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# CALC 1 Exponential Curve Fitting Calculator

## This calculator focuses on calculations for exponential curve fitting.

y = b * exp(m * x)

is used to append the x and y reg values to the x and y lists.

For y=54 and x=4:

54

4

All values for y must be greater than 0.

See the Exponential Curve Fitting Examples for additional information on this calculator.

Using the "long press" gesture will display a hint about any key. (Video: Displaying a hint) You can inspect the Key Details to see the formulas and functions for any key.

The List Manager is used to inspect and edit the lists.

LabelDescription
y estExtrapolates a value for y for the given x based on existing values in the x, y lists.
crrlCalculates the correlation coefficient between lists x, y using ln(y).
m fctCalculates the M factor of the exponential regression for the lists.
b fctCalculates the B factor of the exponential regression for the lists.
Σ+Append x and y to lists x, y.
Calculates the square root of x.
y^xCalculates y raised to power of x.
1/xCalculates the reciprocal of x.
SWAPSwaps the x and y registers.
÷Divides y by x.
ROLLRolls the stack down.
×Multiplies y times x.
Subtracts x from y.
%Calculates the x percent of y.

Label Description
x est Extrapolates a value for x for the given y based on existing values in the x, y lists.
Σx,y Calculates the sum of lists x, y.
N Calculates the count of lists x, y.
min Calculates the minimum value of lists x, y.
max Calculates the maximum value of lists x, y.
last x Recalls the 'last x' value.
clr m Clears all of the user memory.
clr s Clears the stack registers (x, y, z, t).
clr l Clears the x and y lists.
Δ% Calculates the percent change from y to x.