Table: Reshape based on Cell Column and Sort

Question

Dave 2019-1-12

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评论： Dave 2019-1-13

Is there a way to reshape or transform a table 7x3 table into a table with as many columns as the unique elements of a cell column?

Orignal table 7x3 (var1 double, var2 cell, var3 double)

Table1=

1 AAA 100

3 AAA 500

1 BBB 300

2 AAA 250

4 BBB 50

2 BBB NaN

3 BBB 100

A sub table,3x3, for only AAA would be

Table2=

1 AAA 100

2 AAA 250

3 AAA 500

A subtable, 4x3, for only BBB would be

Table3=

1 BBB 300

2 BBB NaN

3 BBB 100

4 BBB 50

The target table, 4x3, is

Table4=

1 100 300

2 250 NaN

3 500 100

4 NaN 50

I do not need table 2 and 3, only interested in table 4. Table 4 keeps the first column and following columns refer to the AAA BBB ...

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Answer 1

Guillaume 2019-1-12

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unstack will do exactly that:

>> t = table([1;3;1;2;4;2;3], {'AAA';'AAA';'BBB';'AAA';'BBB';'BBB';'BBB'},[100;500;300;250;50;NaN;100])
t =
  7×3 table
    Var1    Var2     Var3
    ____    _____    ____
     1      'AAA'    100 
     3      'AAA'    500 
     1      'BBB'    300 
     2      'AAA'    250 
     4      'BBB'     50 
     2      'BBB'    NaN 
     3      'BBB'    100 
     
>> unstack(t, 'Var3', 'Var2')
ans =
  4×3 table
    Var1    AAA    BBB
    ____    ___    ___
     1      100    300
     3      500    100
     2      250    NaN
     4      NaN     50