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POR package VLMC dies if state space size exceeds 27
 

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  1. POR package VLMC dies if state space size exceeds 27
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    <p>I am using VLMC to fit some Markov models and it dies as soon as the alphabet size reaches 28. I thought this was due to using a single letter in the alphabet by default, but it has the same behavior with "code1char = FALSE". This is true for me on real data as well as this fake example.</p> <pre><code>library(VLMC) # works fine ins &lt;- sample(seq(1,27,1),50000,replace=T) vlmc(ins, dump = 1,threshold.gen = 2, debug = TRUE) #core dump ins &lt;- sample(seq(1,28,1),50000,replace=T) vlmc(ins, dump = 1,threshold.gen = 2, debug = TRUE) </code></pre> <p>Any ideas?</p> <p>The seg fault looks like this BTW. It looks to me like the alphabet after z is being mapped to NA which is causing an array bound issue.</p> <pre><code>library(VLMC) sc &lt;- 10 amp &lt;- 13 x &lt;- round(amp*sin(seq(0,2*sc*pi,0.01))) x &lt;- amp + x + rpois(NROW(x),1) length(table(x)) length(x) vlmc(x, dump = 1,threshold.gen = 2, debug = TRUE) vlmc: Alpha = 'abcdefghijklmnopqrstuvwxyzNANANANANA' ; |X| = 31 vlmc: ctl.dump = 4 11 vlmc: n = |data| = 6284, cutoff{prune} = 21.8865, threshold{gen} = 2 vlmc: |alphabet| = 31, alphabet = abcdefghijklmnopqrstuvwxyzNA generating... *** caught segfault *** address 0x0, cause 'memory not mapped' Traceback: 1: .C("vlmc_p", data = Data, n = n, threshold.gen = as.integer(threshold.gen), cutoff.prune = as.double(cutoff.prune), alpha.len = as.integer(alpha.len), alpha = as.character(Alpha), debug = as.integer(as.logical(debug)), dump.flags = as.integer(c(dump, ctl.dump)), size = integer(4), PACKAGE = "VLMC") 2: vlmc(x, dump = 1, threshold.gen = 2, debug = TRUE) </code></pre>
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    1. USJesse
    1. USJesse
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      1. POR package VLMC dies if state space size exceeds 27
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    1. COsounds like an email to `maintainer(VLMC)` is in order (assuming this isn't documented in the function somewhere).
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      1. POR package VLMC dies if state space size exceeds 27
      1. USChase
    2. COR version 2.15.0 (2012-03-30) Copyright (C) 2012 The R Foundation for Statistical Computing ISBN 3-900051-07-0 Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)
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      1. POR package VLMC dies if state space size exceeds 27
      1. USJesse
    3. COIf you look more carefully, you will see that also the |X| = 27 is not quite ok. The limit is currently really at 26. We hadn't seen a case of more than very few letters.. But yes, several years later, I agree that this was too lazy programming (("nobody will ever use much larger state spaces"... what a silly hope !))
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      1. POR package VLMC dies if state space size exceeds 27
      1. USMartin Mächler
 

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