The deal with using 4d arrays :D

This is a discussion on The deal with using 4d arrays :D within the C++ Programming forums, part of the General Programming Boards category; Well I just learned something in the past week, when you have a 4d array, such as s[3].[3][14][28] and try ...

  1. #1
    Absent Minded Programmer
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    What not to do with arrays :)

    Well I just learned something in the past week, when you have a 4d array, such as

    s[3].[3][14][28]

    and try to loop it as such

    Code:
    for(a; a<3; a++)
    {
    for(b; b<3; b++)
    {
    for(c; c<14; c++)
    {
    for(d; d<28; d++)
    {
    s[a].[b][c][d].sold = false
    }
    }
    }
    }
    Hehe...... yeah, right there is about 10,000 mathematical operations...

    Note to all who may be tempted, don't do this
    Last edited by Shamino; 11-03-2005 at 11:13 PM.

  2. #2
    vae victus! skorman00's Avatar
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    To be exact

    3528 assignments with the array.
    3666 ++ operations.
    Last edited by skorman00; 11-03-2005 at 09:05 PM.

  3. #3
    Absent Minded Programmer
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    considering it takes

    column*row+1....... to move through a 2 dimensional matrix.. a 4d one has even more

    multiply it by about 3-5 again
    Last edited by Shamino; 11-03-2005 at 09:06 PM.

  4. #4
    vae victus! skorman00's Avatar
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    ooo, didn't think about that Shamino. Good call.

  5. #5
    Absent Minded Programmer
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    you can thank Bubba for this bit of knowledge :d

  6. #6
    Absent Minded Programmer
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    my program was doing anywhere between 200,000-400,000 mathematical operations per frame, no wonder it got about 5 fps :\

  7. #7
    Computer guy
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    that is for low graphic card or low processor, with high graphic card and high speed processor, these calculations are not big of a deal
    Hello, testing testing. Everthing is running perfectly...for now

  8. #8
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    we have a beastly processor... 2.4 gigahurts, it still runs at 5 or so fps...

    oddly enough, at home my p3 dual 400 mhz runs its perfectly smooth, strange..

  9. #9
    VA National Guard The Brain's Avatar
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    i think the more important question is.. who the heck needs a 4 dimensional array..?!?
    • "Problem Solving C++, The Object of Programming" -Walter Savitch
    • "Data Structures and Other Objects using C++" -Walter Savitch
    • "Assembly Language for Intel-Based Computers" -Kip Irvine
    • "Programming Windows, 5th edition" -Charles Petzold
    • "Visual C++ MFC Programming by Example" -John E. Swanke
    • "Network Programming Windows" -Jones/Ohlund
    • "Sams Teach Yourself Game Programming in 24 Hours" -Michael Morrison
    • "Mathmatics for 3D Game Programming & Computer Graphics" -Eric Lengyel

  10. #10
    Super Moderator VirtualAce's Avatar
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    that is for low graphic card or low processor, with high graphic
    card and high speed processor, these calculations are not big of a deal
    You are wrong.

    Wasting cycles is still wasting cycles even on a super-computer. And so far you haven't shown me any code that is being processed by the graphics card so it has no relevance as of yet.

    And if it is not a big deal, then why is your code running so slow?

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