How to extract a negative value from a column vector? App designer

Hello, I programmed an UITable and I want to establish a condition that warns the user when entering values n<0, but I'm not sure how to do it. I tried with the "contain" command but it says "not enought input arguments", I also tried with the "find" command but I don't know how to set the condition with that one. I'll attatch my code and app. Thanks

            %Obtener los datos de la tabla
            tabla=app.UITable.Data; 
            M=cell2mat(tabla)
            %Obtener las columnas de la tabla
            h=M(:,1)
            tP=M(:,2)
            tT=M(:,3)

            k=find(h<0); j=find(tP<0); l=find(tT<0);

Answer 1

[Cris LaPierre]

I think you would need to define the CellEditCallback function. This function will execute everytime a cell is edited. You would just to write code to check the value and provide the warning when your condition is met.

[Giulia Di Giorgio]

Hi Cris, perhaps I'm not doing it right, but I'm getting this error:

The "indices" and "newData" variables were defined automatically by MatLab.

[Cris LaPierre]

You only need to use newData, as that will be the value the user has entered.

contains is for strings, not numbers. Use a relational operator instead:

if newData<0
    % your code here
end

[Giulia Di Giorgio]

Thank you Cris, it works perfectly!