Create empty dataset and populate it row by row

2011 10 24
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Hi,
I'm trying to create an object of the class dataset (Stats toolbox) with a few named "columns". I want such object to initially have no rows. Then, I would like to add new rows one by one. I've tried the code below to create the dataset but I get an error. Can anyone help me with this?
Thanks in advance
P.S. I could not submit this question to the "answers" section of the Mathworks website
% Column names are 'F1' and 'F2'
myDS = dataset([],'VarNames',{'F1','F2'})
??? Error using ==> setvarnames at 23
NEWNAMES must have one name for each variable in A.
Error in ==> dataset.dataset>dataset.dataset at 383
a = setvarnames(a,varnames); % names will be modified to make them valid

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Mark
Mark 2011-10-24

0 个投票

Fangjun Jiang 23 minutes ago
VarNames={'F1','F2'}; myDS=dataset([],[],'VarNames',VarNames)

更多回答（1 个）

Fangjun Jiang
Fangjun Jiang 2011-10-24

0 个投票

myDS =dataset({[],'F1'},{[],'F2'});
Or to see it, myDS =dataset({1,'F1'},{2,'F2'})

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Mark
Mark 2011-10-24
Thank you, but I want to avoid putting each variable name individually. I thought that the 'VarNames' was supposed to do that. I want a dataset with two columns, one is numeric and the other contains strings. How do I do that with the 'VarNames' option?
Fangjun Jiang
Fangjun Jiang 2011-10-24
VarNames={'F1','F2'};
myDS=dataset([],[],'VarNames',VarNames)
Mark
Mark 2011-10-24
That worked, thanks

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