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Sumnring Operations With
STAT
Lists
The
stored
in
STAI lists.
TWo
Solver functions
allow you to
access
that
data.
I
SIZES(list
name)
returns the number of
items
in
the
specified
list.
I
I
T
E
Yl
(list name
z
item
number
j
returns the value
of
the
specified
item.
For
example,
the following equation
calculates
2x12y]
for two
lists
named XVAR
and
WAR
that
have
the
same
number
of
items:
SH2YZ=E(
I
: 1r
SIZES(HVHR)
I
1: ITEl'l(HUHR: I
)^2x
ITEI',I(YUHR:
I
)^2)
"Calculating Subtotals' on
page 186
illustrates another application
of
the
How
the
Solver
Works
Dirgct and lterative
Solutions
When you start
a
calculation, the
Solver
attempts
to find
a direcf
solution
by
algebraically
rearranging the equation
to
isolate
the
unknovtm.
If
a
di-
rect
solution is found, the HP-275
displays
the
answer
with no
other
information.
For
example,
to
solve:
t]
I
STHNCE=UBxT
I
l,lE_,
SxGxT I I,lE^a
for
V0, the
Solver
internally
rearranges
the
equation
to
isolate
V0:
v0
:
(DlsTANcE
+
.5
x
G
x
TIME^2)
+
TIME
-
I
I
O
5: The Equation
Solver
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