Specify data type for import data from csv by using readtable with different number of columns

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Die Eule
Die Eule 2019 年 2 月 4 日
Hello everybody,
i tried to import a .csv file with different number of columns. I used readtable. The only way to do so was to set the ExtraColumnsRule to 'addvars'. But that gives some entries with ExtraVar in my table, where I can not specify the data type. I would like to read them as double, but they are char by default and are not accessable...
can you give me a hint how to solv that?
I'm using Matlab 2017b, but delimitedTextImportOptions and fixedWidthImportOptions are not available...
I attached a file with testdata and the code.
Regards,
Christian

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