How to solve 2 equations with 2 unknown variables and plot the result?
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Nabilla Dewi Septiani
le 6 Déc 2021
Commenté : Nabilla Dewi Septiani
le 9 Déc 2021
I have this code to solve 2 equations with 2 unknown variables. And there are 2 known variables that is in a range. It gives the result but only one, where I expect it to be in a range too. Also, I could not plot it.
%Parameters
xin=0.2; xout=0.1; Pr=0.3; qf=1;
x=0:0.1:1;
alpha=0:100:1000;
%For Cross-Flow Module (CF)
y=(1+(x+Pr).*(alpha-1))-((1+(x+Pr).*(alpha-1)).^2-(4.*alpha.*(alpha-1).*x.*Pr)).^0.5/(2.*Pr.*(alpha-1))
%qfout-qf=-(1-Pr+((alpha-1).*(x-Pr.*y)))*a
%x-xin=(-(1/qf).*(alpha.*(x-(Pr.*y))*a)+(-x.*ln(qfout/qf))
syms a qfout
E=-(1-Pr+((alpha-1).*(x-Pr.*y)))*a==qfout-qf , (-(1/qf).*alpha.*(x-(Pr.*y))*a)+(-x.*log(qfout/qf))==x-xin;
S=solve(E,a,qfout)
plot(alpha,a)
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KSSV
le 6 Déc 2021
You need to convert the sym class to double using double.
plot(double(alpha),double(E))
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