Hello,
If I run the script

nulldata 10
smpl 6 10
series y=t
matrix my=y
smpl 1 5
series yy=my
print yy

in gretl 1.9.11 I get

gretl version 1.9.11
Current session: 2016-03-01 18:35
? nulldata 10
periodicity: 1, maxobs: 10
observations range: 1-10
? smpl 6 10
Full data range: 1 - 10 (n = 10)
Current sample: 6 - 10 (n = 5)

? series y=t
Generated series y (ID 2)
? matrix my=y
Generated matrix my
? smpl 1 5
Full data range: 1 - 10 (n = 10)
Current sample: 1 - 5 (n = 5)

? series yy=my
Generated series yy (ID 3)
? print yy

Current sample:  1 - 5 (n = 5)

6.00000  7.00000  8.00000  9.00000  10.0000 

But if I run the same script in Gretl 2016a I get:

gretl version 2016a
Current session: 2016-03-01 18:36

? nulldata 10
periodicity: 1, maxobs: 10
observations range: 1 to 10
? smpl 6 10
Full data range: 1 - 10 (n = 10)
Current sample: 6 - 10 (n = 5)

? series y=t
Generated series y (ID 2)
? matrix my=y
Generated matrix my
? smpl 1 5
Full data range: 1 - 10 (n = 10)
Current sample: 1 - 5 (n = 5)

? series yy=my
Generated series yy (ID 3)
? print yy

Current sample:  1 - 5 (n = 0)

     NA       NA       NA       NA       NA 

In this context, is there a quick way of making the first 5 observations of series yy to equal the content of matrix my, like in older versions of Gretl?

Thanks,
Pedro