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you know i was looking at lejos, java for RCX, and it seems to have
exponents, trig, etc. functions built in. any advantages legOS has over
lejos i don't know about. if not, i think i may give it a whirl....
-dave
In lugnet.robotics.rcx.legos, Tom Oldfield writes:
> Dave
>
> I am working on a number of maths functions that includes
> loge log10 expe and exp10 x^y as well as trig functions. As
> you note it requires the specification of the mantassa and exponent
> desciption of the float variable for the RCX. Usually this is
> done in most maths libraries by splitting a variable using a union
> desciption (float -> union { float y; unsigned short bit[2]; }) - this
> needs the endian encoding for the RCX.
> I am conducting some tests but I get little more than a couple of
> minutes/week to work on this. In particular many maths functions
> require the function x*2^n, and most current maths libraries are
> at very least double/quad precision so conversion needs some thought.
>
> Regards
>
> tom
>
>
> In lugnet.robotics.rcx.legos, David Dubravetz writes:
> > hello,
> > i've searched through the discussions but i haven't been able to find any
> > info on using floats with exponents in legOS, specifically the inverse of
> > natural log: e^. actually, i can't find any info about integers with
> > exponents either. i am programming a backprop neural net to run on the RCX
> > that uses a sigmoid activation function: (1/(1 + e^(-D*net))). i've seen a
> > few posts on trig functions, but i really would prefer exponents if possible.
> > any suggestions/help would be appreciated.
> > thanks,
> > dave
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Message has 1 Reply:
 | | Re: exponents, e^
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| (...) Only one I can think of off-hand is support for the remote control, I've been thinking about looking at that if I can get some time (though it's still only a patch in legOS, have to do something about that, too). There may be others I don't (...) (25 years ago, 6-Mar-02, to lugnet.robotics.rcx.legos)
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Message is in Reply To:
| | Re: exponents, e^
|
| Dave I am working on a number of maths functions that includes loge log10 expe and exp10 x^y as well as trig functions. As you note it requires the specification of the mantassa and exponent desciption of the float variable for the RCX. Usually this (...) (25 years ago, 6-Mar-02, to lugnet.robotics.rcx.legos)
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