MATLAB: Change numbers in array

arrayif statement

Say that an input ask you to input numbers
Ex: [50 -6 14]
, but it won't allow you to enter numbers equal to or less than zero.
How do I build an if statement that would allow me to replace the negative or zero number?
Reminder: all the inputs are placed all in one input( at the same time); not seperately.

Best Answer

you can do this: 
 array = input('Please enter array');
array(array<=0)=nan
or this :
a=true;
while a
array = input('Please enter array with  numbers >= 0');
a=sum(array<0)>0;
end
edit: 
a=false;
while not(a)
array = input('Please enter array 1x3:');
a=isequal(size(array),[1,3]);
end
for k=1:3
    if array(k)<=0
        a=true;
        while a
            newvalue=input(num2str(k,'Please replace index %i, because must be greater than 0'));
            a=newvalue<=0;
        end
        array(k)=newvalue;
    end
end
disp(array);
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