HP 42s Program Normal Distibution

[cylurian]

Thank you for your help with this code, Thomas. The program is now finalized and works on the DM42 to calculate the CDF of the Normal Distribution. By using the NCDF program (down below) in combination with the NPDF program (see below), you can calculate the CDF between two x-values. When running NCDF, it will prompt you to enter the mean, standard deviation, lower limit, and upper limit. The result offers an accuracy of approximately 10^-6. If you just want the PDF, then check out my last program pdf, it will ask you all the questions to find the PDF.

Code:


00 { 31-Byte Prgm }
01▸LBL "NPDF"
02 RCL "x"
03 RCL- "μ"
04 RCL÷ "s"
05 X↑2
06 -2
07 ÷
08 E↑X
09 RCL÷ "s"
10 2
11 PI
12 ×
13 SQRT
14 ÷
15 END

Code:


00 { 31-Byte Prgm }
01▸LBL "NPDF"
02 RCL "x"
03 RCL- "μ"
04 RCL÷ "s"
05 X↑2
06 -2
07 ÷
08 E↑X
09 RCL÷ "s"
10 2
11 PI
12 ×
13 SQRT
14 ÷
15 END

Code:


00 { 50-Byte Prgm }
01▸LBL "pdf"
02 MVAR "x"
03 MVAR "μ"
04 MVAR "s"
05 INPUT "x"
06 INPUT "μ"
07 INPUT "s"
08 RCL "x"
09 RCL- "μ"
10 RCL÷ "s"
11 X↑2
12 -2
13 ÷
14 E↑X
15 RCL÷ "s"
16 2
17 PI
18 ×
19 SQRT
20 ÷
21 END