if ( c == FuncColumn && v < funcMinimum( r ) )
v = funcMinimum( r ); // correct func value according to the valid min value
if ( c == FuncColumn && v < funcMinimum( r ) )
v = funcMinimum( r ); // correct func value according to the valid min value
v = funcMaximum( r ); // correct func value according to the valid max value
else if ( r == ArgColumn && v < argMinimum( r ) )
v = argMinimum( r ); // correct arg value according to the valid min value
v = funcMaximum( r ); // correct func value according to the valid max value
else if ( r == ArgColumn && v < argMinimum( r ) )
v = argMinimum( r ); // correct arg value according to the valid min value