df - Direction Fields -dfield6 • The routine dfield6 is...

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Unformatted text preview: Direction Fields -dfield6 • The routine dfield6 is already loaded on all PUCC machines as standard software. To access it from any PUCC machine: Start→All Programs→Standard Software→Computational Packages→MATLAB6.1→MATLAB6.1 If you are using your own copy of Matlab you may need to download dfield6. Here is a link : http://math.rice.edu/∼dfield/ (Note: dfield and dfield5 are older versions of dfield6.) • To access dfield6, at a Matlab prompt type: dfield6 • A popup window will appear: • Correctly enter your differential equation and enter the range of values of the independent and dependent variables. Hit Proceed and a graphics window will appear with the direction field of your differential equation. Click the mouse at any point and the corresponding solution curve through that point will be plotted. • There are several options available in the graphics display window : printing, keyboard input of initial conditions, inserting text, erasing solutions, zoom, etc. • You may have up to two parameters to quickly vary your differential equation (rather than retyping the whole differential equation with a different constant). For example, if you wanted to see the slope fields for y = At + By 2 for the values A = 0, 1, 2 and B = −0.1, 0.0, 0.1, you only need to type in one equation and simply vary the parameters A and B in the indicated boxes. ...
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