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 | | "Local Positioning System" for lego-vehicles with mice
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| Hello NG, i try to develop something like a local position system with a optical RF mouse (or other mouse-devices). If someone want to join or help for this little project please mail me. A very first result you can see at (URL) (23 years ago, 1-Feb-02, to lugnet.robotics.rcx.legos)
| | | | | Integer-based arctangent2 function for anyone interested
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| After scouring the internet for several days and even utilizing Jack Crenshaw's wonderful book "Math Toolkit for Real-time Programming", I was unable to find a good, general iatan2(y,x) function. Note that this is the atan function that takes as (...) (23 years ago, 31-Jan-02, to lugnet.robotics.rcx.legos)
| | | | | Errors compiling egcs
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| Hi, I've just downloaded and attempted to install the binutils, egcs, and LegOs on my computer as per the instructions at (URL) only difference between these instructions and what I have done is the path to where the software is to be installed. (...) (23 years ago, 31-Jan-02, to lugnet.robotics.rcx.legos)
| | | | | Re: which Linux distro?
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| (...) Good Idea ! I had no problem using legOS when using a RedHat 7.1, Mandrake8 or a Conectiva 6.0, As far as I remember, there is a Debian package available for legOS. So... no matter which distribution you'll use, it will be far better than (...) (23 years ago, 31-Jan-02, to lugnet.robotics.rcx.legos)
| | | | | which Linux distro?
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| Hi, I am thinking of moving over to Linux, partly for legOS reasons (Lnp easier to set up for a start), but partly for other reasons (free software, morality etc, ie the usual waffle.) I am considering Redhat 7.2, Suse 7.3 personal or Suse 7.3 (...) (23 years ago, 31-Jan-02, to lugnet.robotics.rcx.legos)
| | | | | Re: Incorrect result
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| (...) Yes, this is what happens when one is used to just making everything long and not considering overflows. Even worse was that I was doing the math on the computer's calculator, but not looking at the intermediate result, just typing in the (...) (23 years ago, 30-Jan-02, to lugnet.robotics.rcx.legos)
| | | | | Re: Incorrect result
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| (...) 256 * 128 = 32768, one higher as the biggest positive integer value. The cast to long would help, but your cast is too late. I have not tested, but I think rc += ( (long)b->magnitude * (long)TA_costable[...] ) >> 7; will help. Try output in (...) (23 years ago, 30-Jan-02, to lugnet.robotics.rcx.legos)
| | | | | RE: Incorrect result
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| <snipped code> (...) Robert, this is a classic problem with ranges of singed numbers in C rx = (long)(a->magnitude * TA_costable[a->direction]) >> 7; I don't have an RCX in frot of me, but I think you need to cast a->magnitude to long before the (...) (23 years ago, 30-Jan-02, to lugnet.robotics.rcx.legos)
| | | | | Incorrect result
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| This problem, unlike the other, is definitely not a result of my eyes/brain being tired or something. I thoroughly displayed every value before and after evaluation and the result is ***WRONG***. Here is the code and the values: typedef struct { int (...) (23 years ago, 30-Jan-02, to lugnet.robotics.rcx.legos)
| | | | | RE: true tcp/ip on the RCX
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| Hi :) Just out of curiosity, check this thread from Jan/2000: (URL) mc. (...) (23 years ago, 30-Jan-02, to lugnet.robotics.rcx.legos)
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