Changeset 1221196 in sasview
 Timestamp:
 Jan 27, 2017 3:58:23 PM (6 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, release4.1.1, release4.1.2, release4.2.2, ticket1009, ticket1094headless, ticket12422dresolution, ticket1243, ticket1249, ticket885, unittestsaveload
 Children:
 b61bd57
 Parents:
 51f1c347
 File:

 1 edited
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src/sas/sasgui/perspectives/pr/media/pr_help.rst
r0391dae r1221196 10 10  11 11 12 This tool calculates a realspace distance distribution function, *P(r)*, using 13 the inversion approach (Moore, 19 08).12 This tool calculates a realspace distance distribution function, *P(r)*, using 13 the inversion approach (Moore, 1980). 14 14 15 15 *P(r)* is set to be equal to an expansion of base functions of the type … … 24 24 25 25 \chi^2=\frac{\sum_i (I_{meas}(Q_i)I_{th}(Q_i))^2}{error^2}+Reg\_term 26 26 27 27 28 28 where $I_{meas}(Q_i)$ is the measured scattering intensity and $I_{th}(Q_i)$ is 29 the prediction from the Fourier transform of the *P(r)* expansion. 29 the prediction from the Fourier transform of the *P(r)* expansion. 30 30 31 The $Reg\_term$ term is a regularization term set to the second derivative 31 The $Reg\_term$ term is a regularization term set to the second derivative 32 32 $d^2P(r)/d^2r$ integrated over $r$. It is used to produce a smooth *P(r)* output. 33 33 … … 40 40 41 41 * *Number of terms*: the number of base functions in the P(r) expansion. 42 42 43 43 * *Regularization constant*: a multiplicative constant to set the size of 44 44 the regularization term.
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