Opened 6 years ago

Closed 6 years ago

#834 closed defect (fixed)

sin(alpha) documentation issues for some cylinder types

Reported by: richardh Owned by: richardh
Priority: minor Milestone: SasView 4.1.0
Component: SasView Keywords:
Cc: Work Package: SasView Documentation


Noted that for some cylinder type models the docs were misleading or even wrong in a couple of places.
I(Q) = integral 0 to pi/2 of F2(Q,alpha)sin(alpha)dalpha

where alpha is angle between rod axis and Q
but usual change of variable u=cos(alpha) means the code does
I(Q) = integral 0 to 1 of F2(Q,u)du
[where strictly we then must do e.g. sin(alpha)=sqrt(1-u2), ]
though some text books also give just this form!

I am making some corections and improvements.

Change History (1)

comment:1 Changed 6 years ago by richardh

  • Resolution set to fixed
  • Status changed from new to closed

Have also changed orientation angle of rod to Q, called theta in some documentation, to alpha to avoid confusion with the new "orientation angle of rod axis to incident beam direction" theta!

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