Given a number n and a base B greater than 1, return the lowest integer power of B that is less than or equal to n.
Example:
B = 4;
n = 53;
npb = lastpowb(B,n);outputs
npb = 2
See also: nextpow2, nextpowb
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http://www.mathworks.com/matlabcentral/cody/problems/1070-next-higher-power-of-b