HP 42S/DM 42/Free42:
Function Table
Introduction
The program FTAB uses
the function defined in FX, with variable “X” to generate a 2
column matrix of f(X). The matrix is stored in variable MATS. The
program ends with MATS in edit mode, so you see all the points
generated. Use the soft key [ → ] to view the entries.
Setting up FX
To set up the function
FX, the program needs to be in the following format:
00
{nnn-Byte Prgm}
01
LBL “FX”
02
MVAR “X”
03
f(X) starts here, use RCL “X” for X
…
nn-1
RTN
nn
END
HP
42S Program FTAB
HP 42S, DM 42, Free42
00
{ 99-Byte Prgm }
01▸LBL
"FTAB"
02
"X Start:"
03
PROMPT
04
STO 01
05
"X Step:"
06
PROMPT
07
STO 02
08
"# Steps:"
09
PROMPT
10
STO 03
11
1
12
-
13
1ᴇ3
14
÷
15
STO 04
16
RCL 03
17
2
18
DIM "MATF"
19
INDEX "MATF"
20▸LBL
00
21
RCL 01
22
RCL 04
23
IP
24
RCL× 02
25
+
26
STO "X"
27
STOEL
28
J+
29
XEQ "FX"
30
STOEL
31
J-
32
I+
33
ISG 04
34
GTO 00
35
EDITN "MATF"
36
.END.
Example
f(x) = x^2 * e^x
FX:
00
{ 18-Byte Prgm }
01▸LBL
"FX"
02
MVAR "X"
03
RCL "X"
04
ENTER
05
X↑2
06
X<>Y
07
E↑X
08
×
09
RTN
10
.END.
Input:
X Start: 0
X Step: 0.1
# Steps: 10
Result Matrix MATS:
MATF=
[ 10x2 Matrix ]
1:1=
0.0000
1:2=
0.0000
2:1=
0.1000
2:2=
0.0111
3:1=
0.2000
3:2=
0.0489
4:1=
0.3000
4:2=
0.1215
5:1=
0.4000
5:2=
0.2387
6:1=
0.5000
6:2=
0.4122
7:1=
0.6000
7:2=
0.6560
8:1=
0.7000
8:2=
0.9867
9:1=
0.8000
9:2=
1.4243
10:1=
0.9000
10:2=
1.9923
Matrix (row:column)
Eddie
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original content copyright, © 2011-2019. Edward Shore.
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