Sorting direction must be ''ascend'', ''descend'', ''monotonic'', ''strictascend'', ''strictdescend'', or ''strictmonotonic''. Direction must have one element for each variable you sort on. The input table does not contain row names, returning TRUE. Numeric variable indices must be either positive or negative integers. Variable ''{0}'' must be a 2-dimensional matrix. Issorted on the row labels failed. Issorted on variable ''{0}'' failed, its class is ''{1}''. Cellstr variables not supported. Alternatively, you can convert the cellstr variable ''{0}'' to a string array. Issorted on variable ''{0}'' failed, it contains variable number of columns. Sorting variables must have fixed width.