exp_decay

exp_decay(x, y)

Get exponential decay parameter from monotonically increasing (decreasing) curve.

This assumes following function form.

$$y(x)=e^{\alpha x}$$

We can calculate $\alpha$ as

$$\alpha =\log (y(x))/x$$

To find this number, the numpy polynomial fit with deg=1 is used.

Parameters:

• x (ndarray) – Array of x values.

• y (ndarray) – Array of y values.

Returns:

Decay rate of signal.

Return type:

float