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Math Help - Find back all additions.... Reverting Addition ?

  1. #1
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    Apr 2009
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    Find back all additions.... Reverting Addition ?

    I am trying to find a way to find all additions...

    lets say we start at the value 0.

    someome add +190 sec

    then add +260 sec

    then +2 760 sec

    then +17 205 sec

    then + 100 sec

    Would there be a way to revert changes by changes ?

    please note that at each iteration we should store always the same number of parameters.

    If we stored per example

    (START VALUE, SUM VALUE, LAST ADDITION #, X1, X2, X3,...,Xn?)
    0 , 20515, 100, X1, X2, X3,...,Xn?)
    With these values, find some math operations to revert to
    0 , 20415, 17 205, Y1, Y2, Y3,...,Yn?)
    With these values, find some math operations to revert to
    0 , 3 210, 2 760, Z1, Z2, Z3, ... , Zn?)
    ...
    ...
    and so on until
    0 , 0, 0, 0, 0, 0, ... , 0)
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  2. #2
    Newbie
    Joined
    Apr 2009
    Posts
    2

    my try... example 2

    an example I had try is the following :


    SUM LAST
    0 0 0 0
    180 180 0 0

    480 300 0.6 0.3750
    0.6 is gotten from 180/300+0(value from row before)
    0.3750 is gotten from 180/480+0(value from row before)

    1080 600 1.4 0.8194
    1.4 is gotten from 480/600+0.6(value from row before)
    0.8194 is gotten from 480/1080+0.3750(value from row before)

    in order to revert i would do...
    with :
    1080 600 1.4 0.8194

    the following maths
    1080 = 480

    abs(480/1080 - 0.8194) = 0.3750

    1.4 - (480/600 = 0.8) = 0.6

    480 - ( 480*0.3750 = 180 ) = 300

    this gives me

    480 300 0.6 0.3750

    then i do the same calculs as before...
    but if I ahd a 5th row it doesn't seems to works..
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