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+utils/radtap.m

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+% FUNCTION taperfunc = radtap(X,Y,tappix,zerorad), 
+% Creates a central cosine tapering for
+% beamstop. Recieves the X and Y coordinates, tappix is the extent of
+% tapering, zerorad is the radius with no data (zeros).
+
+%*-----------------------------------------------------------------------*
+%|                                                                       |
+%|  Except where otherwise noted, this work is licensed under a          |
+%|  Creative Commons Attribution-NonCommercial-ShareAlike 4.0            |
+%|  International (CC BY-NC-SA 4.0) license.                             |
+%|                                                                       |
+%|  Copyright (c) 2017 by Paul Scherrer Institute (http://www.psi.ch)    |
+%|                                                                       |
+%|       Author: CXS group, PSI                                          |
+%*-----------------------------------------------------------------------*
+% You may use this code with the following provisions:
+%
+% If the code is fully or partially redistributed, or rewritten in another
+%   computing language this notice should be included in the redistribution.
+%
+% If this code, or subfunctions or parts of it, is used for research in a 
+%   publication or if it is fully or partially rewritten for another 
+%   computing language the authors and institution should be acknowledged 
+%   in written form in the publication: “Data processing was carried out 
+%   using the “cSAXS matlab package” developed by the CXS group,
+%   Paul Scherrer Institut, Switzerland.” 
+%   Variations on the latter text can be incorporated upon discussion with 
+%   the CXS group if needed to more specifically reflect the use of the package 
+%   for the published work.
+%
+% A publication that focuses on describing features, or parameters, that
+%    are already existing in the code should be first discussed with the
+%    authors.
+%   
+% This code and subroutines are part of a continuous development, they 
+%    are provided “as they are” without guarantees or liability on part
+%    of PSI or the authors. It is the user responsibility to ensure its 
+%    proper use and the correctness of the results.
+
+function taperfunc = radtap(X,Y,tappix,zerorad),
+
+tau = 2*tappix; % period of cosine function (only half a period is used)
+
+R = sqrt(X.^2+Y.^2);
+% taperfunc = (R)>=10;
+taperfunc = 0.5*(1+cos(  2*pi*(R-zerorad-tau/2)/tau  ));
+taperfunc = (R>zerorad+tau/2)*1.0 + taperfunc.*(R<=zerorad+tau/2);
+taperfunc = taperfunc.*(R>=zerorad);