MATLAB: Reshape table by rows, then merge horizontally and new var names

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Hi
I have a long table dataset with 6 columns (DAY YEAR serial var1 var2 var3). Column DAY repeated values [1, 2, 3, …,365, 1, …,365,….]. Column YEAR has the same value for every 365 rows [2010 repeat365 times, 2011 repeat 365 times,….].
I want it to be divided into every 365 rows (have the same value in column B), merge the new subsets horizontally. Another problem is the reshaped new wide-table will have repeatedly variables names, how can I reshape the table and rename variables to (DAY var1_2010 var2_2010 var4_2010 var1_2011 var2_2011 var3_2011 var1_2012…)? Thank you.

Best Answer

Unstack:
>> t = table([1;1;1;2;2;2;3;3;3;4;4;4],[1;2;3;1;2;3;1;2;3;1;2;3],[1;2;3;4;5;6;7;8;9;10;11;12])
t =
  12×3 table
    Var1    Var2    Var3
    ____    ____    ____
     1       1        1 
     1       2        2 
     1       3        3 
     2       1        4 
     2       2        5 
     2       3        6 
     3       1        7 
     3       2        8 
     3       3        9 
     4       1       10 
     4       2       11 
     4       3       12 
>> unstack(t,'Var3','Var2','GroupingVariable','Var1')
Warning: Table variable names were modified to make them valid MATLAB identifiers. 
ans =
  4×4 table
    Var1    x1    x2    x3
    ____    __    __    __
     1       1     2     3
     2       4     5     6
     3       7     8     9
     4      10    11    12
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