The Main tab
In the upper part of the 'Main' folder buttons for loading or saving frequencies
are situated. If the frequencies are imported from an external file, the file to be imported has to be formatted as shown below:
F1 8.24559279926746 0.0368726838369623 0.191925673969421
F2 8.86632000196593 0.0315951342401606 0.201285085238147
F3 (8.51414241709122 0.00995255120153335 0.811823263345419 )
If the frequency parameters are enclosed by parentheses, the frequency will
appear inactive in the frequency list.
Furthermore, some information regarding the current fit is given:
Selected frequencies |
The total number of active frequencies. A frequency is
active (and will be included into calculations) when the respective check
box is selected in the frequency list.
|
Zero point |
The zero point of the magnitudes/intensities resulting from the last calculated fit. |
Residuals |
The residuals (chi) for the last calculated fit. |
To the left of the import/export buttons and to the right of the information
labels there is a toggle button, respectively.
A click on the left hand side toggle button detaches the 'Time string' tab from
the main frame and places the 'Time string' panel left of the main frame,
whereas a click on the right hand side toggle button causes the 'Fourier' tab to
be detached and placed to the right of the main frame.
If your screen is wide
enough this makes it possible to use Period04 without having to switch between
the different tabs.
Settings for least-squares fit calculations
Fitting formula |
Displays the formula that is being used for least-squares fits. |
Calculations based on |
This defines the type of data to be used for the next least-squares calculation. |
Use weights |
Displays a string that indicates which weights are being used for the
least-squares 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. |
The frequency list
In the default mode the frequency list consists of text fields for frequency,
amplitude and phase values and corresponding check boxes. If a check box is
selected then the respective non-zero frequency will be included in the next least-squares calculation.
Input options for frequency fields:
It is possible to enter
harmonics or
frequency combinations into
frequency fields as shown in the examples below:
=2f1 or =2*f1 | for the second harmonic of f1. |
=f1+f3 | for a combination frequency which is defined as the sum
of f1 and f3. |
=2f1-3f4 or = 2*f1-3*f4 | for a combination frequency which
is defined as the difference of the second harmonic of f1 and the third
harmonic of f4. |
Please note:
A reference to a frequency that is a combination itself, will be rejected by
the program. If one of the frequencies listed in the combination is not
active, the combination is not active either
If a frequency is a combination a little button showing the letter "C"
will appear between the frequency check-box and the frequency text field. Click
on this button to show the frequency value instead of the combination string
and vice versa.
Note: Special behavior in Period04 version 1.0.2 and higher!
It now makes a difference for your compuations if you decide to display the frequency value or the combination string. If the combination string is shown the program acts just as it used to before, but if the frequency value is displayed Period04 will treat this frequency as a normal frequency.
Adding or subtracting the
alias gap value:
In order to add the alias-gap value to the frequency value, enter a trailing
'+'. Type '-' if you want to subtract the alias-gap value. Multiple '+' or '-'
can also be used, e.g., '34.11+++' means 34.11 with three times the alias-gap
value added. The default value for the alias-gap can be set by using the
'Set alias-gap dialog' in the
Data Manager.