Sort Vectors Into Fractiles

Sort vectors into fractiles.

% y=fractile(x,f,0);
% PURPOSE: Sort and devide a column vector x into fractiles
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% USAGE: y=fractile(x,f,ascending);
% where: y = a cell array structure containing output fractiles and their index numbers
% x = the input vector
% f = the number of fractiles to be devided into
% ascending = 1 or 0, the logical switch that specifies
% an ascending sort (0) or a descending sort (1)
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