function [matrix, matrixInfo] = pam260
%PAM260 substitution matrix in 1/3 bit units,
%   Expected score = -0.794, Entropy = 0.330 bits
%   Lowest score = -7, Highest score = 17
%
%   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] = PAM260 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: 1.5 $ 

matrix = [...
   2 -1  0  0 -2  0  0  1 -1  0 -2 -1 -1 -3  1  1  1 -6 -3  0  0  0  0 -7;...
  -1  6  0 -1 -4  1 -1 -2  2 -2 -3  3  0 -4  0  0 -1  2 -4 -2 -1  0 -1 -7;...
   0  0  2  2 -3  1  1  0  2 -2 -3  1 -2 -3  0  1  0 -4 -2 -2  2  1  0 -7;...
   0 -1  2  4 -5  2  3  1  1 -2 -4  0 -2 -5 -1  0  0 -6 -4 -2  3  3 -1 -7;...
  -2 -4 -3 -5 12 -5 -5 -3 -3 -2 -6 -5 -5 -4 -3  0 -2 -7  0 -2 -4 -5 -3 -7;...
   0  1  1  2 -5  4  2 -1  3 -2 -2  1 -1 -4  0  0 -1 -5 -4 -2  1  3  0 -7;...
   0 -1  1  3 -5  2  4  0  1 -2 -3  0 -2 -5  0  0  0 -7 -4 -2  3  3 -1 -7;...
   1 -2  0  1 -3 -1  0  5 -2 -2 -4 -2 -3 -5  0  1  0 -7 -5 -1  1  0 -1 -7;...
  -1  2  2  1 -3  3  1 -2  6 -2 -2  0 -2 -2  0 -1 -1 -3  0 -2  1  2 -1 -7;...
   0 -2 -2 -2 -2 -2 -2 -2 -2  4  2 -2  2  1 -2 -1  0 -5 -1  4 -2 -2 -1 -7;...
  -2 -3 -3 -4 -6 -2 -3 -4 -2  2  6 -3  4  2 -2 -3 -2 -2 -1  2 -3 -2 -1 -7;...
  -1  3  1  0 -5  1  0 -2  0 -2 -3  4  0 -5 -1  0  0 -3 -4 -2  1  0 -1 -7;...
  -1  0 -2 -2 -5 -1 -2 -3 -2  2  4  0  6  0 -2 -1 -1 -4 -2  2 -2 -2 -1 -7;...
  -3 -4 -3 -5 -4 -4 -5 -5 -2  1  2 -5  0  9 -4 -3 -3  0  7 -1 -4 -5 -2 -7;...
   1  0  0 -1 -3  0  0  0  0 -2 -2 -1 -2 -4  6  1  0 -5 -5 -1 -1  0 -1 -7;...
   1  0  1  0  0  0  0  1 -1 -1 -3  0 -1 -3  1  1  1 -2 -3 -1  0  0  0 -7;...
   1 -1  0  0 -2 -1  0  0 -1  0 -2  0 -1 -3  0  1  2 -5 -3  0  0  0  0 -7;...
  -6  2 -4 -6 -7 -5 -7 -7 -3 -5 -2 -3 -4  0 -5 -2 -5 17  0 -6 -5 -6 -4 -7;...
  -3 -4 -2 -4  0 -4 -4 -5  0 -1 -1 -4 -2  7 -5 -3 -3  0 10 -2 -3 -4 -2 -7;...
   0 -2 -2 -2 -2 -2 -2 -1 -2  4  2 -2  2 -1 -1 -1  0 -6 -2  4 -2 -2 -1 -7;...
   0 -1  2  3 -4  1  3  1  1 -2 -3  1 -2 -4 -1  0  0 -5 -3 -2  3  2  0 -7;...
   0  0  1  3 -5  3  3  0  2 -2 -2  0 -2 -5  0  0  0 -6 -4 -2  2  3 -1 -7;...
   0 -1  0 -1 -3  0 -1 -1 -1 -1 -1 -1 -1 -2 -1  0  0 -4 -2 -1  0 -1 -1 -7;...
  -7 -7 -7 -7 -7 -7 -7 -7 -7 -7 -7 -7 -7 -7 -7 -7 -7 -7 -7 -7 -7 -7 -7  1;...
    ];

if nargout >1
    matrixInfo.Name = 'PAM260';
    matrixInfo.Scale = 1/3;
    matrixInfo.Entropy = 0.330 ;
    matrixInfo.ExpectedScore = -0.794;
    matrixInfo.LowestScore = -7;
    matrixInfo.HighestScore = 17;
    matrixInfo.Order = 'ARNDCQEGHILKMFPSTWYVBZX*';
end