www.gusucode.com > symbolic 源码程序 matlab案例代码 > symbolic/ConvertDAESystemToAFunctionHandleExample.m
%% Convert DAE System to a Function Handle %% 1 % Copyright 2015 The MathWorks, Inc. syms x1(t) x2(t) a b r(t) eqs = [diff(x1(t),t) == a*x1(t) + b*x2(t)^2,... x1(t)^2 + x2(t)^2 == r(t)^2]; vars = [x1(t), x2(t)]; %% 2 f = daeFunction(eqs, vars, a, b, r(t)) %% 3 a = -0.6; b = -0.1; r = @(t) cos(t)/(1 + t^2); F = @(t, Y, YP) f(t,Y,YP,a,b,r(t)); %% 4 t0 = 0; y0 = [-r(t0)*sin(0.1); r(t0)*cos(0.1)]; yp0 = [a*y0(1) + b*y0(2)^2; 1.234]; %% 5 ode15i(F, [t0, 1], y0, yp0)