Add a model here when you are working on it. Mark it as converted when it is tested and pushed.

The err columns are the result of running multi_compare.sh, which generates random parameters for comparison against sasview. double should be at most 5e-14 relative error, single should be 5e-5.

./multi_compare.sh MODEL 200 1d200 mono double
./multi_compare.sh MODEL 200 1d200 mono single
./multi_compare.sh MODEL 200 2d32 mono double
./multi_compare.sh MODEL 200 2d32 mono single

Some models still have issues when run using single precision (lamellarPC for example).

We are not dealing with magnetism at this point as it requires some work on the wrapper functionality. Thus the *Magnetic* column below is for reference as to which models need attention. The *SESANS* column should be used to indicate if the model is a priority (1 highest, 4 lowest). The Multiply column indicates whether the model can be multiplied by a structure factor. This is currently hardcoded into src/sas/perspectives/fitting/models.py

SasView name	sasmodels name	P(Q)	S(Q)	Multiply	Multiplicity	Magnetic	SESANS	Assigned	Converted	UTest	double err	single err	double 2D	single 2D
Core2ndMomentModel	adsorbed_layer	Y	.	.	.	.	3	SMK	Y	-	good	good	-	-
BarBellModel	barbell	Y	.	.	.	.	3	AJJ	Y	-	good	good	FAIL	FAIL
BCCrystalModel	bcc	Y	.	.	.	.	3	AJJ	Y	-	good	FAIL	9e-14	2e-2
BEPolyelectrolyte	be_polyelectrolyte	Y	.	.	.	.	3	PR	Y	Y	good	good	-	-
BinaryHSModel	binary_hard_sphere	Y	N	N	N	N	1	PDB	Y	Y	FAIL	OK	-	-
BroadPeakModel	broad_peak	Y	.	.	.	.	4	PDB	Y	-	good	good	-	-
CappedCylinderModel	capped_cylinder	Y	.	.	.	.	3	HP	Y	-	good	good	2e-11	3e-3
CoreShellBicelleModel	core_shell_bicelle	Y	.	Y	.	.	2	PR	Y	Y	good	good	1e-12	1e-4
CoreShellCylinderModel	core_shell_cylinder	Y	.	Y	.	.	3	HP	Y	-	good	good	9e-14	4e-4
CoreShellEllipsoidModel	core_shell_ellipsoid	Y	.	Y	.	.	3	PR	Y	Y	good	1e-4	good	1e-3
CoreShellEllipsoidXTModel	core_shell_ellipsoid_xt	Y	.	Y	.	.	3	PR	Y	Y	good	1e-4	good	1e-3
CoreShellModel	core_shell_sphere	Y	.	Y	.	Y	2	MD	Y	Y	good	good	-	-
CorrLength	correlation_length	Y	.	.	.	.	3	JRK	Y	Y	good	good	-	-
CSParallelepipedModel	core_shell_parallelepiped	Y	.	Y	.	.	3	MAG	Y	Y	good	good	5e-13	8e-4
CylinderModel	cylinder	Y	.	Y	.	Y	1	HP	Y	-	good	good	2e-13	1e-4
DABModel	dab	Y	.	.	.	.	1	DM	Y	-	good	good	-	-
EllipsoidModel	ellipsoid	Y	.	Y	.	.	1	HP	Y	-	good*	good	3e-14	1e-4
EllipticalCylinderModel	elliptical_cylinder	Y	.	Y	.	.	3	MD	Y	Y	good	good	-	-
FCCrystalModel	fcc	Y	.	.	.	.	3	AJJ	Y	-	good	FAIL	FAIL	FAIL
