5.6     Matrix
  This menu groups operations which operate on matricies.
nip2 has four ways of displaying a matrix, but they all
behave in the same way under the skin. Almost all the items
in the Math menu will work on matricies. Most of the matrix
operations will also work on images.
    
- 
New 
- The first four items make matricies which display
    and   edit   in   various   ways   useful   for   different
    applications. The final two make matricies which
    are pre-filled with useful numbers.
    
- 
Convert to Matrix 
- Try to make anything into a matrix.
    
- 
Extract 
- This                group                of                items
    extracts various submatricies. You can also do this
    graphically: just drag-select an area in matrix.
    
- 
Insert, Delete, … 
- Also  work  on  images,  which  can  be
    handy. A 45 degree rotate will only work for square
    matricies with odd-length sides.
    
- 
Invert 
- Simple matrix-only maths operations.
    
- 
Plot Scatter 
- This takes a two-column matrix where the
    columns are the X and Y positions of points and
    draws a scatter graph.