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how to find the nearest smallest power of 2 to an integer?

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Mnr
Mnr 2015-5-5
评论： Mnr 2015-5-5
Hello all,
I would like to write a code that finds the nearest smallest power of 2 to integers. For instance, if my integer is 6, its smallest nearest power of 2 is 4, while if the integer is 12, the smallest nearest integer is 8. I would appreciate if somebody can help me please. Thanks.

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Stephen23
Stephen23 2015-5-5
编辑：Stephen23 2015-5-5
>> N = 6;
>> pow2(floor(log2(N)))
ans =
4
And it is even fully vectorized code, so you can check all of your values at once:
>> pow2(floor(log2([6,12])))
ans =
4 8
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Stephen23
Stephen23 2015-5-5
编辑：Stephen23 2015-5-5
Option Two (more robust):
[X,~] = log2(N);
if X==0.5
... code
else
... other code
end
Option Two (one line):
if rem(log2(N),1)==0
... code
else
... other code
end

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