Drawing a logarithmic histogram

[Andre]

Hi,

I'm trying to plot a histogram on some data that I receive at runtime.
I'm trying to measure distances between two points, and these distances
can be from the range 1 to 5000000. I want to use a logarithmic scale
with a range -2^29 to +2^29. How can I determine at any point in time
which strata (i.e which cohort or portion of scale) the value belongs to
(without using the square or square-root functions)?

I could have mask-bits of all possible scales, such as 2^2, 2^3, 2^4
upto 2^29 and AND each of these with the value to figure this out but is
there a cleaner way of doing this?

Thanks a lot.

--Andre

[Glen Herrmannsfeldt]

"Andre" <fo********@hotmail.com> wrote in message
news:3F**************@hotmail.com...

I'm trying to plot a histogram on some data that I receive at runtime.
I'm trying to measure distances between two points, and these distances
can be from the range 1 to 5000000. I want to use a logarithmic scale
with a range -2^29 to +2^29. How can I determine at any point in time
which strata (i.e which cohort or portion of scale) the value belongs to
(without using the square or square-root functions)?

Log graphs will not have negative numbers in the range ( or is it domain?).

Maybe you meant 2**(-29). (Note that the ^ operator has a different meaning
in C.)

I would think that log() would be useful. If more than one dimension, you
would also want sqrt().

-- glen