[gmx-users] secondary structure index

[Anthony Cruz]

Hi:
I want to make an index were I one group correspond to alpha helix other to 
beta sheet and other, essentially 3 groups. This is what I have been trying:
(A)
r 3-11 r 15-22

Found 81 atoms with res.nr. in range 3-11

Syntax error: "r 15-22"
(B)

r 3-11 & r 15-22

Found 81 atoms with res.nr. in range 3-11
Found 86 atoms with res.nr. in range 15-22
Merged two groups with AND: 81 86 -> 0
Group is empty
(C)
r 3-11 14-25

Found 81 atoms with res.nr. in range 3-11

Syntax error: "14-25"


How I can do it????

Best regards,
Anthony