Investigate the qualitative behavior of a nonlinear system of differential equations

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Sam 2015-7-29

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https://ww2.mathworks.cn/matlabcentral/answers/231582-investigate-the-qualitative-behavior-of-a-nonlinear-system-of-differential-equations

编辑： Sam 2015-7-29

ma266-proj3-f10.pdf

would someone be able to help me with the code format for this problem?

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Answer 1

Roger Stafford 2015-7-29

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https://ww2.mathworks.cn/matlabcentral/answers/231582-investigate-the-qualitative-behavior-of-a-nonlinear-system-of-differential-equations#answer_187545

在 MATLAB Online 中打开

The matlab function 'ode45' is your friend. Read about it at:

http://www.mathworks.com/help/matlab/ref/ode45.html

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Sam 2015-7-29

编辑：Sam 2015-7-29

I have to use pplane8.. I used it and got this graph after inputting the initial conditions. the first question I have to answer is .. As t increases, describe what happens to each population. Is the aphid population ever smaller than 300, 000? Are the aphids ever eradicated? Does the ladybug population ever exceed 2 million?

because its y vs x , and I know these are functions of t but how would I find the answers to these questions? How do I read the graph

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