Texas Instruments TI-89 Titanium Short User Manual page 223

expression1
part(
Simplifies
or operand, where
top-level arguments or operands returned by
expression1
part(
By combining the variations of
extract all of the sub-expressions in the simplified
result of
the right, you can store an argument or operand
and then use
expressions.
Note: When using
particular order in sums and products.
Expressions such as (x+y+z) and (xì yì z) are
represented internally as (x+y)+z and (xì y)ì z.
This affects the values returned for the first and
second argument. There are technical reasons
why
part(
Similarly, xù yù z is represented internally as
(xù y)ù z. Again, there are technical reasons why
the first argument is returned as yøx instead of
xøy.
When you extract sub-expressions from a matrix,
remember that matrices are stored as lists of lists,
as illustrated in the example to the right.
Appendix A: Functions and Instructions
) ⇒
n expression
,
and returns the
expression1
is > 0 and the number of
n
. Otherwise, an error is returned.
)
part()
. As shown in the example to
expression1
to extract further sub-
part()
, do not rely on any
part()
x+y+z,1 returns y+x instead of x+y.
)
part(cos(pù x+3),1) ¸
argument
n
th
Note: Simplification changed the order of the
argument.
, you can
part(cos(pù x+3)) ¸
part(cos(pù x+3),0) ¸
part(cos(pù x+3),1)! temp ¸
temp ¸
part(temp,0) ¸
part(temp) ¸
part(temp,2) ¸
part(temp,1)! temp ¸
part(temp,0) ¸
part(temp) ¸
part(temp,1) ¸
part(temp,2) ¸
part(x+y+z) ¸
part(x+y+z,2) ¸
part(x+y+z,1) ¸
part(xù yù z) ¸
part(xù yù z,2) ¸
part(xù yù z,1) ¸
part([a,b,c;x,y,z],0) ¸ "{"
part([a,b,c;x,y,z]) ¸
part([a,b,c;x,y,z],2)! temp
¸
part(temp,0) ¸
part(temp) ¸
part(temp,3) ¸
delVar temp ¸
3+pøx
1
"cos"
3+pøx
pøx+3
"+"
2
3
pøx
"ù "
2
p
x
2
z
y+x
2
z
yøx
2
{x y z}
"{"
3
z
Done
217