Resolving Matrix dimensions must agree

I am creating a unit converter app with app designer and I am having trouble with the following switch statement and getting the error - Matrix dimensions must agree.

The app should select between imperial and Metric conversion, and should swap units via a drop down box.

I tried using a switch case instead of an if/else statement but it also didn't recognise the case parameters.

The problem lies within my 'if' conditions, i.e. if app.DropDown.Value == char('Celsius to Fahrenheit') --- it either says Matrix dimensions must agree or it goes straight to my error message.

How do i get the code to read what units are in the drop down box and then run that code?

[Stephen23]

Note that calling char on a character vector does nothing, it returns exactly the same char vector unchanged.

Answer 1

[Stephen23]

Use strcmp or strcmpi to check if two text strings match or not:

if strcmp(A,B)

Alternatively you could use one switch statement:

switch app.DropDown.value
    case 'Celcius to Farenheit'
        ..
    case 'etcetera'
        ..
    otherwise
        error('Oh No, I don''t know what to do with this!')
end

[Hannah Quirk]

I decided to use the if strcmp(A,B) format, and it worked!

Thank you for this.