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Error using matlab.ui.​control.Ed​itField/se​t.Value 'Value' must be a character vector or a string scalar.

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So I've using App Designer to import a file. I'm giving the user an option to pick Beginning and Endings dates for the file that they are importing. Here is some of my code that I've used in the past (as a function) to check to see if the user put anything for the Beginning dates and if they did, it uses 'datetime' and 'timerange' to and the dates to the readtable function.
if ~isempty(app.BeginningEditField.Value)
app.BeginningEditField.Value = datetime(app.BeginningEditField.Value,'InputFormat',app.OutputDateTimeStringFormat);
app.EndingEditField.Value = datetime(app.EndingEditField.Value,'InputFormat',app.OutputDateTimeStringFormat);
TR = timerange(app.BeginningEditField.Value, app.EndingEditField.Value, 'closed');
InTable = InTable(TR,:);
end
The variable app.OutputDateTimeStringFormat is set to 'yyyy/MM/dd HH:mm:ss'
Whever I type in a date in the Beginning and Ending Edit Field (with the same format as the app.OutputDateTimeStringFormat) I get this error.
Error using matlab.ui.control.EditField/set.Value (line 98)
'Value' must be a character vector or a string scalar.
I've tried using 'num2str(app.BeginningEditField.Value)' to possible change that into a string which could be used with this function but that does not work.
P.S. this error occurs on the 2nd and 3rd line. (where it uses 'datetime' function)

Accepted Answer

Fangjun Jiang
Fangjun Jiang on 2 Jun 2020
Edited: Fangjun Jiang on 2 Jun 2020
  1. The value for "app.BeginningEditField.Value" needs to be a character vector or string scalr. datetime() returns an object of the "datetime" class. That is the mismatch.
  2. Try datestr() instead of num2str()
  3. You are re-assign "app.BeginningEditField.Value" in the code. Would using a separate variable avoid this problem?
if ~isempty(app.BeginningEditField.Value)
StartValue = datetime(app.BeginningEditField.Value,'InputFormat',app.OutputDateTimeStringFormat);
EndValue = datetime(app.EndingEditField.Value,'InputFormat',app.OutputDateTimeStringFormat);
TR = timerange(StartValue, EndValue, 'closed');
InTable = InTable(TR,:);
end
  4 Comments
Forrest Ward
Forrest Ward on 2 Jun 2020
Hold up, using 'timetable2table' actually worked!! And I found out my problem with the dates! My input for the dates just needed to be in a different format.

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