Texas Instruments TI-89 Voyage 200, Руководство пользователя

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Differential Equation Graphing 415
Important:
The Fields graph format is critical in successfully graphing differential
equations.
Note:
If you press
¸
while a slope or direction field is being drawn, the graph pauses
after the field is drawn but before the solutions are plotted. Press
¸
gain to continue.
To cancel graphing, press
´
.
Setting Axes Setting Axes Setting Axes Setting Axes
In the Y= Editor,
Axes
may or may not be available, depending on the current graph
format.
Fields Specifies whether to draw a field for the differential
equation.
• SLPFLD — Draws a slope field for only one 1st-order
equation, with t on the x axis and the solution on the y
axis.
• DIRFLD — Draws a direction field for only one 2nd-
order equation (or system of two 1st-order equations),
with axes determined by the custom axes settings.
• FLDOFF — Does not display a field. This is valid for
equations of any order, but you must use it for 3rd- or
higher-order. You must enter the same number of initial
conditions for all equations in the Y= Editor.
If it is available, you can select the axes that
are used to graph the differential equations.
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Graph format Description