Hp 49g+ User Manual download pdf (Page 735)

100

101

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« Start program

DEG Select degrees for angular measures

0. 100. XRNG Set x range

0. 50. YRNG Set y range

ERASE Erase picture

(5., 2.5) (95., 47.5) BOX Draw box from (5,5) to (95,95)

(50., 50.) 10. 0. 360. ARC Draw a circle center (50,50), r =10.

(50., 50.) 12. –180. 180. ARC Draw a circle center (50,50), r= 12.

1 8 FOR j Draw 8 lines within the circle

(50., 50.) DUP Lines are centered as (50,50)

‘12*COS(45*(j-1))’ NUM Calculate x, other end at 50 + x

‘12*SIN(45*(j-1))’ NUM Calculates y, other end at 50 + y

R  C Convert x y to (x,y), complex num.

+ Add (50,50) to (x,y)

LINE Draw the line

NEXT End of FOR loop

{ } PVIEW Show picture

Example 2

- A program to plot a natural river cross-section

This application may be useful for determining area and wetted perimeters of

natural river cross-sections. Typically, a natural river cross section is surveyed

and a series of points, representing coordinates x and y with respect to an

arbitrary set of coordinates axes. These points can be plotted and a sketch of

the cross section produced for a given water surface elevation. The figure

below illustrate the terms presented in this paragraph.

The program, available in the diskette or CD ROM that comes with your

calculator, utilizes four sub-programs FRAME, DXBED, GTIFS, and INTRP. The

main program, called XSECT, takes as input a matrix of values of x and y,

and the elevation of the water surface Y (see figure above), in that order. The

program produces a graph of the cross section indicating the input data with

points in the graph, and shows the free surface in the cross-section.

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Hp 49g+ User Manual Page 735

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