Error using matlab.ui.​control.in​ternal.mod​el.Abstrac​tNumericCo​mponent/se​t.Value (line 111) 'Value' must be a double scalar.

I am trying to create a matlab app converting between different temperatures however when I try to run it for some reason the error message "Error using matlab.ui.control.internal.model.AbstractNumericComponent/set.Value (line 111) 'Value' must be a double scalar" comes out and I am not sure why. Please let me know if you u have any questions!

Answer 1

[Voss]

Try it without converting to string

app.EditField.Value = Re;

because if app.EditField is a NumericEditField, its Value is a number, not a string.

[Patrick Schneider]

Didn't work:(

[Voss]

Still the same error? Verify that Re is a scalar.

[Patrick Schneider]

I checked with TF = isscalar function and it confirmed that it is a scalar.

[Walter Roberson]

For debugging purposes, put a breakpoint at the line

app.EditField.Value = Re;

and query

size(Re)
class(Re)
disp(app.EditField.Value)

[Patrick Schneider]

I put that into my code and no error message comes up now but the converted temperature doesn't show up in the output box

[Walter Roberson]

What were the outputs?

Note that the disp() in particular is intended to be before the assignment... though now that I think about it, it would be good to also have the same statement after the assignment.

[Walter Roberson]

if you change the code to

size(Re)
class(Re)
disp(app.EditField.Value)
app.EditField.Value = Re;
disp(app.EditField.Value)

Then what shows up in the command window?

Answer 2

[Patrick Schneider]

The output is a numeric edit field.