APP DESIGNER EDIT FIELD ISSUE---HELP REQUESTED

Hi,

Running 2024b:

I'm seeing a weird issue with Edit Field (numeric) values in App Designer. When I enter numbers, then try to confirm what the values are with the Test button, I get character symbols, rather than numbers in the command window. I can avoid this with Edit Field (Text)---but I can't for the life of me figure out why the numeric field entries aren't working. Similarly, I tried adding a spinner and displaying its value on a UI, but it is also corrupted. The numeric field shows the same odd behavior with a UI display as well.

I've attached the app.

[Steven Lord]

Can you show the code in the callback for your Test button?

Answer 1

[Walter Roberson]

Your code has

            disp(['EditField1.Value =' , app.EditField.Value]);

This does a horzcat() operation between a character vector and a numeric value. The [] operation between a character vector and a numeric value is defined as [CHARACTERVECTOR char(uint16(floor(NUMERICVALUE)))] . Which is to say that the numeric values are treated as unicode character positions and the corresponding characters are output.

[] between a character vector and a numeric value does not format the numeric value as printable characters.

You need one of

            disp("EditField1.Value =" + app.EditField.Value);

or

            disp(compose("EditField1.Value = %g", app.EditField.Value));

or

            fprintf('EditField1.Value = %g\n', app.EditField.Value)

or

            fprintf('EditField1.Value = %.999g\n', app.EditField.Value)

The first version will output the Value with no more than 4 numeric places after the decimal. The %g versions will output the Value with no more than 5 numeric places after the decimal. The version with %.999g will output the value with full and complete precision of value stored, such as 0.1000000000000000055511151231257827021181583404541015625 for 0.1

[Alex]

Thanks!

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