HP 10413 Datasheet download pdf (Page 221)

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The final option is ‘Show function’. The program this runs is a little more

complex than the ones shown so far and illustrates a useful technique.

The line: '((X+2)^3+4)/(X-2)' F1(X):

stores the expression

()

−

into the function F1(X).

Notice the way the function is in single quotes so that the algebraic

expression itself is used rather than its value when evaluated using the

current contents of memory X. If you wanted to graph this function by setting

the post execution view number to 1 (the PLOT view), then you would need to

include the command CHECK 1: in order to it or it would not graph.

You may wish to edit the .MSG.SV and.MSG.FN program to try this.

The next lines display the expression using the four options available.

The line: GROB G1;F1(QUOTE(X));0:

converts the expression F1(X) into a Graphic Object (GROB). The number at

the end, which changes with each repetition, controls the font used to display

the function.

The line:

DISPLAY G1:

displays this GROB on the screen, and the FREEZE command freezes the

display until a key is pressed.

Finally the LINE and BOX commands commands are used to draw an oblique

line across the screen and a box near the center. Notice the use of Xmin,

Xmax, Ymin and Ymax in the LINE command. This means that the line

would appear the same even if the screen were to be re-sized in the PLOT

SETUP view. The FREEZE command is needed to ensure that your screen is

visible to the user and not immediately replaced by the next view.

Note that SETVIEWS has a “Start” option and also a final option consisting of

a single space in quotes which is simply to link in the .MSG.SV program so

that it is transmitted with the aplet. It does not appear on the menu.

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HP 10413 Datasheet Page 221