Sample data files: The files data.1 through data.6 contain tables of numbers. Only data.5 has two columns; the other files have one column. The file data.5 contains `complex data' with the first column containing the real parts and the second column containing the imaginary. In sm, you can read data into the program by using the following statements: data datafilename read {y 1} The first line tells sm that the new data will be read from a file named `datafilename'. The second line tells sm to fill the vector array `y' with numbers by reading them sequentially from the file. The case of the data file data.5 (complex numbers) could be read by saying: data data.5 read {re 1 im 2}