How to create a symmetrical matrix out of a column?

Question

For example, I want to turn the following column:

[90; 175; 600; 650; 655; 660] 

into the matrix:

[ 90, 175, 600, 650, 655, 66         


        

Answer 1

The built-in function toeplitz gives what you want after a couple of flips:

>> col = [90; 175; 600; 650; 655; 660];
>> result = flipud(toeplitz(flip(col)))
result =
    90   175   600   650   655   660
   175   600   650   655   660   655
   600   650   655   660   655   650
   650   655   660   655   650   600
   655   660   655   650   600   175
   660   655   650   600   175    90