Maths function

This is a discussion on Maths function within the C++ Programming forums, part of the General Programming Boards category; Hi guys, I have two points in space at: x,y,z & x1, y1,z1 and need to know how far apart ...

  1. #1
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    Maths function

    Hi guys,

    I have two points in space at: x,y,z & x1, y1,z1 and need to know how far apart they are from each other.

    I know I could work this out manually but I was wondering if there is an inbuilt function in c++ that will do this for me.

    Any ideas? I've tried to look in the doc but being fairly new not had any luck.

    Thanks

  2. #2
    Never Exist Hermitsky's Avatar
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    en ... .... .....
    i think there is not ........

    blow me ... ...

  3. #3
    S Sang-drax's Avatar
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    No, there's no built-in function for this.

    If you stretch it, you could use valarrays:
    Code:
    valarray<double> v  =  ... (x,y,z)
    valarray<double> u  = ... (x1,x2,x3) 
    
    //Distance vector between points
    valarray v0 = v-u;
    //Raise each element to the power of two, add the elements
    //and take the square root from the result
    double distance = sqrt( pow(v0,2).sum() );
    Even though abs() is overloaded for valarraysy, one cannot do:
    Code:
    double distance = abs(v0); //abs returns a valarray
    Last edited by Sang-drax; 09-24-2004 at 10:27 AM.
    Last edited by Sang-drax : Tomorrow at 02:21 AM. Reason: Time travelling

  4. #4
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    Thanks for that...

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