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How to remove 0 (for 'double' numerical type) or [] (for cell type) rows in a table ?

Asked by Pierre Lonfat on 13 Nov 2016
Latest activity Commented on by Walter Roberson
on 14 Nov 2016
Sorry I am new to matlab ! Any help would be really appreciated ! Have a nice evening !
Ps: I tried the function unique but and as usual on matlab, it doesn't work. I guess its because there are two types in the table ('cell' for bankname and 'double' for the other categories).

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Answer by Giovanni Mottola on 13 Nov 2016

Starting point:
tab =
S_Bankname S_CommonEquityTierRatio_2013 S_Log_TotalAssets_2013
__________ ____________________________ ______________________
'' 0.00000000000000e+00 0.00000000000000e+00
'Axa' 1.14661000000000e+00 1.08520000000000e+01
'Carige' 3.90410000000000e-02 1.07440000000000e+01
'MPS' 6.98750000000000e-02 1.23110000000000e+01
'' 0.00000000000000e+00 0.00000000000000e+00
'Cyprus' 7.28620000000000e-02 1.03870000000000e+01
Assuming that the rows to delete have 0 in the second column:
toDelete = tab.S_CommonEquityTierRatio_2013==0;
tab(toDelete,:) = [];
Final result:
tab =
S_Bankname S_CommonEquityTierRatio_2013 S_Log_TotalAssets_2013
__________ ____________________________ ______________________
'Axa' 1.14661000000000e+00 1.08520000000000e+01
'Carige' 3.90410000000000e-02 1.07440000000000e+01
'MPS' 6.98750000000000e-02 1.23110000000000e+01
'Cyprus' 7.28620000000000e-02 1.03870000000000e+01

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Actually I think its not possible to delete a row in a table ! But I should do it in a matrix !
I just tried the code you wrote with the initial data as follows:
S_Bankname={'', 'Axa', 'Carige', 'MPS', '', 'Cyprus'}.';
S_CommonEquityTier1Ratio_2013=[0, 1.14661, 0.039041, 0.069875, 0, 0.072862].';
S_Log_TotalAssets_2013=[0, 10.852, 10.744, 12.311, 0, 10.387].';
I used only a subset of your table to keep things simple.
Using the commands you wrote, that is,
S_Test_Table=table(S_Bankname,S_CommonEquityTier1Ratio_2013,S_Log_TotalAssets_2013)
toDelete = S_Test_Table.S_CommonEquityTier1Ratio_2013==0;
S_Test_Table(toDelete,:) = [];
the table does change and the empty lines are deleted.
Could it be that, in your table, the "empty" rows don't actually have zeros in the second column but instead very small values? Could you provide the full data for your table?
Deleting a row in a table works fine.
a = randi(6,3,1); b = {'hello';'';'zumba'};
t = table(a,b);
toDelete = cellfun(@isempty,t.b);
t(toDelete,:) = [];

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