Change of number over time

is there any standard FM to calculate change of number over time .
where Z is my number.i have to find change of Z over a time period.
i.e I have to find dZ.
Any idea.
Thanks in advance.
Message was edited by:
        Maya Vinothini

Do u mean the differenciation operation??
if yes try to do this way.
do 10000 times.
calculate the change over the dependent variable in small intervals.
of  independent variable.
dz = dz+ (d2-d1 )    " accumulate values
enddo.
dz = dz/10000.  " divide by the number of times.

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