Error: Conversion to double from sym is not possible.

Question

Aisha F Colindres 2017-11-26

0
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https://ww2.mathworks.cn/matlabcentral/answers/369322-error-conversion-to-double-from-sym-is-not-possible

回答： Karan Gill 2017-11-27

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)