shared-snippets/matlab/catalog/eliminateEmptyValues.m

%
% -----------------
% Copyright © 2019 ACK Cyfronet AGH, Poland. 
%
% This work was partially funded by EPOS Project funded in frame of PL-POIR4.2
% --------------
%
function varargout = eliminateEmptyValues(varargin)
% ELIMINATEEMPTYVALUES Removes empty values from input columns
%
%   [out1, out2, ...] = ELIMINATEEMPTYVALUES(in1, in2, ...) removes empty
%   or NaN values from the input columns. The function takes a variable
%   number of input arguments and returns the corresponding output columns
%   without empty or NaN values. The inputs can be numeric arrays or cell
%   arrays, and the function will remove entries that are empty in any of
%   the input columns.
%
%   This function is designed to work with catalog objects. For more
%   information about the catalog format, refer to the documentation:
%   https://docs.cyfronet.pl/display/ISDOC/Catalog+-+description
%
%   Example:
%       [a, b] = eliminateEmptyValues([1, NaN, 3], {'A', '', 'C'});
%       % Result: a = [1, 3], b = {'A', 'C'}
%

    if isempty(varargin)
        return;
    end
    indexes = 1:length(varargin{1});
    for i = 1:length(varargin)
        column = varargin{i};
        if isnumeric(column)
            indexes = intersect(indexes, find(~isnan(column)));
        elseif iscell(column)
            indexes = intersect(indexes, find(~cellfun(@isempty, column)));
        end
    end
    for i = 1:length(varargin)
        varargout{i} = varargin{i}(indexes);
    end
end