How to create a tabularTextDatastore with multiple files in subfolders?

Question

Stepp Gyogi 2020-8-19

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/581453-how-to-create-a-tabulartextdatastore-with-multiple-files-in-subfolders

评论： Stepp Gyogi 2020-8-19

This is my first attempt at datastores. I have a folder with multiple sub-folders, each subfolder currently contains 1 csv file (though they might contain more in the future).

I create the object using the following code:

ds = tabularTextDatastore( '~/data/folder_with_subfolders/*' );

This generates the following error: Error using tabularTextDatastore (line 93). Not enough input arguments.

I have tried a number of different things:

instead of the wildcard, I included the 'IncludeSubfolders', true name/value pair;
tried adding headers to the CSV file in case that was needed for creating column names;
renamed the file to a simple name.csv (currently the files are automatically generated from a database);
specified the .csv FileExtensions option...

The documentation shows how to create a datastore from one csv file, but that is not my use case... What am I missing? Thanks!

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Answer 1

Walter Roberson 2020-8-19

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/581453-how-to-create-a-tabulartextdatastore-with-multiple-files-in-subfolders#answer_481928

在 MATLAB Online 中打开

What shows up for

which -all tabularTextDatastore

In your release, line 93 should be a comment, with there not being any executable code until about line 120.

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Stepp Gyogi 2020-8-19

Thank you so much I was becoming nuts with this thing!

You were absolutely correct: some old "toolboxes" which I had modified were included in my personal path (I have some automation in my startup file for automatically including a bunch of things in my path to make my life "easier" most of the time). The tabularTextDatastore file was conflicting.

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