Function 在Scilab函数中求解模型时，如何查看/提取模型流演化？
我编写了Lotka-Voterra模型（食饵-捕食者）作为Scilab函数，并用ODE解决了它。我的问题是我想看到流程的演变。我通过在解析中包含流找到了一个解决方案（在下面的脚本中只包含一个），但它确实“很重”。谁有更好的解决方案Function 在Scilab函数中求解模型时，如何查看/提取模型流演化？,function,modeling,ode,scilab,Function,Modeling,Ode,Scilab,我编写了Lotka-Voterra模型（食饵-捕食者）作为Scilab函数，并用ODE解决了它。我的问题是我想看到流程的演变。我通过在解析中包含流找到了一个解决方案（在下面的脚本中只包含一个），但它确实“很重”。谁有更好的解决方案 //parameters x=[0.04,0.005,0.3,0.2] n = x(1);//birth rate of prey c = x(2);//capture rate e = x(3);//energy from capture m = x(4);//de
//parameters
x=[0.04,0.005,0.3,0.2]
n = x(1);//birth rate of prey
c = x(2);//capture rate
e = x(3);//energy from capture
m = x(4);//death rate or predator
Tmax=100; // maximum time of simulation
dt=0.01; // step of time
t=0:dt:Tmax; //simulation time definition
Ci = [20,30,0]'; //initial conditions (including for 1 flow)
//Lotka Volterra model
function [dy]=LV(t, y, n, c, e, m)
GrowthP = n * y(1)
IngestC = c * y(1) * y(2)
MortC = m * y(2)
dy(1) = GrowthP - IngestC
dy(2) = IngestC * e - MortC
dy(3) = IngestC //here one flow in ode
endfunction
//resolution
sol=ode(Ci,0,t,LV)
//dataframe creation to stock data
soldef=zeros(3,10001);
//for the line 3 and form 2 to the last data it take the value,
//remove the one of the previous time step and store it in soldef
for i = 2:length(sol(3,:))
soldef(3,i)=sol(3,i)-sol(3,i-1);
end
//complete the dataframe with the stock
soldef(1:2,:)=sol(1:2,:)
感谢您对我的问题的兴趣和时间（对不起我的英语）如果您想要动画显示结果，您可以使用下面的代码在图形上绘制越来越多的数据：
[row,col]=size(soldef);
scf(0);
clf(0);
plot2d(soldef(:,1:2)',rect=[0,0,col,max(soldef)]); //plot first 2 points
en=gce(); //handle of the graphic entities
for i=3:col //plot more and more points
en.children(1).data=[1:i;soldef(3,1:i)]'; //update data matrices
en.children(2).data=[1:i;soldef(2,1:i)]';
en.children(3).data=[1:i;soldef(1,1:i)]';
//you can save the frames here...
xpause(1e4); //wait some time if amination is too fast
end
xs2gif（）