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wp34s binomial bug



#6

0.5 STO J
2 STO K
2 h PROB Binom
Gives "Domain error" instead of 1.
Binom_u also gives incorrect result.

#7

First of all: which firmware version do you refer to?

I get the following results with v3.2 3405.

Just to be sure:

  • "Binom"  evaluates the lower CDF, i.e. the sum of all probabilities from k = 0...X
  • "Binomu" evaluates the upper CDF, i.e. the sum of all probabilities from k = X...n
  • "Binomp" evaluates the PDF, i.e. the single probability for k = X.

All this works fine here:
 0,5 STO J
2 STO K
 
0 Binomp => pdf(0) = 0,25
1 Binomp => pdf(1) = 0,5
2 Binomp => pdf(2) = 0,25
 
0 Binom => lower cdf(0) = 0,25 (= pdf(0))
1 Binom => lower cdf(1) = 0,75 (= pdf(0) + pdf(1)) 
2 Binom => lower cdf(2) = 1 (= pdf(0) + pdf(1) + pdf(2))
 
0 Binomu => upper cdf(0) = 1 (= pdf(0) + pdf(1) + pdf(2))
1 Binomu => upper cdf(1) = 0,75 (= pdf(1) + pdf(2))
2 Binomu => upper cdf(2) = 0,25 (= pdf(2))
What do you get?

Dieter


Edited: 22 Sept 2013, 2:34 p.m.


#8

Hi,

I also checked with mine: Version 3.2 3450

Results:


  0  Binom    => 0,25
1 Binom => 0,75
2 Binom => Domain Error

Cheers,

Miguel

#9

I discovered it on actual unit, which I do not have with me, but tried it with latest build in emulator (3450) before posting.

I get Domain error on Binom(2) everything else works like your example.

#10

Bug fixed.

- Pauli


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