Title |
Defines the name of the Fourier spectrum. |
From |
Defines the lower bound of the frequency range to be calculated. |
To |
Defines the upper bound of the frequency range. |
Step rate |
Defines the accuracy of the frequency grid for the Fourier
calculation. Three default options for the step rate quality are available
and can be selected by the combo box: High,
Medium and Low. In order to set a
user defined value select Custom and type the value into the text
field next to the step rate combobox. Please note: The smaller the step
rate the longer the calculation will take. |
Nyquist |
Displays the Nyquist frequency for the current selection of time
points. This value should be a good estimate for the upper limiting
frequency due to the sampling pattern in the time string that is currently
selected. The algorithm estimates the average time gap between neighboring
points while ignoring large gaps. |
Use weights |
Displays a string that indicates which weights are being used for the
Fourier calculation. If no weights are used "none" will be displayed.
1 |
use the weights assigned to the substrings of attribute #1 |
2 | use the weights assigned to the
substrings of attribute #2 |
3 | use the weights assigned to the
substrings of attribute #3 |
4 | use the weights assigned to the
substrings of attribute #4 |
p | use point weight |
d | use deviation weight |
|
Edit weight settings |
Opens the weight-selection dialog. |
Calculations based on |
Defines the type of data to be used for the calculation.
Original data, Adjusted data, Residuals at original,
Residuals at adjusted. If Spectral window is chosen the
program will calculate the spectral window which is centered at zero
frequency and reflects the pattern caused by the structure of gaps in the
time string.
|
Compact mode |
The output of the Fourier calculation can be quite extensive. To reduce
the output Peaks only can be selected. In this case only local maxima
and minima are saved. If All is selected, all data points of the
spectrum are stored. |
To start the calculation based on the settings in the Fourier folder either press the button