Long ago I wrote several misc. Math Helper functions. I put the ones I used most often in a small library so other people can use them too.
Most important function is char * sci( float f, int digits); which represents a float in scientific format. Currently Serial.println(f) gives an overflow if abs(f) > MAXLONG or so. The function dtostrf() does not overflow but give ridiculous long strings.
small example, energy of a mass of 75 Kg
float c = 2.99792458E8; // speed of light; float m = 7.5E5; // 75 Kg float E = m * c * c; // According to Einstein Serial.println(sci(E, 4)); // prints 6.7407E+22
Code can be found on Github
As allways comments, remarks, improvements or examples are welcome