id summary reporter owner description type status priority milestone component resolution keywords cc workpackage 780 let the user set effective radius in P(Q)*S(Q) pkienzle "`sasmodels.product` defines `P(Q)*S(Q)` using the effective radius from `P(Q)` as the `radius_effective` parameter in `S(Q)`. This is not always correct, and should be under control of the user. Similarly for `volfraction` and `VR`. Instead of hard-coding this relationship, make `ER` and `VR` available as derived parameters from the model. These parameters will only be computed if their value is requested. Models could potentially allow other derived parameters. Use `sasmodels.mixture` to multiply the models. Make sure that it supports arbitrary model expressions, not just A+B. May want to allow model constraints to be set in the model value field. When the radius_effective field is edited, the user will see `=A_ER`, indicating the that the ER() derived parameter from model A should be evaluated. This will save bouncing to a constraints page to indicate a simple constraint." enhancement new major SasView Next Release +1 SasView Beta Approximation Project