FlexibleCylinderModel	flexible_cylinder	Y	.	.	.	.	2	PR	Y	Y	good	FAIL	-	-
FlexCylEllipXModel	flexible_cylinder_ex	Y	.	.	.	.	3	PR	Y	Y	good	FAIL	-	-
FractalModel	fractal	Y	.	.	.	.	1	PDB	Y	Y	good*	good*	-	-
FractalCoreShell	fractal_core_shell	Y	.	.	.	.	3	PR	Y	Y	good	good	-	-
FuzzySphereModel	fuzzy_sphere	Y	.	Y	.	.	2	TRN	Y	Y	good*	good	-	-
PeakGaussModel	gaussian_peak	Y	.	.	.	.	4	AJJ	Y	-	good	1e-3	-	-
GaussLorentzGel	gauss_lorentz_gel	Y	.	.	.	.	2	PR	Y	Y	good	good	-	-
GelFitModel	gel_fit	Y	.	.	.	.	1	PR	Y	Y	good	good	-	-
Guinier	guinier	Y	.	.	.	.	1	JRK	Y	Y	good	good	-	-
GuinierPorod	guinier_porod	Y	.	.	.	.	2	MD	Y	Y	good	good	-	-
HardsphereStructure	hardsphere	.	Y	.	.	.	1	RKH	Y	Y	good	FAIL	-	-
HayterMSAStructure	hayter_msa	.	Y	.	.	.	1	RKH	Y	Y	OK	FAIL	-	-
HollowCylinderModel	hollow_cylinder	Y	.	Y	.	.	2	JRK	Y	Y	good	good	4e-13	2e-3
LamellarModel	lamellar	Y	.	.	.	.	2	PAK	Y	Y	good	good	-	-
LamellarPSModel	lamellarCaille	Y	.	.	.	.	3	RKH	Y	Y	good	5e-2	-	-
LamellarPSHGModel	lamellarCailleHG	Y	.	.	.	.	3	RKH	Y	Y	3e-12	5e-3	-	-
LamellarFFHGModel	lamellarFFHG	Y	.	.	.	.	3	RKH	Y	Y	good	good	-	-
LamellarPCrystallModel	lamellarPC	Y	.	.	.	.	3	RKH	Y	Y	good	FAIL	-	-
LineModel	line	Y	.	.	.	.	4	WP	Y	Y	good	good	-	-
LinearPearlsModel	linear_pearls	Y	.	.	.	.	3	PR	Y	N	good	fail	-	-
Lorentz	lorentz	Y	.	.	.	.	1	JRK	Y	Y	good	good	-	-
MassFractalModel	mass_fractal	Y	.	.	.	.	1	PR	Y	Y	good	5e-5	-	-
MassSurfaceFractal	mass_surface_fractal	Y	.	.	.	.	1	PR	Y	Y	good	good	-	-
MicelleSphCore	micelle_sphere_core	Y	.	Y	.	.		PR	Y	-	1e-09	FAIL	-	-
sum_p1_p2	mixture	Y	.	.	.	.	3	PAK	Y	-	-	-	-	-
Debye	mono_gauss_coil	Y	.	.	.	.	1	SMK	Y	Y	-	-	-	-
MultiShellModel	multi_shell	Y	.	Y	Y	.	3	PR	Y	Y	2e-09	1e-3	-	-
ParallelepipedModel	parallelepiped	Y	.	Y	.	Y	2	MAG	Y	Y	good	good	5e-13	2e-4
PeakLorentzModel	peak_lorentz	Y	.	.	.	.	4	AJJ	Y	Y	good	good	-	-
PearlNecklaceModel	pearl_necklace	Y	.	.	.	.	3	JRK	Y	Y	6e-14	FAIL	-	-
Poly_GaussCoil	poly_gauss_coil	Y	.	.	.	.	2	SMK	Y	Y	-	-	-	-
PolyExclVolume	polymer_excl_volume	Y	.	.	.	.	3	PR	Y	Y	good	good	-	-
PorodModel	porod	Y	.	.	.	.	3	MD	Y	Y	good	good	-	-
!AbsolutePower_Law	power_law	Y	.	.	.	.	3	SMK	Y	Y	good	good	-	-
MultiplicationModel	product	.	.	.	.	.		PAK	Y	-	-	-	-	-
RaspBerryModel	raspberry	Y	.	.	.	.	2	PDB	Y	Y	good	good	-	-
RectangularPrismModel	rectangular_prism	Y	.	Y	.	.	2	MAG	Y	Y	good	good	-	-
RectangularHollowPrismModel	hollow_rectangular_prism	Y	.	Y	.	.	3	MAG	Y	Y	good	good	-	-
RectangularHollowPrismInfThinWallsModel	hollow_rectangular_prism_infinitely_thin_walls	Y	.	.	.	.	3	MAG	Y	Y	good	good	-	-
