syms W w t x y
W=((exp((w*t)*i)-i^(sin(w*t)))/(260-00.3*w^2))*sin(x*pi/5)*sin(y*pi/5);
dx=diff(W,x);
dy=diff(W,y);
dt=diff(W,t);
dxy=diff(dx,y);
dxx=diff(dx,x);
dyy=diff(dy,y);
L=(dxx+dyy)*(dt)';
Ix=3.9*10^3*real(diff(L,x)+(dxx+0.2*dxy)*diff(dx,t)'+1.6*dxy*diff(dy,t)');
Iy=3.9*10^3*real(diff(L,y)+(dyy+0.2*dxy)*diff(dy,t)'+1.6*dxy*diff(dx,t)');
Txy=sqrt(Ix^2+Iy^2)
然后怎么对Ix,Iy,Ixy赋值呢