[NUMERIC,TXT,RAW]=XLSREAD(FILE,SHEET,RANGE) reads the data specified
in RANGE from the worksheet SHEET, in the Excel file specified in FILE. The
numeric cells in FILE are returned in NUMERIC, the text cells in FILE are
returned in TXT, while the raw, unprocessed cell content is returned in
RAW. It is possible to select the range of data interactively (see Examples
below). Please note that the full functionality of XLSREAD depends on the
ability to start Excel as a COM server from MATLAB.
help中说的很明白,第一个返回的是数值,第二个是文本,第三个是图像。