qccvectorgetsymbolprobs.3

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.TH QCCVECTORGETSYMBOLPROBS 3 "QCCPACK" ""
.SH NAME
QccVectorGetSymbolProbs \- calculate probabilities of a list of symbols
.SH SYNOPSIS
.B #include "libQccPack.h"
.sp
.BI "int QccVectorGetSymbolProbs(const int *" symbol_list ", int " symbol_list_length ", QccVector " probs ", int " num_symbols );
.SH DESCRIPTION
.B QccVectorGetSymbolProbs()
accepts a list of symbols, counts the number of times each
symbol occurs in the list, and returns a list of probabilities
based on the observed occurrences of the symbol values in the list.
.LP
More specifically,
.I symbol_list
is the list of symbol values,
.I symbol_list_length
is the length of the symbol list,
.I probs
is the list of probabilities returned,
and
.I num_symbols
is the length of the probability list (one probability for each 
possible symbol).
Each symbol in
.I symbol_list
must be an
.B int
in the range of 0 to
.I num_symbols
- 1.
Suppose that 
.I symbol
is a symbol in the range 0 to
.I num_symbols
- 1;
.B QccVectorGetSymbolProbs()
counts the number of occurrences of
.I symbol
in 
.IR symbol_list .
The probability of 
.IR symbol ,
which is returned in
.IR probs [ symbol ]
is calculated as
.RI count( symbol ") / " symbol_list_length .
.LP
The returned list of probabilities,
.IR probs ,
is a valid probability density it that in sums to 1.0.
.SH "SEE ALSO"
.BR QccPack (3)
.SH AUTHOR
Copyright (C) 1997-2009  James E. Fowler
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