Help with diff(sqrt()) function in terms of time series

year10 is the time series data set below
11.64
11.50
11.49

...I tried my best to produce actual code.  

year1 is the time series data set below
11.64
11.50
11.49
11.16
11.15
11.37
11.37
11.57
11.83
11.87
11.85
11.92
11.77
11.71
11.57
11.24
11.27
11.33
11.17
.................

With a total of 1304 rows of data.

When I try to run the code:
diff(sqrt(year10))

I get the response: "data frame with 0 columns and 1304 rows" and then I
subsequently try to convert my data into a time series with the 

function:
 yearstate = ts(diff(sqrt(year10)))

yearstate

Time Series:
Start = 1 
End = 1304 
Frequency = 1 

   1
   2
   3
   4
   5
............all the way to 1304.  So, it basically erased all of my 

data, and the data are just row numbers all the way to 1304...  Any help
would be appreciated.  I tried my best to produce actual code. 
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