# Changeset 490f790 in sasview

Ignore:
Timestamp:
Sep 28, 2018 7:20:48 AM (5 months ago)
Branches:
master, Prep4Release4_2_1, py37-all, py37-sascalc, py37-sasgui, pytest, setup_clean_up, simplify-c-build, ticket-1094-headless, ticket-1205-fit-weights, ticket-1220, unittest-saveload
Children:
2ae8579
Parents:
acdf0d1
Message:

Tweaks to corfunc_help.rst

File:
1 edited

### Legend:

Unmodified
 r501712f Both analyses are performed in 3 stages: *  Extrapolation of the scattering curve to :math:Q = 0 and toward :math:Q = \infty *  Extrapolation of the scattering curve to :math:q = 0 and toward :math:q = \infty *  Smoothed merging of the two extrapolations into the original data *  Fourier / Hilbert Transform of the smoothed data to give the correlation ------------- To :math:Q = 0 To :math:q = 0 ................ the impact on any extrapolated parameters will be least significant. To :math:Q = \infty To :math:q = \infty ..................... - do they smoothly curve onto the ordinate at x = 0? (if not check the value of :math:\sigma is sensible) - are there ripples at x values corresponding to (2 :math:pi over) the two - are there ripples at x values corresponding to (2 :math:\pi over) the two q values at which the extrapolated and experimental data are merged? - are there any artefacts at x values corresponding to 2 :math:pi / q\ :sub:max in - are there any artefacts at x values corresponding to 2 :math:\pi / q\ :sub:max in the experimental data? - and lastly, do the significant features/peaks in the correlation functions -q^{4} I(q) The IDF is proportional to the second derivative of Î\ :sub:1\ (x). The IDF is proportional to the second derivative of Î\ :sub:1\ (x) and represents a superposition of thickness distributions from all the contributing lamellae. Hilbert *   Local Crystallinity :math:= L_c/L_p .. warning:: If the sample does not possess lamellar morphology then "Compute Parameters" will return garbage! Volume Fraction Profile ....................... The reader is directed to the references for information on these parameters. References Once the Q ranges have been set, click the "Calculate Bg" button to determine the background level. Alternatively, enter your own value into the box. If the box turns yellow this indicates that background subtraction has created some negative intensities. yellow this indicates that background subtraction has created some negative intensities. This may still be fine provided the peak intensity is very much greater than the background level. The important point is that the extrapolated dataset must approach zero at high-q. Now click the "Extrapolate" button to extrapolate the data. The graph window will update .. note:: This help document was last changed by Steve King, 26Sep2017 This help document was last changed by Steve King, 28Sep2017