MATLAB: Converting a string array into a number array

helpMATLAB

Please how can l convert '123456789' to [ 1 2 3 4 5 6 7 8 9] in MATLAB

#Edited

num_str='123456789'
num_str - '0'

Result:

ans =
     1     2     3     4     5     6     7     8     9

a=[1 2 3 4 5 6 7 8 9] ;
str = char(a+'0')
str = '123456789'

X = str2num( '12e-3 5.9e-3 -8.1e-3 2.56e-3; 5 11.2 17.9 33' )  %edited after kssv's comment