how to plot two m.file in one plot

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br
br 2024-2-18
评论： br 2024-2-19
i have two PDE each one i calculated in m.file, but i want to draw the output of first one as x, and the second as y
how can i do that

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采纳的回答

Dyuman Joshi
Dyuman Joshi 2024-2-18
Call both the PDEs in a new script/function and plot accordingly.
  7 个评论
显示 5更早的评论
Torsten
Torsten 2024-2-18
Ran in:
Please include the complete code with error message that demonstrates the problem you have.
The functions you provided don't suffice and some are duplicates.
kp0=140270;
Eap=43900;
kd0=0.355;
Ead=17400;
T=333;
kp=kp0*exp(-Eap/(8.314*T));
kd=kd0*exp(-Ead/(8.314*T));
m=2;
t=linspace(0,3600,1000);
u=linspace(0.036405,111.3494528,1000);
x=linspace(0,0.036405,1000);
x1=pdepe(m,@(x,t,u,DuDx)eqn111(x,t,u,DuDx,T),@initial111,@(xl,ul,xr,ur,t)bc111(xl,ul,xr,ur,t,kp,kd),u,t);
u1=pdepe(m,@(x,t,u,DuDx)eqn11(x,t,u,DuDx,T),@initial11,@(xl,ul,xr,ur,t)bc11(xl,ul,xr,ur,t,kp,kd),x,t);
t_indices = find(t >= 0 & t <= 3600);
figure
hold on
for j = t_indices
plot(x1(j,:),u(j,:));
hold off
end
xlabel('radius');
ylabel('concentration');
function [c,f,s]=eqn111(x,t,u,DuDx,T)
c=1;
f=(1.34*10^-7)*exp(-16000/(8.314.*T))*exp(-(0.57*1.225+0.43*1.005*0.524)/(0.57*2.91*(-8.675+T)+0.43*0.5*(-205+T)))*DuDx;
s=0;
end
%----------------------------------------------------------------------------------------
function value=initial11(x)
value=0;
end
%-----------------------------------------------------------------------------
function [c,f,s]=eqn11(x,t,u,DuDx,T)
c=1;
f=(1.34*10^-6)*exp(-16000/(8.314.*T))*exp(-(0.57*1.225+0.43*1.005*0.524)/(0.57*2.91*(-8.675+T)+0.43*0.5*(-205+T)))*DuDx;
s=0;
end
%------------------------------------------------------------------------------
function value=initial11(u)
Function 'initial11' has already been declared within this scope.
value=0.036405;
end

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更多回答（1 个）

Sulaymon Eshkabilov
Ran in:
use plot(x, y), e.g.:
x = [-5:5;2*(-5:5); 3*(-5:5)];
y = [3*x.^2+3*x-3; -5*x.^2+5*x-15; -2*x.^2-3*x-13;];
plot(x(1,:),y(1,:), 'ro-', x(2,:),y(2,:), 'kp:', x(3,:),y(3,:), 'b--', 'LineWidth', 2)
grid on
xlabel ('x')
ylabel ("y(x)")
legend('Set 1', 'Set 2', 'Set 3', 'Location', 'Best')
  1 个评论
br
br 2024-2-18
thanks a lot, but each parameter x and u are in differant m.file how to combine them?

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