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>> bb0=[1,1]
[bb,resnorm]=lsqnonlin('wils',bb0)
function  F=wils(bb)
x1=[0.373 0.101 0.562];
x2=1-x1;
y1=[0.501 0.183 0.688];
y2=1-y1;
Pa0=[147.41 184.23 123.42];
Pb0=[71.12 90.35 58.73];
for i=1:4
F(i)=log(y1(i)*101.3/Pa0(i)*x1(i))+log(x1(i)+bb(1)*x2(i))-x2(i)*(bb(1)/(x1(i)+bb(1)*x2(i))-bb(2)/(x2(i)+bb(2)*x1(i)))
end
for i=5:8
j=i-4
F(i)=log(y2(j)*101.3/Pb0(j)*x2(j))+log(x2(j)+bb(2)*x1(j))-x1(j)*(bb(2)/(x2(j)+bb(2)*x1(j))-bb(1)/(x1(j)+bb(1)*x2(j)))
end

bb0 =

     1     1
Error using feval
Undefined function 'wils' for input arguments of type 'double'.

Error in lsqnonlin (line 194)
            initVals.F = feval(funfcn{3},xCurrent,varargin{:});
ÏëÎÊÒ»ÏÂÔõôÐ޸ġ£ÎÒÖ»ÊÇÏëÇóÒ»ÏÂwilson·½³ÌµÄÅäż²ÎÊý£¬¦Ë12ºÍ¦Ë21.ллÁË£¡
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