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Old 21st April 2018, 21:14   #1  |  Link
wthreex
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Generate a random number

Is there any function for generate random number in avisynth ?
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Old 21st April 2018, 21:20   #2  |  Link
ChaosKing
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http://avisynth.nl/index.php/Internal_functions#Rand
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Old 21st April 2018, 21:48   #3  |  Link
wthreex
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Quote:
Originally Posted by ChaosKing View Post
Thanks, What is the syntax if i want to use generate align position ?

Code:
Subtitle("Hello world!", align= rand(9))
I tried it , But Hello World only goes on the middle video and doesn 't change and every time it makes a same value...

Last edited by wthreex; 21st April 2018 at 21:55.
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Old 21st April 2018, 22:48   #4  |  Link
ChaosKing
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try seed=true. With seed=false it did change 1-2 times, but even after restarting the vdub it stayed at 5. So maybe it's a bug?
This works much better
Code:
r=rand(max=9, seed=true) 
version() 
Subtitle(String(r), align= round(r))
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Old 22nd April 2018, 00:44   #5  |  Link
StainlessS
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Code:
#r=rand(max=9, seed=true)  # Int, Range 0 to 8, no good (result is modulo 9)
r=rand(max=9,seed=true)+1  # Int, Range 1 to 9
version()
Subtitle(String(r), align=r) # Align=0, is illegal
EDIT: Might be better for some requirements
Code:
rand(seed=true) # One time Randomize()
#
r=rand(max=9)+1  # Int, Range 1 to 9
version()
Subtitle(String(r), align=r) # Align=0, is illegal
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"Some infinities are bigger than other infinities", but how many of them are infinitely bigger ???

Last edited by StainlessS; 25th April 2018 at 20:04.
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Old 25th April 2018, 15:35   #6  |  Link
wthreex
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Thanks.
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Old 25th April 2018, 18:22   #7  |  Link
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Code:
#r=rand(max=9, seed=true)  # Int, Range 0 to 8, no good (result is modulo 9)
r=rand(max=9,seed=true)+1  # Int, Range 1 to 9
version()
Subtitle(String(r), align=r) # Align=0, is illegal
r=rand(max=8,seed=true)+1 # Int, Range 1 to 9
version()
Subtitle(String(r), align=r) # Align=0 is illegal, 10 too.

In the end to have a randomly moving watermark, rand would have to be evaluated for every frame,
and position be calculated from that, maybe not using align, but this hasn't been asked.
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Last edited by Emulgator; 25th April 2018 at 18:26.
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Old 25th April 2018, 19:36   #8  |  Link
StainlessS
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Quote:
r=rand(max=8,seed=true)+1 # Int, Range 1 to 9
version()
Subtitle(String(r), align=r) # Align=0 is illegal, 10 too.
Not quite.

Code:
BINGOS=0
Rand(seed=true)
For(i=1,50) {
    r=Rand(Max=8)+1      # Int, range 1 to 8
    BINGOS=(r==9)?BINGOS+1:BINGOS
    RT_DebugF("%d] %d %s",i,r,r==9?"BINGO":"")
}
RT_DebugF("\nNumber of 9's = %d",BINGOS)

return version
Code:
00000005    1.23400939  RT_DebugF: 1] 2
00000006    1.23405778  RT_DebugF: 2] 7
00000007    1.23410249  RT_DebugF: 3] 1
00000008    1.23414886  RT_DebugF: 4] 4
00000009    1.23418772  RT_DebugF: 5] 6
00000010    1.23423040  RT_DebugF: 6] 7
00000011    1.23427629  RT_DebugF: 7] 5
00000012    1.23431504  RT_DebugF: 8] 8
00000013    1.23435771  RT_DebugF: 9] 2
00000014    1.23440421  RT_DebugF: 10] 5

...

00000044    1.23567069  RT_DebugF: 40] 4
00000045    1.23570931  RT_DebugF: 41] 8
00000046    1.23575175  RT_DebugF: 42] 1
00000047    1.23579741  RT_DebugF: 43] 4
00000048    1.23583603  RT_DebugF: 44] 6
00000049    1.23587847  RT_DebugF: 45] 4
00000050    1.23592424  RT_DebugF: 46] 4
00000051    1.23596275  RT_DebugF: 47] 2
00000052    1.23600531  RT_DebugF: 48] 4
00000053    1.23605096  RT_DebugF: 49] 2
00000054    1.23608959  RT_DebugF: 50] 5
00000055    1.23612595  RT_DebugF:
00000057    1.23616958  RT_DebugF: Number of 9's = 0
nuther one
Code:
ColorBars.KillAudio.ShowFrameNumber
Rand(seed=true) # seed only once (As 'Randomize()' in other languages)
Global BINGOS=0
SSS="""
    n=current_frame
    r=rand(max=9)+1  # Int, Range 1 to 9
    Global BINGOS=(r==9)?BINGOS+1:BINGOS
    RT_DebugF("%d] %d",n,r)
    Subtitle(String(n,"%.0f]")+String(BINGOS," BINGOS=%.0f : ")+String(r,"R=%.0f"), align=r) # Align=0, is illegal
    return last
"""
return ScriptClip(SSS)
EDIT: Results of Rand(max) are modulo max. [The remainder after SomeBigNumber / max]
Quote:
Rand

Rand([int max] [, bool scale] [, bool seed])
Returns a random integer value. All parameters are optional.

max
sets the maximum value+1 (default 32768) and can be set negative for negative results. It operates either in scaled or modulus mode (default scale=true only if Abs(max) > 32768, false otherwise).
Code:
Rand(max=n)   # Range 0 to n-1
Rand(max=n)+1 # Range 1 to n
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"Some infinities are bigger than other infinities", but how many of them are infinitely bigger ???

Last edited by StainlessS; 25th April 2018 at 19:58.
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