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

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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
%Obtener las columnas de la tabla
k=find(h<0); j=find(tP<0); l=find(tT<0);

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Cris LaPierre
Cris LaPierre il 18 Mar 2023
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.
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Cris LaPierre
Cris LaPierre il 18 Mar 2023
Modificato: Cris LaPierre il 18 Mar 2023
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

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