I have an two arrays: For instance one with values for frequency the other with voltages, I want to compare a certain frequency and its voltage to another frequency and its voltage? Say 500 Hz has 20v and 1000Hz has 10v, I want to compare those two points and came up with a string that will display something like good data or bad data ?How can I do that, been searching for a week cant find it. Another is how can I interpolate for example to find the frequency which has a value of 7v and then display it. Please Help