add iround_os.m to find index and values closest to target values in an array,...

add iround_os.m to find index and values closest to target values in an array, being monotonic or not

git-svn-id: https://spcsvn.epfl.ch/repos/TCV/gdat/trunk@5294 d63d8f72-b253-0410-a779-e742ad2e26cf

crpptbx/iround_os.m

+function  [is,sigi]=iround_os(sig,val)
+% Given two arrays sig and val, for each element in val 
+% returns the index and value of the nearest element in sig.
+% 
+% sig and/or val can be non-monotonic
+%
+% Example:
+%
+% >> [i,sigi]=iround_OS(sig,val);
+%
+%
+%
+for j=1:length(val)
+  [s(j),is(j)]=min(abs(sig-val(j)));
+end
+sigi=sig(is);