Hello All, I have a very impotant question for you. Any help is appreciated. Given is a logarithmical function: y = log2x (2 is the base) and the y value is known. I have to find out what is the x value in the fewest steps possible. It can be made by giving sample values for x and applying to the function, but the performance (timing) is a key value, so the process must be very quick. The known solution is to split the curve to lines and shrink the range of possibilities. Later on I have to translate the solution into C++ and apply it for calibration. Many thanks in advance for your help!