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Attempt to add "Cc" to a static workspace #2

function[]=calc() 
Rg=8.314;T=773; 
psi=6894.75;Pg=75*psi;%Pg=Gas Pressure 
ybulk=1*10^-3;%ybulk=Oxygen mole fraction in bulk 
Cg=ybulk*Pg/(Rg*T); 
syms C Cc Cs;%Concentration Variables 
syms r rc R;%Position Variables 
Ri=1*10^-6; 
E=30000*4.18;%Activation Energy,E in J/mol 
%syms kf kr;%Mass Transfer Coefficients 
kf=2.3*10^6*exp(-E/(Rg*T)); 
%syms D denAl denOx MAl MOx; 
D=1.72*10^-9;%Diffusivity of Oxygen 
MAl=26;MOx=102;               %MAl=molar mass of Al,MOx=molar mass of 
Alumina% 
denAl=2700;denOx=4000;        %densities of Al,Alumina% 
kr=1; 
R=vpa((rc^3+(denOx*MAl/(denAl*MOx)*(Ri^3-rc^3)))^(1/3),4);%Particle 
Size 
C=Cc+(Cs-Cc)*(1-rc/r)/(1-rc/R);%Concentration relation 
rate1=-4*pi*R^2*kf*(Cg-Cs);%Diffusion Rate through Gas Film 
rate2=-4*pi*rc^2*D*subs(diff(C),r,rc);%Diffusion rate through oxide 
layer 
rate3=-4*pi*rc^2*kr*Cc;%Oxygen Consumption Rate due to reaction 

Cs1=solve(rate1-rate2,'Cs'); 
Cc1=solve(rate2-rate3,'Cc'); 
Cc2=vpa(subs(Cc1,Cs,Cs1),4); 
Cc3=solve(Cc2-Cc,Cc); 
C1=subs(C,Cs,Cs1); 
C2=subs(C1,Cc,Cc3); 

Rfinal=subs(R,rc,0); 
eqn=R; 
syms R1; 
rcfun=solve(eqn-R1,rc); 

C=matlabFunction(C2); 

k=1/(-4/3*MAl*kr/denAl); 
Ccf=k/Cc3; 
Ccinv=matlabFunction(Ccf); 

function rcprime=fun(t,rc) 

    rcprime=Ccinv; 
end 


tspan=[0 0.008]; 
X=1-power(rc/Ri,3);%X=conversion 
[t rc]=ode45('fun',tspan,rc0); 
figure;plot(t,X); 
end 

??? Error using ==> assignin 
Attempt to add "Cc" to a static workspace. 
 See MATLAB Programming, Restrictions on Assigning to Variables for 
details. 

Error in ==> syms at 77 
      assignin('caller',x,sym(x)); 

Error in ==> calc at 7 
syms C Cc Cs;%Concentration Variables 

how can i assign variables within my function to perform calculations? 
please get me through this. 

Thanks, 
Viswanath. 
0
6/14/2011 6:12:05 AM
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Attempt to add "Cc" to a static workspace
function[]=calc() Rg=8.314;T=773; psi=6894.75;Pg=75*psi;%Pg=Gas Pressure ybulk=1*10^-3;%ybulk=Oxygen mole fraction in bulk Cg=ybulk*Pg/(Rg*T); syms C Cc Cs;%Concentration Variables syms r rc R;%Position Variables Ri=1*10^-6; E=30000*4.18;%Activation Energy,E in J/mol %syms kf kr;%Mass Transfer Coefficients kf=2.3*10^6*exp(-E/(Rg*T)); %syms D denAl denOx MAl MOx; D=1.72*10^-9;%Diffusivity of Oxygen MAl=26;MOx=102; %MAl=molar mass of Al,MOx=molar mass of Alumina% denAl=2700;denOx=4000; %densities of Al,Alumina% kr=1; R=vpa((rc^3+(denOx*MAl/(denAl*MOx)*(Ri^3-rc^3)))^(1/3),4);%Particle Size C=Cc+(Cs-Cc)*(1-rc/r)/(1-rc/R);%Concentration relation rate1=-4*pi*R^2*kf*(Cg-Cs);%Diffusion Rate through Gas Film rate2=-4*pi*rc^2*D*subs(diff(C),r,rc);%Diffusion rate through oxide layer rate3=-4*pi*rc^2*kr*Cc;%Oxygen Consumption Rate due to reaction Cs1=solve(rate1-rate2,'Cs'); Cc1=solve(rate2-rate3,'Cc'); Cc2=vpa(subs(Cc1,Cs,Cs1),4); Cc3=solve(Cc2-Cc,Cc); C1=subs(C,Cs,Cs1); C2=subs(C1,Cc,Cc3); Rfinal=subs(R,rc,0); eqn=R; syms R1; rcfun=solve(eqn-R1,rc); %Cc=Cc3; C=matlabFunction(C2); k=1/(-4/3*MAl*kr/denAl); Ccf=k/Cc3; Ccinv=matlabFunction(Ccf); %rate=4/3*rate3;%Aluminium Consumption Rate %t=vpa(k*int(1/Cc),2); %eqn=t-int(1/fun,rc); %tmax=vpa(subs(t,rc,0)-subs(t,rc,Ri),4); %tmax=-4/3*MAl/denAl*kr*quadgk(1/Cc,Ri,0); X=1-power(rc/Ri,3);%X=conversion %quad(vpa(1/Cc,2),R0,0) function rcprime=fun(t,rc) rcprime=Ccinv; end tspan=[0 0.008]; %X=1-power...

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When to use "." and when to use "!"
I'm still confused about this and I can't find anywhere that explains it properly. I have the MS book "Access 2003" in front of me and I'm reading Part 5 about VB and so on. It's telling me about how to refer to a specific database and has the example:- Dim dbMyDb As DAO.Database Set dbMyDb = DBEngine.Workspaces(0).Databases(0) but, but, but, but - what do those dots (periods, full stops, call them what you will) mean? (OK, it appears to be the same usage as C/C++/Java when referring to class/structure members, but I wish it would tell me that somewhere) Why are there dots used in referring to object members in this case but when referring to controls on forms (for example) one uses "!". Surely there must be somewhere that helps one understand this basic syntax. -- Chris Green Generally, a dot exposes properties and methods and a bang (!) exposes members of a collection. So forms!frmMyForm.Visible refers to the visible property of frmMyForm, which is a member of the forms collection. What makes this harder (or easier, depending on your perspective) to grasp, is that Access has gotten more and more forgiving about using the "wrong" notation. usenet@isbd.co.uk wrote in news:44316bba.0@entanet: > I'm still confused about this and I can't find anywhere that explains > it properly. > > I have the MS book "Access 2003" in front of me and I'm reading Part 5 > about VB and so on....

How to record "item" instead of "value" of a combo box? #2
Hi, &nbsp; I'm using the combo box where items and values are different.&nbsp; When probing at the combo box output while system is running, it shows "value" as expected.&nbsp; However, I want to record the "item" of the combo box and not the "value".&nbsp; Please help! &nbsp; Ex: &nbsp; Combo box Voltage Items &nbsp; thanks, Anh ...

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