accessing specific records of a given dataset

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Sebastiano delre 2014-1-15

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关闭： MATLAB Answer Bot 2021-8-20

Hello! I have the following 5x4 dataset, called DB:

val =

    line    title            replyno    author        
     'Avensis'        1          'lui'         
     'Avensis'        2          'tu'          
     'Costs'          1          'pasquale'    
     'Costs'          2          'io'          
     'Costs'          3          'pasquale'

I want to access only records whose author is 'pasquale'. How can I do? I use new_DB = DB(DB.author=='pasquale'), but it does not work, it tells me "Undefined function 'eq' for input arguments of type 'cell'".

Thank you!

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Sebastiano delre 2014-1-15

I got it, I had to make the variable author nominal first: DB.author=nominal(DB.author). Then it works. Thanks anyway!

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Answer 1

Image Analyst 2014-1-15

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https://ww2.mathworks.cn/matlabcentral/answers/112463-accessing-specific-records-of-a-given-dataset#answer_120948

Try strcmpi(), strfind(), or ismember(). Try char() if you need to convert a cell into a character string. Disclaimer: I don't work with dataset class of variables.