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# CALC 1 Function Calculators General Help

The CALC 1 Function Calculators are dedicated to a single function with store, recall and solve keys for each parameter as well as the result. You can also easily create a graph of the function by entering the range and selecting the independent variable.

Function calculators also provide a convenient way to use functions that have more than a few parameters. The Normal Distribution functions calculators are example of this case.

When there are more than 4 parameters a second row will appear.

CALC 1 comes with many Function Calculators and more can be easily downloaded.

## Using a Function Calculator

For each function calculator, you key in values, tap the corresponding key to store the value and then calculate the function when you tap the left most key in the top row.

The Fuel Savings Calculator has an example of calculating breakeven values using the solving.

## History

All Function Calculator calculations are stored in History. From the History Details, you can verify and share the results. You can also restore past results to a Function Calculator from history.

## Solving

With solving, CALC 1 starts with the initial value of the parameter, the "initial guess". The solver then calculates the function using the initial guess and compares it to the target. The solver then determines if it should increase or decrease the initial guess to find the value that will give you the target value.

In the 2nd Degree Polynomial example, there are 2 values for X that will result in Fx=0. Which root that is calculated depends on the initial guess you provide to the solver.

When you attempt to solve for an independent variable and get an error message, means that the solver was not able to find two values for the independent variable that resulted in a value greater than and less than the target. Check and make sure that what you are solving for is possible. In the Cumulative Distribution Function for 2 Values example 2, if you tried to find a value for x2 that resulted in a cdf of .99, you would get this error. That is because, given the value of x1, it is not possible to have a value for x2 that has a cdf of .99.

Often, changing your initial guess will help find a solution.

In all of our examples we begin by calculating the dependent variable. Then small changes in the dependent variable will usually give you the answer you are looking for for the independent variable.

In general, CALC 1, like most calculators that solves for roots will work best with continuous functions.

## Graphing

CALC 1 will create a graph of any Function Calculator.

Just enter the minimum and maximum value for the independent variable, tap shift and select the independent variable.

The Polynomial 3 Formula Calculator has a graphing example.