HP (Hewlett-Packard) 50g ユーザーズマニュアル

Page 21-15

In general, a program is any sequence of calculator instructions enclosed 
between the program containers   and ».  Subprograms can be included as 
part of a program.  The examples presented previously in this guide (e.g., in 
Chapters 3 and 8) 6 can be classified basically into two types: (a) programs 
generated by defining a function; and, (b) programs that simulate a sequence 
of stack operations.  These two types of programs are described next.  The 
general form of these programs is input

processoutput, therefore, we refer to 

them as sequential programs.

These are programs generated by using function DEFINE („à) with an 
argument of the form:

'function_name(x

1

, x

2

, …) = expression containing variables x

1

, x

2

, …'

The program is stored in a variable called function_name.  When the 
program is recalled to the stack, by  using ‚

function_name. The program 

shows up as follows: 

«

 x

1

, x

2

, … 'expression containing variables x

1

, x

2

, …'».

To evaluate the function for a set of input variables 

x

1

, x

2

, …

, in RPN mode, 

enter the variables into the stack in the appropriate order (i.e., 

x

1

 first, followed 

by

x

2

,

then

x

3

,

etc.), and press the soft menu key labeled 

function_name.  The 

calculator will return the value of the function 

function_name

(

x

1

, x

2

, …

).

Example: Manning’s equation for wide rectangular channel.
As an example, consider the following equation that calculates the unit 
discharge (discharge per unit width), q, in a wide rectangular open channel 
using Manning’s equation:

0

3

/

5

0

S

y

n

C

q

u

=