I have a set of data and I have tried to create a line of best fit of the function a(1-exp(b*x)) xx := [180, 120, 30, 340, 215, 285, 175, 36, 420, 77]; yy := [10724.5, 6163.1, 2509.1, 26308.8, 5669.8, 19183.5, 23020.2, 2570, 16199.4, 9013.2]; I tried to use the "nonlinearfit" function but so far it comes up with an equation which does not fit into the scatter graph which I have also created with the data. Is there any other way to do this? Thanks