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You can also
recalculate by
clickingon the
calculatebutton
from the Basic
Functionstoolbar.
N
l_ To turn automatic
recalculation
on or off:
1. Select
Calculation
from
the Options
menu.
A dialog
box appears.
2. Select
Automatic
or Manual
to specify
the type of calculation
you want.
3. Click on OK.
4. Click on Close.
!_ To recalculate
manually:
Select Calculate Now from the Options menu.
Using Iteration and Circular References
Occasionally,
you may want
to create
a formula
in which
the calculation
uses
the result of the calculation.
This is called
a arcular
referem_.
For
example,
to calculate
gross
profit,
subtract
expenses
from income.
If one
of
the expenses
is based
on a percentage
of the profit,
for example,
commission
payments,
the formula
has to rely on the outcome
of the calculation.
If you calculate
this formula
more
than once,
each successive
calculation
results
in a smaller
value.
Thisis
called/let-at/on.
Iteration
is the process
of
recalc_l_iting
a_cifculffr-_ference
repeatedly,
until the values
converge',
which
means
that the difference
in the result of each successive
calculation
is no
longer
significant.
Before
using
circular
references,
turn on iteration
using Calculation
from
the
Options
menu.
If you enter
a formula
with a circular
reference
but do not
specify
iteration,
#CIRC#
appears
in the cell.
_ To use iteration:
m mm_ _
1. Select
Calculation
from
the Options
menu.
The dialog
box at the left
appears.
2. Fill in the dialog
box, specifying
the options
you want.
•
Allow
Iterations.
Select
the Allow Iteration
option
ff you are going
to use iteration
in your.spreadsheet.
• •
Maximum
Iterations.
Enter the maximum
number
of iterations
you
want.
•
Maximum
Change.
Enter the maximum
change
you want
to allow.
If you enter
zero,
iteration
will not stop
until it converges
or reaches
the maximum
number
of iterations.
Spreadsheet
101
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