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2026-09-17 19:39:08 +09:00 · 2026-08-07 15:56:42 +09:00
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+%GET_UNIT_LENGTH returns the SI unit for a given length
+% [unit,val] = get_length_unit(val)
+% Assumes that val is given in [m].
+%
+%   **val...         length
+%
+%   returns:
+%   ++ unit          SI unit string
+%   ++ val           input value converted to SI unit
+%
+%   EXAMPLE:
+%       [unit, val] = get_unit_length(2e-3);
+%           unit 
+%               'mm'
+%           val
+%               '2'
+%       
+
+%*-----------------------------------------------------------------------*
+%|                                                                       |
+%|  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 [unit,val] = get_unit_length(val)
+
+units = {'m', 'mm', 'um', 'nm', 'pm', 'fm', 'am'};
+
+scl = 0;
+while true
+    if abs(val)*1e3^(scl)>=1 || scl==length(units)-1
+        val = val*1e3^(scl);
+        unit = units{scl+1};
+        break;
+    else
+        scl = scl+1;
+    end
+end
+
+
+end
+