Read Excel sheet into a structure array

% outstruct=xls2struct(xlsFName,sheetnum)
% This function reads the sheet of 'sheetnum' of the input Excel file('xlsFName') and convert it into a
% 1x1 structure array 'outstruct' containing column fields.
% Each field in the output structure containes the data of the
% corresponding column in the input Excel sheet.
% The input Excel sheet MUST content a header row as the first row, which
% will serve as the field name of the output struct.
% 'sheetnum' : the number of the sheet in the input Excel file from which
% the data are read. Default = 1
% Example:
% xls2struct('text.xlsx');
%
% See also 'WriteXlsFromStruct.m'