and selecting Manual.Using Logger Pro, you can apply curve fits or mathematical models to data. There are two ways in which to apply a curve fit: automatic and manual. You can also plot a function on a graph without data. See below for more information.
The type of curve fit you choose depends on whether you want Logger Pro to find a best fit curve (Automatic) or if you want to determine the coefficients on your own (Manual).
When applying an automatic curve fit, Logger Pro calculates the best values for the coefficients to fit the curve to the data using a least-squares approach. If Logger Pro is having a difficult time fitting the data, you can enter some known starting values for the coefficients, or you can click Try Fit more than once. Each time you click Try Fit, the algorithm starts from the current values of the coefficients and iterates closer to a solution. Note: If you enter coefficient values directly, the curve fit type switches to Manual.
When applying a manual curve fit or model, you are able to enter each of the coefficient values and Logger Pro does not do any automatic fitting. Use the manual curve fit or model option if you want your students to explore coefficients and curve fitting on their own.
You don't need data if you simply want to see a function plotted alone on a graph. You can graph an equation on a blank graph by choosing Model from the Analyze menu and selecting the function you want graphed. Select OK to display the function on your graph. Note: You can also graph a function on a blank graph by clicking the Curve Fit button and selecting Manual.