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Hi,

I have solved a 2D time problem U(x,y,t), 0<=x,y<=L and 0<=t<=T, by FEM and i get

trisurf(TRI,x,y,U(:,N)) % N number of time steps

% TRI triangle for create mesh

My question is how to write Matab code to see plot 1D for U solution of this problem if I choose for example : U(5,6,t) for all 0<=t<=T and U(x,5,0.15) for 0<=x<=L.

(To simulate 1D problem through a 2D problem ) this what i try write plot but it is not correct

% plot of time : U(5,6,t)

t=linspace(0,2,0.15);

for i=1:np % np number of nodes

find(x(m)==5 & y(m)==6)

end

plot(t,U(:,t))

%%%%%%%%%%%%%

% plot of x : U(x,5,0.15)

t=0.15;

for i=1:np % np numbers of nodes

find(y(m)==5

end

plot(x,U(:,t)

Please i need help

Thanks

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