{

std::vector<double> result;

std::stringstream stream(radiusList);

bool addN = false;

while(stream.good())

{

std::string value;

getline(stream, value, ',');

if ( value == "n" || value == "N")

{

addN = true;

}

else

{

char *end;

long int val = std::strtol(value.c_str(), &end, 10 );

if (val == 0 )

{

std::stringstream message;

message << "Found either 0 or unparsable radius " << value << std::flush;

throw CommandLineException(message.str());

}

if (val < 0)

{

throw CommandLineException("Radius must be either n or a positive integer");

}

if (strlen(end) > 0)

{

std::stringstream message;

message << "Found non integer radius " << value << std::flush;

throw CommandLineException(message.str());

}

result.push_back((double)val);

}

}

std::sort(result.begin(), result.end());

if (result.empty() || addN)

{

result.push_back(-1.0);

}

return result;