problem with bwmorph(A,'thin',inf)

I have a matrix 

A=   1     1     1     1     1     1     1
     1     1     1     1     1     1     1
     1     1     1     1     1     1     1
     1     1     1     1     1     1     1
     1     1     1     1     1     1     1
     1     1     1     1     1     1     1
     1     1     1     1     1     1     1
     1     1     1     1     1     1     1
     1     1     1     1     1     1     1
     1     1     1     1     1     1     1
     1     1     1     1     1     1     1

Shouldn't function B=bwmorph(A,'thin',inf) return me matrix 

B=   0     0     0     1     0     0     0
     0     0     0     1     0     0     0
     0     0     0     1     0     0     0
     0     0     0     1     0     0     0
     0     0     0     1     0     0     0
     0     0     0     1     0     0     0
     0     0     0     1     0     0     0
     0     0     0     1     0     0     0
     0     0     0     1     0     0     0
     0     0     0     1     0     0     0
     0     0     0     1     0     0     0

but instead I am getting 

B=
     0     0     0     0     0     0     0
     0     0     0     0     0     0     0
     0     0     0     0     0     0     0
     0     0     0     1     0     0     0
     0     0     0     1     0     0     0
     0     0     0     1     0     0     0
     0     0     0     1     0     0     0
     0     0     0     1     0     0     0
     0     0     0     0     0     0     0
     0     0     0     0     0     0     0
     0     0     0     0     0     0     0