ReadSize must be a positive integer or the character vector, ''file''.

ReadSize — Amount of data to read
'file' (default) | 'sheet' | positive integer scalar
Amount of data to read in a call to the read function, specified as 'file' or 'sheet', or as a positive integer scalar.

If ReadSize is 'file', then each call to read reads all the data one file at a time.

If ReadSize is 'sheet', then each call to read reads all the data one sheet at a time.

If ReadSize is a positive integer, then each call to read reads the rows specified by ReadSize, or fewer if it reaches the end of the data.

When you change ReadSize from an integer scalar to 'file' or 'sheet', or conversely, the datastore resets using the reset function.

Data Types: char | string | double