Diff Eqs with the 89 - Differential Equations on the TI-89...

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Differential Equations on the TI-89 Change mode from 1: Function to 6: Diff Equations Go to the y= editor and press [Diamond/Yellow] and [|] Make sure “Solution Method” is Euler Make sure “Fields” is SLFLD Go to the y= editor and enter your derivative In y1’: Use [t] instead of [x] and use [y]1 (type y and a 1) instead of [y] In y2’: Use [t] instead of [x] and use [y]2 (type y and a 2) instead of [y] Drawing a solution curve through an initial condition: Set “t0” equal to the x (or t) coordinate of the initial condition
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Unformatted text preview: • Set “yi1” equal to the y coordinate of the initial condition Using Euler’s Method: • Set up the y= editor the same way as for the solution curve method (we’re actually using Euler’s Method to draw the solution curve) • In the Window screen set t0 equal to the initial x value (tmax doesn’t really matter so long as it is larger than the x value of the point on the curve you are trying to approximate) • Set the tstep equal to the step size • Graph and trace. The calculator tells you tc, xc, and yc....
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