Purpose: Reads (part of) a text file. The parameter file must be a filename and of type string, fromline and numlines are integers. If fromline is not given it defaults to 0. If numlines is not given it defaults to all lines starting from fromline to the end of the file.
Return Values: If the file was read successfully, an array is returned with numlines elements where element i contains line fromline+i of the file with name file. If an error occurred while reading the file, a string is returned denoting the error message.
The function is not allowed in
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