SCCrystalModel	sc_crystal	Y	.	.	.	.	3	PR	Y	Y	good	FAIL	good	1e-3
SphereModel	sphere	Y	.	Y	.	Y	1	HP	Y	-	good*	good	-	-
SquareWellStructure	squarewell	.	Y	.	.	.	1	RKH	Y	Y	good	OK	-	-
StackedDisksModel	stacked_disk	Y	.	Y	.	.	2	PR	Y	Y	good	1e-5	good	1e-5
StarPolymer	star_polymer	Y	.	.	.	.	2	PR	Y	Y	good	fail	-	-
StickyHSStructure	stickyhardsphere	.	Y	.	.	.	1	PAK	Y	Y	good	FAIL	-	-
SurfaceFractalModel	surface_fractal	Y	.	.	.	.	1	PR	Y	Y	good	5e-5	-	-
TeubnerStrey	teubner_strey	Y	.	.	.	.	1	PAK	Y	-	good*	good	-	-
TriaxialEllipsoidModel	triaxial_ellipsoid	Y	.	Y	.	.	3	HP	Y	-	good*	good	good	good
TwoLorentzian	two_lorentzian	Y	.	.	.	.	4	PR	Y	Y	good	good	-	-
TwoPowerLaw	two_power_law	Y	.	.	.	.	4	WP	Y	Y	good	good	-	-
VesicleModel	vesicle	Y	.	Y	.	.	2	PDB	Y	Y	good	good*	-	-
CoreMultiShellModel		Y	.	Y	Y	Y	3		.	-	-	-	-	-
OnionExpShellModel		Y	.	Y	Y	.	3	PAK	.	-	-	-	-	-
PringleModel		Y	.	.	.	.	3	WP	.	-	-	-	-	-
ReflectivityModel		Y	.	.	Y	.	4		.	-	-	-	-	-
ReflectivityIIModel		Y	.	.	Y	.	4		.	-	-	-	-	-
RPA10Model		Y	.	.	Y	.	3	PAK	.	-	-	-	-	-
SphericalSLDModel		Y	.	Y	Y	.	3	WP	.	-	-	-	-	-
UnifiedPowerRg		Y	.	.	Y	.	4		.	-	-	-	-	-
sum_Ap1_1_Ap2		Y	.	.	.	.	3		.	-	-	-	-	-
polynomial5		Y	.	.	.	.	3		.	-	-	-	-	-
sph_bessel_jn		Y	.	.	.	.	3		.	-	-	-	-	-
testmodel		Y	.	.	.	.	3		.	-	-	-	-	-
testmodel_2		Y	.	.	.	.	3		.	-	-	-	-	-

^* using taylor expansion near 0 for fq = 3 (sin(qr)/qr - cos(qr))/qr²; using quad precision as a cross check, this is more accurate than computing the direct expression for qr < 0.1 in double precision, and so the values will differ from those in sasview. It is much more accurate in single precision. This affects many models, including sphere and ellipsoid models. The cylinder models are using J1(qr)/qr, which has its own numerical expansion and does not suffer from this problem. Should probably settle on one or the other and move it into the library. So even though the double precision values for sphere, ellipsoid and triaxial ellipsoid differ by more than 5e-14, they are still marked good. Similarly, the Teubner-Strey model checks out against the quad precision version and so is marked good.

some models such as binary hard sphere and raspberry are inherently "unstable" in certain regions of parameter space. They require double precision but the difference between old SasView and sasmodels is still higher than nominally allowed. However hard to say which is more correct at this point.

List of standard parameters has moved to the instructions page