Физика /
a=1.1; b=1.8; d=2.5; l=2; h=0.05;
s=0.16666;
n=1/h+1;
x=0:h:1;
c1=(4/l^2)*(-d+(a+b)/2);
c2=(2/l)*(2*d-(3*a+b)/2);
u=c1*x.^2+c2*x+a*ones(1,n);
v=u;
u0=u;
m=25;
for j=1:m,
for i=2:(n-1),
v(i)=u(i)+s*(u(i-1)-2*u(i)+u(i+1));
end;
u=v;
end;
u1=u;
for j=1:125,
for i=2:(n-1),
v(i)=u(i)+s*(u(i-1)-2*u(i)+u(i+1));
end;
u=v;
end;
u2=u;
for j=1:100,
for i=2:(n-1),
v(i)=u(i)+s*(u(i-1)-2*u(i)+u(i+1));
end;
u=v;
end;
u3=u;
for j=1:250,
for i=2:(n-1),
v(i)=u(i)+s*(u(i-1)-2*u(i)+u(i+1));
end;
u=v;
end;
u4=u;
plot(x,u0,x,u1,x,u3,x,u4)
grid
prtsc
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