Change type of datastore

Question

Eva-Maria Weiss 2019-7-12

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https://ww2.mathworks.cn/matlabcentral/answers/471430-change-type-of-datastore

编辑： Eva-Maria Weiss 2019-7-22

Hi Everbody,

does anyone know, if there is a possibility to get a tall array from a .csv file not as tabular type, but as array?

So my problem is, I can create a database from that csv file, convert it to a tall array, everything is fine and quick. But when I whant to load data to memory by using gather it takes an incredible huge amount of time.

I've read, that the performance on tables is poor compared to arrays, so I thought it would be good to have the data as tall array instead of having it as tall tabular data.

Can anyone help? I appreciate any hint!

Best regards

Eva

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Answer 1

Eva-Maria Weiss 2019-7-19

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https://ww2.mathworks.cn/matlabcentral/answers/471430-change-type-of-datastore#answer_383878

编辑：Eva-Maria Weiss 2019-7-22

在 MATLAB Online 中打开

Luckily I found out how I can solve that problem. So I love to share it to all:

I don't have necessarily evaluate data from tall table by gather, since functions can be assigned to tall data. Matlab keeps track on all operations.
Table2array works to convert tall table to tall double.

For example a solution can now be

temp = table2array(tallDat(:,2));

Best regards

Eva