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[resolved] Can't make mathematical form work (3 posts)

  1. OliverEggertsen
    Member
    Posted 10 months ago #

    Hi.

    I am having a problem with making my mathematical formula "work".

    I am making a formula of a simple future value calculation.

    The formula is: Present value * (1 + interest/100)^number of time periods.

    I have entered this formula in my calculated field:
    PREC(POW(fieldname4*(1+fieldname2/100),fieldname3),2)

    Fieldname 4 is present value
    Fieldname 2 is interest
    Fieldname 3 is number of time periods

    If i for example enter 100 in present value, 2 in interest, and 20 in time periods i get a huge number compared to the real answer which should be 148.59

    https://wordpress.org/plugins/calculated-fields-form/

  2. codepeople
    Member
    Plugin Author

    Posted 10 months ago #

    Hi,

    Please, replaces the fields names, by the initial numbers in your current equation:

    If the present value is 100, and the interes is 2, and the number of time periods is 20, your equation would be:

    PREC(POW(100*(1+2/100),20),2) = PREC(POW(102,20),2)

    and

    102^20 = 1.4859473959783544e+40

    PREC(POW(1.4859473959783544e+40),2) = 1.4859473959783544e+40

    So, if you're obtaining a huge number as equation's result with the initial values you sent me, the equation is working fine.

    Now, if you modify the equation like follow:

    PREC(fieldname4*POW((1+fieldname2/100),fieldname3),2)

    you will get the result you want ;-)

    Remember, you should create the equations maintaining the priorities between the operations of the Mathematical world.

    Best regards.

  3. OliverEggertsen
    Member
    Posted 10 months ago #

    Thanks :-)

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