~~NOTOC~~
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====== log ======
log(<-value <-base)

===== Description =====
Allows the performance of arbitrary based logarithms. See examples. On zero, returns -inf. Below zero, returns NaN, a special value that always causes failure when compared to other numbers. Eg. (NaN<0) -> false, (Nan>=0) -> false

other logarithms 
<WRAP Indent>
log(x,10) = log10(x) \\
log(x,e) = ln(x)
</WRAP>

===== Examples =====
<code 4rpl>
trace(log(2 .5))   #prints '-1'
trace(log(.25 .5)) #prints '2'
</code>
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