Investigate the qualitative behavior of a nonlinear system of differential equations

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

Answers (1)

Roger Stafford
Roger Stafford on 29 Jul 2015
The matlab function 'ode45' is your friend. Read about it at:
http://www.mathworks.com/help/matlab/ref/ode45.html
  1 Comment
Sam
Sam on 29 Jul 2015
Edited: Sam on 29 Jul 2015
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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