>> which dfield8 D:\Program Files\MATLAB\R2021b\toolbox\dfield8.m\dfield8.m
或者
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>> help pplane8 pplane8 is an interactive tool for studying planar autonomous systems of differential equations. When pplane8 is executed, a pplane8 Setup window is opened. The user may enter the differential equation and specify a display window using the interactive controls in the Setup window. Up to 4 parameters may also be specified. In addition the user is give a choice of the type of field displayed and the number of field points. When the Proceed button is pressed on the Setup window, the pplane8 Display window is opened, and a field of the type requested is displayed for the system. When the mouse button is depressed in the pplane8 Display window, the solution to the system with that initial condition is calculated and plotted. Other options are available in the menus. These are fairly self explanatory. This is the latest version that will run on MATLAB 9.0xxxxxxxxxx19 1D:\Program Files\MATLAB\R2021b\toolbox\dfield8.m\dfield8.m>> help pplane82 pplane8 is an interactive tool for studying planar autonomous systems of3 differential equations. When pplane8 is executed, a pplane8 Setup4 window is opened. The user may enter the differential5 equation and specify a display window using the interactive6 controls in the Setup window. Up to 4 parameters may also be 7 specified. In addition the user is give a choice of the type of 8 field displayed and the number of field points.9 10 When the Proceed button is pressed on the Setup window, the pplane811 Display window is opened, and a field of the type requested is 12 displayed for the system. When the mouse button is depressed in 13 the pplane8 Display window, the solution to the system with that14 initial condition is calculated and plotted.15 16 Other options are available in the menus. These are17 fairly self explanatory. 18 19 This is the latest version that will run on MATLAB 9.0
