Undefined function or variable 'detectImportOptions'.

I have a code which is supposed to collect data from multiple text files. (I will attach two of them here). The code used is as follows.

function GUI_for_log_OpeningFcn(hObject, eventdata, handles, varargin)

      disp('Please wait');

      f = dir('*.log');
      handles.alldatatable = [];
      for ii = 1:numel(f)
          DayFile = f(ii).name;
          opts = detectImportOptions(DayFile);
          opts = setvartype(opts,1,'datetime');
          opts = setvaropts(opts,1,'InputFormat','dd.MM.uuuu HH:mm:ss');
          table1 = readtable(DayFile,opts);
          if isempty(handles.alldatatable)
              handles.alldatatable = table1;
          else
              handles.alldatatable = [handles.alldatatable; table1];
          end
      end

      %disp(handles.alldatatable);
      disp('Ready to use');

      setappdata(0,'totData',handles.alldatatable);

      str = {f.name};
      set(handles.listbox1,'String',str); %set string

      %evalin('base','clear all');
      %evalin('base','clc');

      listString = get(handles.listbox3,'String');
      assignin('base','listString',listString);

This works fine on any Matlab which is after 2016b, but how do I alter this code to use it on a Matlab before 2016b? The error that comes if I use it in an older version is

Undefined function or variable 'detectImportOptions'.

Error in GUI_for_log_GUI_for_log_OpeningFcn (line 56)
        opts = detectImportOptions(DayFile);

Error in gui_mainfcn (line 220)
    feval(gui_State.gui_OpeningFcn, gui_hFigure, [], guidata(gui_hFigure), varargin{:});

Error in GUI_for_log (line 42)
    gui_mainfcn(gui_State, varargin{:});

The issue is with 'detectImportOptions' which is not available in versions before 2016b. Is there an alternative function I can use instead of this function in, say, 2015a? Or perhaps is there a way to install a toolkit to use this code without alterations?

[Stephen23]

"... how do I alter this code to use it on a Matlab before 2016b?"

Either:

• Write all of the required functions yourself (not trivial).
• Rewrite your code to use the features provided with earlier MATLAB versions.

[Chamath Vithanawasam]

If I am to rewrite my code, how can I go about collecting data from the .txt file? Because the data is arranged in 144 columns, along with a date/time column as well. I need all that data in one table.

Answer 1

[Walter Roberson]

Tested code.

filename = 'SI010218.txt';

fid = fopen(filename, 'rt');

header_cell = textscan(fid, '%[^\n]', 1, 'HeaderLines', 12);
header_fields = regexp(header_cell{1}{1}, ';', 'split');
junk = fgetl(fid);   %because of the ^\n the \n is still in the buffer

units_line = fgetl(fid);
units_fields = regexp(units_line, ';', 'split');

numfields = length(header_fields);
fmt_cell = repmat({'%f'}, 1, numfields);
fmt_cell{1} = '%[^;]';  %D format cannot handle embedded blanks
fmt_cell{100} = '%{HH:mm:ss}D';
fmt = [fmt_cell{:}];

data_cell = textscan(fid, fmt, 'delimiter', ';', 'CollectOutput', true);
fclose(fid);

data_cell2D = [num2cell( datetime( data_cell{1}, 'InputFormat', 'dd.MM.uuuu HH:mm:ss') ), ...
               num2cell( data_cell{2} ), ...  %numeric
               num2cell( data_cell{3}  - dateshift(data_cell{3}, 'start', 'day') ), ...  %datetime, make it duration
               num2cell( data_cell{4} ) ];    %numeric

adjusted_headers = matlab.lang.makeUniqueStrings( matlab.lang.makeValidName( header_fields ) );

table1 = cell2table(data_cell2D, 'VariableNames', adjusted_headers);
table1.Properties.VariableDescriptions = header_fields;
table1.Properties.VariableUnits = units_fields;

Your 100'th field is AptTmRmg specified as HH:mm:ss . Your posted code probably imports it as a character vector; I convert it into a duration .

[Chamath Vithanawasam]

Thanks a lot! This works.