MATLAB Answers

Error: Conversion to double from sym is not possible.

1 view (last 30 days)
Aisha F Colindres
Aisha F Colindres on 26 Nov 2017
Answered: Karan Gill on 27 Nov 2017
I created a code to plot x versus a range of T as follows but keep getting the error "Conversion to double from sym is not possible. None of my attempts to fix this has worked, any help would be appreciated.
clc;clear all
V=3785.4; %dm^3
Kco=3;
z=2902.14;
dHrx=-25000; %cal/mol
R=1.987; %cal/mol*K
To=300; %K
T=300:320;
E=15000; %cal/mol
y=exp((E/R)*((1/To)-(1./T)));
Kc=Kco*(exp((dHrx/R)*((1/To)-(1./T))));
syms x V z y Kc
eqn=V-((z./y).*(x./(((1-x).^2)-((1./Kc)*(x.^2))))) == 0;
solx=solve(eqn,x)
plot(x,T)

  0 Comments

Sign in to comment.

Answers (1)

Karan Gill
Karan Gill on 27 Nov 2017
To plot symbolic expressions, use fplot instead of plot. See https://www.mathworks.com/help/symbolic/fplot.html .
Also, why are you plotting "x" against "t"? I assume you want to plot "solx".

  0 Comments

Sign in to comment.

Sign in to answer this question.