First input must be a function handle. Group numbers must be a vector of positive integers, and cannot be a sparse vector. The data variables must have the same number of rows as the vector of group numbers. The group number vector has {0,number,integer} row(s), and data variable {1,number,integer} has {2,number,integer} row(s). The data variables must have the same number of columns as the vector of group numbers. The group number vector has {0,number,integer} column(s), and data variable {1,number,integer} has {2,number,integer} column(s). Applying the function ''{0}'' to the {1} group of data generated the following error:\n\n{2} The function ''{0}'' returned a non-scalar value when applied to the {1} group of data.\n\nTo compute nonscalar values for each group, create an anonymous function to return each value in a scalar cell: \n\n\t{2} For N groups, every integer between 1 and N must occur at least once in the vector of group numbers.