Hi there every one(adsbygoogle = window.adsbygoogle || []).push({});

I need some help with the following function:

function cc = find_cc(n)

global nu

cc(1)=(-8.*i.*nu1-3.*n.^2-5+4.*i.*nu1.*n-4.*n)./n./(-n-2+4.*i.*nu1);

cc(2)=(3.*n.^2+2.*n+4)./n./(-n-2+4.*i.*nu1);

cc(3)=-(n-1).*(n+1)./n./(-n-2+4.*i.*nu1);

end

where

\nu is abitrary variable. cc(1), cc(2) and cc(3) are entries of a cc(3,1) matrix. Each time I run the above function I get the following message:

"In an assignment A(I) = B, the number of elements in B and

I must be the same"

I guess the problem here is \nu because if I set \nu to 1 the it works. But I want \new to be abbitrary. The above function is called by this function

function vs=reg_series(s)

global nu;

cc1=find_cc(1);

cc2=find_cc(2);

cc3=find_cc(3);

aa0=1;

aa(1)=aa0*cc1(1);

aa(2)=aa0*cc2(2)+aa(1)*cc2(1);

aa(3)=aa0*cc3(3)+aa(1)*cc3(2)+aa(2)*cc3(1);

sn=s.^3;

ss=aa0+aa(1).*s+aa(2).*s.^2+aa(3).*s.^3;

dss_ds=aa(1)+2.*s.*aa(2)+3.*s.^2.*aa(3);

asn=ones(length(s));

nn=4;

while ((abs(nn*asn(length(asn)))>1e-18) && (nn<500))

cct=find_cc(nn);

aa(nn)=aa(nn-1)*cct(1)+aa(nn-2)*cct(2)+aa(nn-3)*cct(3);

dss_ds=dss_ds+sn.*nn*aa(nn);

sn=s.*sn;

asn=aa(nn).*sn;

ss=ss+asn;

nn=nn+1;

end

dss_dz=-2*dss_ds;

vs=ss./dss_dz;

end

to generate a series with \nu as abitrary function. If I use "syms" on to keep \nu as a variables in the function cc = find_cc(n) above, then function vs=reg_series(s) is given me the following error message after the second last end command

"Function 'gt' is not defined for values of class 'sym'."

ANY HELP GUYS?

Amos

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# Some Matlab technical programming problem

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