How to extract desired variables column data from a table?

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Devendra
Devendra 2024-3-7
评论： Mathieu NOE 2024-3-7
I have the data in excel csv file with variable names as follows
Var1 POSValue MAXSum AVGSum SOS POS EOS Base Duration FirstHalf SecondHalf GrowthRate SenescenceRate Peaks total_cane act_y_ha act_per_ha field_yield total_FS variety
However, I want to get only required variables by using following matlab code
features = df.Properties.VariableNames(~ismember(df.Properties.VariableNames, ...
{'POS value', 'MAX sum', 'AVG sum', 'SOS', 'POS', 'EOS', ...
'base', 'duration', 'first half', 'second half', 'growth rate', ...
'senescence rate', 'peaks'}));
Instead it is extracting all the variables.
Please suggest me how to get the required variables.
Dev

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回答（1 个）

Mathieu NOE
Mathieu NOE 2024-3-7
hello
this is one solution
NB that the variables names and the names your are using in the selection are not exactly the same,
like POSValue MAXSum vs POS value , MAX sum and alike....
I corrected this minor bug
T =readtable("data.xlsx");
v = {'POSValue', 'MAXSum', 'AVGSum', 'SOS', 'POS', 'EOS', ...
'Base', 'Duration', 'FirstHalf', 'SecondHalf', 'GrowthRate', ...
'SenescenceRate', 'Peaks'};
v_to_use = v(ismember(v,T.Properties.VariableNames));
new_T = T(:,v_to_use)
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Devendra
Devendra 2024-3-7
Thank you very much for helping me. One more little thing is how to resolve following error
X = T(:, new_T);
A table variable subscript must be a numeric array containing real positive integers, a logical array, a character vector, a string array, a cell array of character vectors, or a pattern scalar used to match variable names.
Dev
Mathieu NOE
Mathieu NOE 2024-3-7
this is not my code : X = T(:, new_T);
new_T is the table extracted from T , so T(:, new_T) is non sense (you cannot use a table as a table subscript
use the code I provided above (it works !!)

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