# Logarithmic calibration

1. Sep 21, 2005

### macilak

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.

Are you constrained to solving the problem by iteration? You could just write $x=2^y$ and use the built-in functions.