# Changeset 0390040 in sasview

Ignore:
Timestamp:
Jul 12, 2016 6:50:09 AM (7 years ago)
Branches:
master, ESS_GUI, ESS_GUI_Docs, ESS_GUI_batch_fitting, ESS_GUI_bumps_abstraction, ESS_GUI_iss1116, ESS_GUI_iss879, ESS_GUI_iss959, ESS_GUI_opencl, ESS_GUI_ordering, ESS_GUI_sync_sascalc, costrafo411, magnetic_scatt, release-4.1.1, release-4.1.2, release-4.2.2, ticket-1009, ticket-1094-headless, ticket-1242-2d-resolution, ticket-1243, ticket-1249, ticket885, unittest-saveload
Children:
2fe78566
Parents:
8bdc103
Message:

Add tutorial to corfunc perspective help

Files:
2 edited

### Legend:

Unmodified
 r41345d7e If Fourier is selected for the transform type, the perspective will perform a discrete cosine transform to the extrapolated data in order to calculate the discrete cosine transform on the extrapolated data in order to calculate the correlation function. The following algoritm is applied: ^^^^^^^ If Hilbert is selected for the transform type, the perspective will perform a Hilbert transform to the extraplated data in order to calculate the Volume Hilbert transform on the extraplated data in order to calculate the Volume Fraction Profile. *   Polydispersity :math:= \Gamma_{\text{min}}/\Gamma_{\text{max}} *   Local Crystallinity :math:= L_c/L_p .. ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ Usage ----- Upon sending data to the correlation function perspective, it will plot the data , as well as a red bar indicating the lower Q range (used for back-extrapolation), and 2 purple bars indicating the upper qrange (used for forwards-extraplation) [figure 3]. These bars may be moved my clicking and dragging, or by entering the appropriate value in the Q range input boxes. .. figure:: tutorial1.png :align: center **Figure 3** A plot of some data showing the Q range bars Once the Q ranges have been set, click the "Calculate" button next to the background input field to calculate the Bonart thermal background level. Alternatively, enter your own value into the field. Click the "Extrapolate" button to extrapolate the data and plot the extrapolation in the same figure as the original data. [figure 4] .. figure:: tutorial2.png :align: center **Figure 4** A plot showing the extrapolated data and the original data Then, select which type of transform you would like to perform, using the radio buttons: *   **Fourier** Perform a Fourier Transform to calculate the correlation function of the extrapolated data *   **Hilbert** Perform a Hilbert Transform to calculate the volume fraction profile of the extrapolated data Clicking the transform button will then perform the selected transform and plot it in a new figure. If a Fourier Transform was performed, the "Compute Parameters" button can also be clicked to calculate values for the output parameters [figure 5] .. figure:: tutorial3.png :align: center **Figure 5** The Fourier Transform (correlation function) of the extrapolated data, and the parameters extracted from it.