left shift in bits

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ablaze
ablaze 2017-2-2
评论： Walter Roberson 2017-2-3
hello, i want to perform left shift by 1 bit in this code for left_1 and right_1
% 1 2 3 4 5 6 7 8 9 10
key=[1 0 1 0 0 0 0 0 1 0]
IP=[3 5 2 7 4 10 1 9 8 6]
left=key(IP(1:5))
left_1=left
right=key(IP(6:10))
right_1=right
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ablaze
ablaze 2017-2-3
circular shift
Walter Roberson
Walter Roberson 2017-2-3
How many bits width?

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回答（1 个）

Walter Roberson
Walter Roberson 2017-2-2
Multiply by 2.
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Walter Roberson
Walter Roberson 2017-2-3
For 4 bits (as your values are small):
shifted = pre_shifted * 2;
mask = shifted >= 16;
shifted(mask) = shifted(mask) - 15;

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