fundamental principle of multiplication
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i have 4 numbers as a row vector, p=[ 1 -1 j -j ];
Now, total number of different 4 digit numbers formed using elements of "p" is 4^4=256
Thus i need a 256*4 matrix.
How to create such a 256*4 matrix ?
2 Kommentare
Image Analyst
am 12 Okt. 2013
What is a 4 digit number? Can you give an example of the first 6 rows of what you want at the result?
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Sean de Wolski
am 11 Okt. 2013
[xx,yy,zz,qq] = ndgrid('1234');
V = [xx(:) yy(:) xx(:) qq(:)]
Cedric
am 12 Okt. 2013
Bearbeitet: Cedric
am 12 Okt. 2013
I guess that the following would work. I didn't think too much about it though and there must be a simpler or even trivial solution..
>> ID = mod(floor((0:255).' * 2.^[0:-2:-6]), 4) + 1 ;
>> p(ID)
Check
>> size(unique(ID, 'rows'))
ans =
256 4
2 Kommentare
Cedric
am 12 Okt. 2013
Bearbeitet: Cedric
am 12 Okt. 2013
Just in case nobody proposes a better solution, the way this one works is comparable to the way you build tables of binary codes.. you build the first column as 01010101.., the second as 0011001100.., the third as 000011110000.., and so on. My solution does the same in base 4.
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