't. It just generates a number between 1 and 0. Have you tried your own code?


Okay copy and paste this into the movies first frame and run it multiple times:

Code:
trace(random(5)+1);


Now tell me it doesn't generate a random number from 1 to 5 - I use it all the time when I don't want to get too complicated with the random numbers so I know it works!
Mon May 04, 2009 11:48 am
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Evilagram
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Post Re: [Question]Random choices
Wow, that's exactly the code I wrote. I put it on two frames, so it would loop and run every frame. Then I tested the movie. Here's the output:

Code:
1.83251965651289
1.05784177687019
1.82829308742657
1.09476363891736
1.51326166000217
1.76205865899101
1.47127442341298
1.81924107857049
1.21436914987862
1.33759195217863
1.1698354515247
1.60859565623105
1.12506395811215
1.64765789406374
1.04340737732127
1.377713478636
1.71885367482901
1.65411084704101
1.18565026810393
1.69855040498078
1.64936943724751
1.60159979714081
1.09117275243625
1.55072051892057
1.96043380629271
1.15133056230843
1.58936345484108
1.23770548310131
1.39707113429904
1.97875383356586
1.25028646877035
1.43414258677512
1.94073739554733
1.46266365004703
1.79210716485977
1.00096549233422
1.28844895213842
1.7744080144912
1.99712839070708
1.87190171238035
1.99788088537753
1.51939338818192
1.74242471903563
1.45953326532617
1.09379816940054
1.82515385374427
1.62607746338472
1.99667170923203
1.93607832165435
1.28340175841004
1.5627880031243
1.17103869095445
1.77476005861536
1.90781844360754
1.36015161452815
1.7965395511128
1.99270281288773
1.73701670859009
1.30332432501018
1.71065655397251
1.75418890966102
1.70504831476137
1.36256452091038
1.47751034144312
1.48008329980075
1.96622215397656
1.77058479189873


The code used was as follows

Code:
trace(Math.random(5)+1);


Funny. It's not working as advertised.

Here's the documentation on the random method:

http://www.adobe.com/support/flash/acti ... ry466.html

There are no parameters for the random method. If you think I screwed up, here's the fla:

http://dl.getdropbox.com/u/416986/temp/RandomTest.fla

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Mon May 04, 2009 11:56 am
x2i
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Post Re: [Question]Random choices
Sorry but you are obviously misreading what I write, I wrote this
Code:
trace(random(5)+1);

Not this
Code:
trace(Math.random(5)+1);


random() and Math.random are two different things.
Mon May 04, 2009 11:58 am
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Evilagram
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Post Re: [Question] Random choices
Weeeeeeeelllllll, f***. You quoted code from flash 4.

http://www.adobe.com/support/flash/acti ... ry630.html

Quote:
This function is deprecated in Flash 5; use of the Math.random method is recommended.


It's a faulty implementation. Perhaps it generates less random numbers or lags more, f*** if I know. One thing for certain is that it can only generate integers, not irrational numbers, meaning that it's useless for a number of applications.

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Mon May 04, 2009 12:17 pm
x2i
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Post Re: [Question] Random choices
Which is why I agreed with you that the Math.random method is far more efficient, but from experience with using flash for random number generating it works better for random numbers that are hidden behind the scenes - for example I use it to make events happen randomly like so:

Code:
if(random(100) < 10) {
  //Do Something
}


Works well enough for me and for a majority of users here learning flash it would probably work just as well too, but I guess teaching them the modern techniques will be better for them in the long run rather than using deprecated code all the time.
Mon May 04, 2009 12:26 pm
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Evilagram
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Post Re: [Question] Random choices
I just do,

Code:
if(Math.random() < .5){
//s*** happens
}


EDIT: Ought to say more than that. Because it has a wider range and crap, it's more random, or something along those lines.

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Mon May 04, 2009 12:50 pm
Huntragon

Joined: Mon Aug 11, 2008 11:33 am
Posts: 22
Post Re: [Question] Random choices
Try this code.I think is best than x21 and evilgram,but is a bit more complicated.

Code:
Math.round(Math.random()*3+1)
Tue May 05, 2009 12:36 am
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