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66 lines
3.2 KiB
Matlab
66 lines
3.2 KiB
Matlab
% function residues = findresidues(phase)
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% Receives phase in radians, returns map of residues
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% Manuel Guizar - Sept 27, 2011
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% R. M. Goldstein, H. A. Zebker and C. L. Werner, Radio Science 23, 713-720
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% (1988).
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% Inputs
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% phase Phase in radians
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% disp = 0, No feedback
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% = 1, Text feedback (additional computation)
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% = 2, Text and graphic display (additional computation)
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% Outputs
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% residues Map of residues, note they are valued +1 or -1
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%*-----------------------------------------------------------------------*
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%| |
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%| Except where otherwise noted, this work is licensed under a |
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%| Creative Commons Attribution-NonCommercial-ShareAlike 4.0 |
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%| International (CC BY-NC-SA 4.0) license. |
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%| |
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%| Copyright (c) 2017 by Paul Scherrer Institute (http://www.psi.ch) |
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%| |
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%| Author: CXS group, PSI |
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%*-----------------------------------------------------------------------*
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% You may use this code with the following provisions:
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%
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% If the code is fully or partially redistributed, or rewritten in another
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% computing language this notice should be included in the redistribution.
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%
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% If this code, or subfunctions or parts of it, is used for research in a
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% publication or if it is fully or partially rewritten for another
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% computing language the authors and institution should be acknowledged
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% in written form in the publication: “Data processing was carried out
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% using the “cSAXS matlab package” developed by the CXS group,
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% Paul Scherrer Institut, Switzerland.”
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% Variations on the latter text can be incorporated upon discussion with
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% the CXS group if needed to more specifically reflect the use of the package
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% for the published work.
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%
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% A publication that focuses on describing features, or parameters, that
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% are already existing in the code should be first discussed with the
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% authors.
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%
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% This code and subroutines are part of a continuous development, they
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% are provided “as they are” without guarantees or liability on part
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% of PSI or the authors. It is the user responsibility to ensure its
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% proper use and the correctness of the results.
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function residues = findresidues(phase)
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if ~isreal(phase)
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phase = angle(phase);
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end
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residues = wrapToPi(phase(2:end,1:end-1,:) - phase(1:end-1,1:end-1,:));
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residues = residues + wrapToPi(phase(2:end,2:end,:) - phase(2:end,1:end-1,:));
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residues = residues + wrapToPi(phase(1:end-1,2:end,:) - phase(2:end,2:end,:));
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residues = residues + wrapToPi(phase(1:end-1,1:end-1,:) - phase(1:end-1,2:end,:));
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residues = residues/(2*pi);
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end
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function x = wrapToPi(x)
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x = mod(x+pi, 2*pi)-pi;
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end
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