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1、数学模型作业姓名：学号：班级：实验报告193.食饵——捕食者模型程序：functionxdot=shier(t,x)r=1;d=0.5;a=0.1;b=0.02;xdot=[(r-a*x(2)).*x(1);(-d+b*x(1)).*x(2)];ts=0:0.1:15;x0=[25,2];[t,x]=ode45('shier',ts,x0);[t,x],plot(t,x),grid,gtext('x(t)'),gtext('y(t)'),pause,plot(x(:,1),x(:,2)),gridans=025
2、.00002.00000.100027.08182.00410.200029.33442.01700.300031.76892.03940.400034.39612.07260.500037.22582.11780.600040.26732.17670.700043.50122.25340.800046.93602.35030.900050.60722.46831.000054.53012.61061.100058.69992.78191.200063.09172.98911.300067.66043.2411
3、1.400072.34093.54841.500077.04793.92381.600081.67594.38191.700086.09964.93911.800090.17325.61401.900093.73116.42682.000096.58737.40002.100098.53608.55772.200099.30559.92342.300098.614311.50852.400096.285113.30672.500092.247215.28822.600086.585317.39472.70007
4、9.534919.54272.800071.536421.62252.900063.084823.53003.000054.623625.18193.100046.544126.51633.200039.186027.49213.300032.793228.09783.400027.336828.37663.500022.737528.37643.600018.913428.14263.700015.777127.71783.800013.235427.14263.900011.187326.45564.000
5、09.527825.69114.10008.175824.87404.20007.068424.02454.30006.159223.15804.40005.418522.28534.50004.812921.41624.60004.312420.55824.70003.896719.71644.80003.550018.89484.90003.260118.09615.00003.018117.32195.10002.815416.57355.20002.646015.85155.30002.504715.1
6、5625.40002.387214.48755.50002.289813.84545.60002.209913.22955.70002.145512.63935.80002.095312.07405.90002.057811.53306.00002.031711.01546.10002.016210.52076.20002.010610.04796.30002.01439.59646.40002.02709.16536.50002.04838.75396.60002.07818.36146.70002.1164
7、7.98706.80002.16327.63006.90002.21887.28977.00002.28336.96547.10002.35736.65657.20002.44106.36227.30002.53516.08217.40002.64015.81557.50002.75665.56187.60002.88555.32047.70003.02765.09107.80003.18374.87297.90003.35494.66568.00003.54244.46888.10003.74784.2819
8、8.20003.97234.10468.30004.21743.93658.40004.48473.77738.50004.77613.62658.60005.09373.48388.70005.43983.34908.80005.81713.22178.90006.22833.10179.00006.67662.98889.10007.16532.88269.20007.69782.
