create non uniform increment vector

hi

how can I in a single command creat this vector:

a=12345678910987654321

thanks

Answer 1

[Robin Kirsch]

a = [1:10 9:-1:1]

a =

  Columns 1 through 13

     1     2     3     4     5     6     7     8     9    10     9     8     7

  Columns 14 through 19

     6     5     4     3     2     1

Answer 2

[KSSV]

k = num2str([1:10 9:-1:1]) ; 
k(k == ' ') = [] ;
k