%  判断并修改B的第5列
index = b( :, 5 ) < 0.7;
b( index, 5 ) = a( index ) / 4 + 0.525;
index = b( :, 5 ) > 1.6;
b( index, 5 ) = a( index ) / 4 + 1.2;

%  判断并修改B的第5列
index = b( :, 5 ) < 0.7;
b( index, 5 ) = a( index, 5 ) / 4 + 0.525;
index = b( :, 5 ) > 1.6;
b( index, 5 ) = a( index, 5 ) / 4 + 1.2;

%  输出B
fprintf( fp, '%20.2f   %20.2f   %20.2f   %20.4f   %20.4f \n', b' );