Testing if a input is a numerical (double) of character
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Jucimar Carpe
le 18 Août 2019
Commenté : Jucimar Carpe
le 18 Août 2019
Hi folks, i'm implementing a software on appDesigner and i want to prevent wrong entries from users.
I've tried to use the folowing code but it's not working. My gol would be, check if the user entered with a number or character. If it's a number then OK, otherwise open a warning dialog box informing the error and then stop the program.
The way i've writed it's not working.
Sbase_gerador = str2double(strrep((app.potencia.Value),',','.'));% Read entry data and convert comma to '.' if needed
teste_potencia = isnumeric(Sbase_gerador)
if teste_potencia==0
opts= struct('WindowStyle','modal','Interpreter','tex');
tensao_incorreta_t2 = warndlg('\fontsize{11}Caracteres diferentes de números não são aceitos.',...
'Entrada incorreta de dados', opts);
app.potencia.Value='0';
end
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Adam Danz
le 18 Août 2019
Modifié(e) : Adam Danz
le 18 Août 2019
You can use str2double() to convert the string to numeric. If the string did not contain something that can be converted to numeric, it will return NaN.
isNumber = ~isnan(str2double(str));
Examples
isNumber = ~isnan(str2double('100')) % true
isNumber = ~isnan(str2double(' 100 ')) % true
isNumber = ~isnan(str2double('3.1415926')) % true
isNumber = ~isnan(str2double('8.3205e+24')) % true
isNumber = ~isnan(str2double('Abcd')) % false
isNumber = ~isnan(str2double('5 and 7')) % false
6 commentaires
Adam Danz
le 18 Août 2019
Do you mean a certain input is not producing the expected output with the code from my answer? Or is there a different problem?
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