- #1
gtfitzpatrick
- 379
- 0
Homework Statement
in coding a msg, a black space was represented by 0, an A by 1,a B by 2 etc...The msg was transformed using the matrix
-1 -1 2 0
1 1 -1 0
0 0 -1 1
1 0 0 -1
and sent out as -19,19,25,-21,0,18,-18,15,3,10,-8,3,-2,20,-7,12
so what I've tried is...
so to reverse the transform i think i get the inverse of the transform matrix and multiply by the outputed answer
for the inverse i got
1 1 1 1
0 1 -1 -1
1 1 0 0
1 1 1 0
and multiplied it by
-19 19 25 -21
0 18 -18 15
3 10 -8 3
-2 20 -7 12
and got
-18 67 -8 9
-1 -12 -3 0
-19 37 7 -6
-16 47 -1 -3
which i was just going to convert back into letters to get the msg,but what letter is 67 or 37...Confussed...
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