function [matrix, matrixInfo] = pam100
%PAM100 substitution matrix in 1/2 bit units,
%   Expected score = -1.99, Entropy = 1.18 bits
%   Lowest score = -9, Highest score = 12
%
%   Order:
%   A  R  N  D  C  Q  E  G  H  I  L  K  M  F  P  S  T  W  Y  V  B  Z  X  *
%
%   [MATRIX,MATRIXINFO] = PAM100 returns a structure of information about
%   the matrix with fields Name, Scale, Entropy, ExpectedScore, LowestScore,
%   HighestScore and Order.

% Source:  ftp://ftp.ncbi.nih.gov/blast/matrices/
%   $Revision: 1.6 $ 

matrix = [...
   4 -3 -1 -1 -3 -2  0  1 -3 -2 -3 -3 -2 -5  1  1  1 -7 -4  0 -1 -1 -1 -9;...
  -3  7 -2 -4 -5  1 -3 -5  1 -3 -5  2 -1 -6 -1 -1 -3  1 -6 -4 -3 -1 -2 -9;...
  -1 -2  5  3 -5 -1  1 -1  2 -3 -4  1 -4 -5 -2  1  0 -5 -2 -3  4  0 -1 -9;...
  -1 -4  3  5 -7  0  4 -1 -1 -4 -6 -1 -5 -8 -3 -1 -2 -9 -6 -4  4  3 -2 -9;...
  -3 -5 -5 -7  9 -8 -8 -5 -4 -3 -8 -8 -7 -7 -4 -1 -4 -9 -1 -3 -6 -8 -5 -9;...
  -2  1 -1  0 -8  6  2 -3  3 -4 -2  0 -2 -7 -1 -2 -2 -7 -6 -3  0  5 -2 -9;...
   0 -3  1  4 -8  2  5 -1 -1 -3 -5 -1 -4 -8 -2 -1 -2 -9 -5 -3  3  4 -2 -9;...
   1 -5 -1 -1 -5 -3 -1  5 -4 -5 -6 -3 -4 -6 -2  0 -2 -9 -7 -3 -1 -2 -2 -9;...
  -3  1  2 -1 -4  3 -1 -4  7 -4 -3 -2 -4 -3 -1 -2 -3 -4 -1 -3  1  1 -2 -9;...
  -2 -3 -3 -4 -3 -4 -3 -5 -4  6  1 -3  1  0 -4 -3  0 -7 -3  3 -3 -3 -2 -9;...
  -3 -5 -4 -6 -8 -2 -5 -6 -3  1  6 -4  3  0 -4 -4 -3 -3 -3  0 -5 -4 -3 -9;...
  -3  2  1 -1 -8  0 -1 -3 -2 -3 -4  5  0 -7 -3 -1 -1 -6 -6 -4  0 -1 -2 -9;...
  -2 -1 -4 -5 -7 -2 -4 -4 -4  1  3  0  9 -1 -4 -3 -1 -6 -5  1 -4 -2 -2 -9;...
  -5 -6 -5 -8 -7 -7 -8 -6 -3  0  0 -7 -1  8 -6 -4 -5 -1  4 -3 -6 -7 -4 -9;...
   1 -1 -2 -3 -4 -1 -2 -2 -1 -4 -4 -3 -4 -6  7  0 -1 -7 -7 -3 -3 -1 -2 -9;...
   1 -1  1 -1 -1 -2 -1  0 -2 -3 -4 -1 -3 -4  0  4  2 -3 -4 -2  0 -2 -1 -9;...
   1 -3  0 -2 -4 -2 -2 -2 -3  0 -3 -1 -1 -5 -1  2  5 -7 -4  0 -1 -2 -1 -9;...
  -7  1 -5 -9 -9 -7 -9 -9 -4 -7 -3 -6 -6 -1 -7 -3 -7 12 -2 -9 -6 -8 -6 -9;...
  -4 -6 -2 -6 -1 -6 -5 -7 -1 -3 -3 -6 -5  4 -7 -4 -4 -2  9 -4 -4 -6 -4 -9;...
   0 -4 -3 -4 -3 -3 -3 -3 -3  3  0 -4  1 -3 -3 -2  0 -9 -4  5 -4 -3 -2 -9;...
  -1 -3  4  4 -6  0  3 -1  1 -3 -5  0 -4 -6 -3  0 -1 -6 -4 -4  4  2 -2 -9;...
  -1 -1  0  3 -8  5  4 -2  1 -3 -4 -1 -2 -7 -1 -2 -2 -8 -6 -3  2  5 -2 -9;...
  -1 -2 -1 -2 -5 -2 -2 -2 -2 -2 -3 -2 -2 -4 -2 -1 -1 -6 -4 -2 -2 -2 -2 -9;...
  -9 -9 -9 -9 -9 -9 -9 -9 -9 -9 -9 -9 -9 -9 -9 -9 -9 -9 -9 -9 -9 -9 -9  1;...
    ];

if nargout >1
    matrixInfo.Name = 'PAM100';
    matrixInfo.Scale = 1/2;
    matrixInfo.Entropy = 1.18 ;
    matrixInfo.ExpectedScore = -1.99;
    matrixInfo.LowestScore = -9;
    matrixInfo.HighestScore = 12;
    matrixInfo.Order = 'ARNDCQEGHILKMFPSTWYVBZX*';
end