I'm struggling to plot this graph

Hoi Tsim

2015 10 14

2 个回答

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I have this equation

with the variables

and i'm trying to get this plot

I keep getting a straight line.I'm not sure what I have done wrong.

Can anyone help me and copy and paste the input which is needed to form this plot.

thanks for the help in advance.

采纳的回答

Star Strider 2015-10-14

0 个投票

This plots correctly for me:

aeq = @(T,Ts,dT,a) a(1) - 0.5*a(2).*(1 + tanh((T - Ts)./dT));

a = [0.58; 0.47];
Ts = 283;
dT = 24;
T = linspace(250, 310);

figure(1)
plot(T, aeq(T,Ts,dT,a))
hold on
plot(288, aeq(288,Ts,dT,a), '+r')
hold off

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Hoi Tsim 2015-10-17

i have looked at my notes and i see that σ = 5.670367 × 10-8 kg s-3 K-4

does this help with continuing the question?

do i just set it out like the first plot you helped me with, defining each equation and then after >> figure i type.. plot(T, aeq(T,Ts,dT,a),Ri,Ro)?

Star Strider 2015-10-17

I still don’t know what Q is, or how to calculate it. (It seems to be a variable, and could be either data a function. It is necessary to calculate at least one other variable in your other two Questions, and in one is the essence of the Question.)

Sorry, but full stop until I get a definition for Q!

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