how can i validate in my code if a user inputs non numeric values? how can i limit just for 4 values?

this code request four values separated by comma
for vgauss=1:x
prompt={'Ingrese los valores del gaussiano separados por comas: '};
b = inputdlg(prompt,'Gaussiano', [1 50]);
w=b{1,1};
EnChar{1,vgauss}=w;
data{1,vgauss}=str2double(regexp(w,'\d*','match')');
handles.data=data; %estos son los gaussianos [...]
handles.CharGauss=EnChar;
end

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