MATLAB: Concentration with respect to time at different temperature

c vs t

Hey,

I want to merge these two plots on same graphs to visualise nature clearly.

Thank you in advance.

See the attachments for my two graphs.

Best Answer

Try this

h1 = open('graphcvst1.fig');
h2 = open('graphcvst2.fig');
    % extract data from the first figure
figure(h1)
h = get(gca,'children');
X = get(h,'XData');
Y = get(h,'YData');
    % plot extracted data into the second figure
figure(h2)
hold on
plot(X,Y,'r')
hold off

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MATLAB: Plotting in same figure window

>> help figure

FIGURE Create figure window.
  FIGURE, by itself, creates a new figure window, and returns
  its handle.
    FIGURE(H) makes H the current figure, forces it to become visible,
    and raises it above all other figures on the screen.  If Figure H
    does not exist, and H is an integer, a new figure is created with
    handle H.

So, if you want to always plot on the same figure, you can use h=figure(1), which may not be good in some cases because it over-write the existing figure 1.

Or, you can use close() to close the existing figure first.

In any case, remember figure has a handle. It is like the figure's ID. You can always specify to which figure you want to plot.

h1=figure(1);
set(h1,'name','myname');
plot(1:10);

MATLAB: Ode45 concentration problem

First big error I see is that, assuming your A and h are in meters, you have not correctly converted your

to L.

. You have divided where you should have multiplied. Try this.

C0=0;
tspan = [0 5475]; 
[t,C]=ode45(@concentration, tspan, C0);
plot(t,C)
xlabel('time (hr)')
ylabel('Concentration (mg/L)')
function dCdt=concentration(t,C)
k=5E-6;
A=100*10000;
h=2.5;
V=(A*h)*1000; % Changed to multiply
Q=500000;
Cin=31; % mg/L
dCdt=((Q*Cin)/V-(Q*C)/V-(k*(Cin*exp(-k*t)^2)));
end

Best Answer

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MATLAB: Plotting in same figure window

MATLAB: Ode45 concentration problem

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