function [matrix, matrixInfo] = pam270
%PAM270 substitution matrix in 1/4 bit units,
%   Expected score = -0.969, Entropy = 0.309 bits
%   Lowest score = -10, Highest score = 23
%
%   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] = PAM270 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  -2   0   0  -2   0   0   2  -2  -1  -2  -1  -1  -4   1   1   1  -7  -4   0   0   0   0 -10;...
   -2   8   0  -1  -5   2  -1  -3   2  -2  -4   4  -1  -5   0   0  -1   3  -5  -3  -1   0  -1 -10;...
    0   0   2   2  -4   1   2   1   2  -2  -3   1  -2  -4   0   1   1  -5  -3  -2   2   2   0 -10;...
    0  -1   2   5  -6   2   4   1   1  -3  -5   0  -3  -7  -1   0   0  -8  -5  -3   4   3  -1 -10;...
   -2  -5  -4  -6  16  -7  -6  -4  -4  -3  -7  -7  -6  -5  -3   0  -3 -10   1  -2  -5  -7  -4 -10;...
    0   2   1   2  -7   5   3  -1   4  -2  -2   1  -1  -6   0  -1  -1  -6  -5  -2   2   4  -1 -10;...
    0  -1   2   4  -6   3   5   0   1  -2  -4   0  -3  -7  -1   0   0  -9  -5  -2   3   4  -1 -10;...
    2  -3   1   1  -4  -1   0   6  -2  -3  -5  -2  -3  -6   0   1   0  -9  -6  -2   1   0  -1 -10;...
   -2   2   2   1  -4   4   1  -2   8  -3  -3   0  -3  -2   0  -1  -1  -3   0  -3   1   2  -1 -10;...
   -1  -2  -2  -3  -3  -2  -2  -3  -3   5   3  -2   3   1  -2  -2   0  -6  -1   5  -3  -2  -1 -10;...
   -2  -4  -3  -5  -7  -2  -4  -5  -3   3   8  -3   5   2  -3  -3  -2  -2  -1   2  -4  -3  -2 -10;...
   -1   4   1   0  -7   1   0  -2   0  -2  -3   6   0  -6  -1   0   0  -4  -5  -3   1   0  -1 -10;...
   -1  -1  -2  -3  -6  -1  -3  -3  -3   3   5   0   8   0  -2  -2  -1  -5  -3   2  -3  -2  -1 -10;...
   -4  -5  -4  -7  -5  -6  -7  -6  -2   1   2  -6   0  12  -6  -4  -4   1   9  -1  -6  -6  -3 -10;...
    1   0   0  -1  -3   0  -1   0   0  -2  -3  -1  -2  -6   7   1   0  -7  -6  -1  -1   0  -1 -10;...
    1   0   1   0   0  -1   0   1  -1  -2  -3   0  -2  -4   1   2   2  -3  -4  -1   1   0   0 -10;...
    1  -1   1   0  -3  -1   0   0  -1   0  -2   0  -1  -4   0   2   3  -6  -3   0   0  -1   0 -10;...
   -7   3  -5  -8 -10  -6  -9  -9  -3  -6  -2  -4  -5   1  -7  -3  -6  23   0  -8  -7  -7  -5 -10;...
   -4  -5  -3  -5   1  -5  -5  -6   0  -1  -1  -5  -3   9  -6  -4  -3   0  13  -3  -4  -5  -3 -10;...
    0  -3  -2  -3  -2  -2  -2  -2  -3   5   2  -3   2  -1  -1  -1   0  -8  -3   5  -2  -2  -1 -10;...
    0  -1   2   4  -5   2   3   1   1  -3  -4   1  -3  -6  -1   1   0  -7  -4  -2   3   3  -1 -10;...
    0   0   2   3  -7   4   4   0   2  -2  -3   0  -2  -6   0   0  -1  -7  -5  -2   3   4  -1 -10;...
    0  -1   0  -1  -4  -1  -1  -1  -1  -1  -2  -1  -1  -3  -1   0   0  -5  -3  -1  -1  -1  -1 -10;...
  -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10   1;...
    ];

if nargout >1
    matrixInfo.Name = 'PAM270';
    matrixInfo.Scale = 1/4;
    matrixInfo.Entropy = 0.309 ;
    matrixInfo.ExpectedScore = -0.969;
    matrixInfo.LowestScore = -10;
    matrixInfo.HighestScore = 23;
    matrixInfo.Order = 'ARNDCQEGHILKMFPSTWYVBZX*';
end