Physicians routinely recommend a high-fiber diet that is full of roughage, or insoluble fiber, in order to keep things moving along. While this can be helpful, in some cases a high-fiber diet may actually promote intestinal infection. High-fiber diets are also high-residue diets.
The MATRIX program is designed to perform and to teach row operation algorithms on matrices. The program can work in a decimal floating-point mode in which calculations are carried out to 18 significant digits, or it can work in a fraction mode with exact rational arithmetic.
Thankfully, we already have arrays so give values to a continuous row of registers. So, arrays are a useful way to program compilers to think of them as matrices. In gnu Octave, a 3x3 matrix is provided as an array of values with space character and comma character used as delimiters for rows and columns.