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Shift array bitwise and multiply with another array in matlab

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POKA
POKA 2017-10-29
评论： KL 2017-10-29
Hello All,
I have two arrays for i.e
x=[1,2,3,4];
y=[5,6,7,8];
I want to multiply y with x
and sum the results after
every bit shift excluding
first one.
So result would be in this
order
R1=70 % no bit shift
R2=64 % y= 8 5 6 7
R3=61 % y= 7 8 5 6
..... Till all bit shifted
And finally plot all
result.
How can I achieve this .
Please suggest .
Thanks all of you

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KL
KL 2017-10-29
编辑：KL 2017-10-29
use circshift
https://de.mathworks.com/help/matlab/ref/circshift.html
R = sum(x.*y)
R1 = sum(x.*circshift(y,1))
R2 = sum(x.*circshift(y,2)) % and so on
  2 个评论
POKA
POKA 2017-10-29
But for lengthy array say length of 1023 how to use it . shall I use loop
KL
KL 2017-10-29
Yes, or you can let matlab run the loop in the background. For example,
shiftAmount = 0:size(y,2);
R = arrayfun(@(z) sum(x.*circshift(y,z)),shiftAmount)

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