HP 50G, User Manual

Page: 661 / 887

Page 21-14
functions from the MTH menu. Specifically, you can use functions for list
operations such as SORT,
Σ
LIST, etc., available through the MTH/LIST menu.
As additional programming exercises, and to try the keystroke sequences listed
above, we present herein three programs for creating or manipulating lists. The
program names and listings are as follows:
LISC :
«
→
n x
«
1 n FOR j x NEXT n LIST
» »
CRLST :
«
→
st en df
«
st en FOR j j df STEP en st - df / FLOOR 1 +
→
LIST
» »
CLIST :
«
REVLIST DUP DUP SIZE 'n' STO
Σ
LIST SWAP TAIL DUP SIZE 1 - 1
SWAP FOR j DUP
Σ
LIST SWAP TAIL NEXT 1 GET n LIST REVLIST 'n'
PURGE
»
The operation of these programs is as follows:
(1) LISC : creates a list of n elements all equals to a constant c.
Operation : enter n, enter c, press
@LISC
Example : 5
`
6.5
`
@LISC
creates the list: {6.5 6.5 6.5 6.5 6.5}
(2) CRLST : creates a list of numbers from n
1
to n
2
with increment
Δ
n, i.e.,
{n
1
, n
1
+
Δ
n, n1+2
⋅Δ
n, … n
1
+N
⋅Δ
n }, where N=floor((n
2
-n
1
)/
Δ
n)+1.
Operation : enter n
1
, enter n
2
, enter
Δ
n, press
@CRLST
Example : .5
`
3.5
`
.5
`
@CRLST
produces: {0.5 1 1.5 2 2.5 3 3.5}
(3) CLIST : creates a list with cumulative sums of the elements, i.e., if the original
list is {x
1
x
2
x
3
… x
N
}, then CLIST creates the list:
Operation : place the original list in level 1, press
@CLIST
.
Example : {1 2 3 4 5}
`
@CLIST
produces {1 3 6 10 15}.
} ,..., , , {
1
3 2 1 2 1 1
∑
=
+ + +
N
i
i
x x x x x x x