code: public static void convert(ComplexPolar_F64 input , Complex_F64 output ) {
          output.real = input.r * Math.cos(input.theta);
          output.imaginary = input.r * Math.sin(input.theta);
      }
docs: <p>
  Converts a complex number in polar notation into standard notation.
  </p>
  
  @param input Standard notation
  @param output Polar notation