save rows from an array

Question

samuel herrera 2021-11-17

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1589024-save-rows-from-an-array

回答： Robert U 2021-11-17

G=10*10-9;% conductividad

l=1*10^-3;

c=10*10^-9;

u=4*pi*10^-7;

e=(l*c)/u;

g=(u*G)/l;

vs=1;

f=[60 1000];

zs=50;

long=100;

x=0:0.1:100;

%condicione de la carga

zl=-1.2839j;

for ii=1:length(f)

w(ii)=2*pi*f(ii);

z0(ii)=((j*w(ii)*l)/(g+j*w(ii)*c))^(1/2);

prop(ii)=(j*w(ii)*l*(g+j*w(ii)*c))^(1/2);

A{ii}=[(z0(ii)+zs),(z0(ii)-zs);(z0(ii)-zl)*exp(-prop(ii)*long),(z0(ii)+zl)*exp(prop(ii)*long)];

ainv{ii}=inv(A{ii});

vo{ii}=ainv{ii}*[z0(ii)*vs;0];;

vp1{ii}=vo(1)

vp2{ii}=vo(2);

end

hi, does any one know how can i save vp1 and vp2 in list, is always showing me error

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Answer 1

Robert U 2021-11-17

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1589024-save-rows-from-an-array#answer_833889

Hi samuel herrera,

I guess, you would like to store the content of the cell array vo in vp1 and vp2, respectively. You have to address the correct cell:

G = 10*10-9;% conductividad
l = 1*10^-3;
c = 10*10^-9;
u = 4*pi*10^-7;
e = (l*c)/u;
g = (u*G)/l;
vs = 1;
f = [60 1000];
zs = 50;
long = 100;
x = 0:0.1:100;
    
%condicione de la carga
zl = -1.2839j;
for ii=1:length(f)
   w(ii)    = 2*pi*f(ii);
   z0(ii)   = ((1j*w(ii)*l)/(g+1j*w(ii)*c))^(1/2);
   prop(ii) = (1j*w(ii)*l*(g+1j*w(ii)*c))^(1/2);
   A{ii}    = [(z0(ii)+zs),(z0(ii)-zs);(z0(ii)-zl)*exp(-prop(ii)*long),(z0(ii)+zl)*exp(prop(ii)*long)];
   ainv{ii} = inv(A{ii});
   vo{ii}   = ainv{ii}*[z0(ii)*vs;0];
   vp1{ii}  = vo{ii}(1);
   vp2{ii}  = vo{ii}(2);
end
Warning: Matrix is close to singular or badly scaled. Results may be inaccurate. RCOND =  8.003843e-26.
vp1
vp1 = 1×2 cell array
    {[0.0256 + 0.0244i]}    {[0.1030 + 0.0851i]}
vp2
vp2 = 1×2 cell array
    {[9.9755e-15 + 9.8287e-15i]}    {[-1.4010e-53 - 6.0898e-54i]}