How to decide, number or character!

A = ';A0sf1001p00';

A(1) = ';'

A(2) = 'A';

A(3) = '0';

I want to following

for n=1:10

X=str2num(A(n));

if X(1) == Number ? <--Waht is the this Code?

num=X;

else

discard

end

end

Result :

num=0100100

Answer 1

[Stephen23]

A = ';A0sf1001p00';
X = isstrprop(A,'digit');
N = A(X)

N = '0100100'

Answer 2

[Steven Lord]

If for whatever reason (homework?) you cannot just use isstrprop like @Stephen23 suggested, look at the documentation page for the str2num function. What is it documented to return if the input is not the text representation of a number? How would you detect that output?