fsolve
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From: yuan xia on 16 Apr 2010 01:04 I want to make out x,my procedure is as follows: function f=yt(x); f=[exp(-x(1)*6.1)*x(6)+x(7)*exp(-x(2)*6.1)+(1-x(6)-x(7))*exp(-x(3)*6.1)-(1-0.6944);exp(-x(1)*28.15)*x(8)+x(9)*exp(-x(2)*28.15)+(1-x(8)-x(9))*exp(-x(3)*28.15)-(1-0.8992);exp(-x(1)*30.43)*x(10)+x(11)*exp(-x(2)*30.43)+(1-x(10)-x(11))*exp(-x(3)*30.43)-(1-0.8121);exp(-x(1)*11.76)*x(12)+x(13)*exp(-x(2)*11.76)+(1-x(12)-x(13))*exp(-x(3)*11.76)-(1-0.6721);exp(-x(1)*14.32)*x(14)+x(15)*exp(-x(2)*14.32)+(1-x(14)-x(15))*exp(-x(3)*14.32)-(1-0.5779);x(8)*(1-exp(-x(1)*28.15))-0.8992*x(10);x(9)*(1-exp(-x(2)*28.15))-0.8992*x(11);x(12)*(1-exp(-x(1)*11.76))-(1-0.6721)*x(14);x(13)*(1-exp(-x(2)*11.76))-(1-0.6721)*x(15);x(6)*exp(-x(1)*6.1)+x(10)(1-exp(-x(1)*30.43))-(1+0.8121-0.6944)*x(8);x(7)*exp(-x(2)*6.1)+x(11)(1-exp(-x(2)*30.43))-(1+0.8121-0.6944)*x(9);x(4)+x(8)*exp(-x(1)*28.15)+x(12)(1-exp(-x(1)*11.76))-(1-0.8992+0.6721+x(4)+x(5))*x(6);x(5)+x(9)*exp(-x(2)*28.15)+x(13)(1-exp(-x(2)*11.76))-(1-0.8992+0.6721+x (4)+x(5))*x(7);x(6)*exp(-x(1)*6.1)+x(14)*(1-exp(-x(1)*14.32))-(1+0.5779-0.6944)*x(12);x(7)*exp(-x(2)*6.1)+x(15)*(1-exp(-x(2)*14.32))-(1+0.5779-0.6944)*x(13)]; >> x0=[0.8;0.5;0.3;0.5;0.2;0.5;0.2;0.5;0.2;0.5;0.2;0.5;0.2;0.5;0.2]; options=optimset('Display','off'); [x,fval,exitflag]=fsolve('yt',x0,options) Error: File: C:\MATLAB7\work\yt.m Line: 2 Column: 626 ()-indexing must appear last in an index expression. Error in ==> fsolve at 180 fuser = feval(funfcn{3},x,varargin{:}); Can anyone help me,thanks very much!
From: Walter Roberson on 16 Apr 2010 01:25 yuan xia wrote: > I want to make out x,my procedure is as follows: > function f=yt(x); > f=[exp(-x(1)*6.1)*x(6)+x(7)*exp(-x(2)*6.1)+(1-x(6)-x(7))*exp(-x(3)*6.1)-(1-0.6944);exp(-x(1)*28.15)*x(8)+x(9)*exp(-x(2)*28.15)+(1-x(8)-x(9))*exp(-x(3)*28.15)-(1-0.8992);exp(-x(1)*30.43)*x(10)+x(11)*exp(-x(2)*30.43)+(1-x(10)-x(11))*exp(-x(3)*30.43)-(1-0.8121);exp(-x(1)*11.76)*x(12)+x(13)*exp(-x(2)*11.76)+(1-x(12)-x(13))*exp(-x(3)*11.76)-(1-0.6721);exp(-x(1)*14.32)*x(14)+x(15)*exp(-x(2)*14.32)+(1-x(14)-x(15))*exp(-x(3)*14.32)-(1-0.5779);x(8)*(1-exp(-x(1)*28.15))-0.8992*x(10);x(9)*(1-exp(-x(2)*28.15))-0.8992*x(11);x(12)*(1-exp(-x(1)*11.76))-(1-0.6721)*x(14);x(13)*(1-exp(-x(2)*11.76))-(1-0.6721)*x(15);x(6)*exp(-x(1)*6.1)+x(10)(1-exp(-x(1)*30.43))-(1+0.8121-0.6944)*x(8);x(7)*exp(-x(2)*6.1)+x(11)(1-exp(-x(2)*30.43))-(1+0.8121-0.6944)*x(9);x(4)+x(8)*exp(-x(1)*28.15)+x(12)(1-exp(-x(1)*11.76))-(1-0.8992+0.6721+x(4)+x(5))*x(6);x(5)+x(9)*exp(-x(2)*28.15)+x(13)(1-exp(-x(2)*11.76))-(1-0.8992+0.6721+x > (4)+x(5))*x(7);x(6)*exp(-x(1)*6.1)+x(14)*(1-exp(-x(1)*14.32))-(1+0.5779-0.6944)*x(12);x(7)*exp(-x(2)*6.1)+x(15)*(1-exp(-x(2)*14.32))-(1+0.5779-0.6944)*x(13)]; > Error: File: C:\MATLAB7\work\yt.m Line: 2 Column: 626 > ()-indexing must appear last in an index expression. It did tell you the exact line and column of the problem. The sub-expression causing the problem is: x(11)(1-exp(-x(2)*30.43) Perhaps you meant to have an * between the x(11) and the rest. There is no implicit multiplication in symbolic expressions.
From: Steven Lord on 16 Apr 2010 09:49 "Walter Roberson" <roberson(a)hushmail.com> wrote in message news:hq8sc6$n41$1(a)canopus.cc.umanitoba.ca... > yuan xia wrote: >> I want to make out x,my procedure is as follows: >> function f=yt(x); >> f=[exp(-x(1)*6.1)*x(6)+x(7)*exp(-x(2)*6.1)+(1-x(6)-x(7))*exp(-x(3)*6.1)-(1-0.6944);exp(-x(1)*28.15)*x(8)+x(9)*exp(-x(2)*28.15)+(1-x(8)-x(9))*exp(-x(3)*28.15)-(1-0.8992);exp(-x(1)*30.43)*x(10)+x(11)*exp(-x(2)*30.43)+(1-x(10)-x(11))*exp(-x(3)*30.43)-(1-0.8121);exp(-x(1)*11.76)*x(12)+x(13)*exp(-x(2)*11.76)+(1-x(12)-x(13))*exp(-x(3)*11.76)-(1-0.6721);exp(-x(1)*14.32)*x(14)+x(15)*exp(-x(2)*14.32)+(1-x(14)-x(15))*exp(-x(3)*14.32)-(1-0.5779);x(8)*(1-exp(-x(1)*28.15))-0.8992*x(10);x(9)*(1-exp(-x(2)*28.15))-0.8992*x(11);x(12)*(1-exp(-x(1)*11.76))-(1-0.6721)*x(14);x(13)*(1-exp(-x(2)*11.76))-(1-0.6721)*x(15);x(6)*exp(-x(1)*6.1)+x(10)(1-exp(-x(1)*30.43))-(1+0.8121-0.6944)*x(8);x(7)*exp(-x(2)*6.1)+x(11)(1-exp(-x(2)*30.43))-(1+0.8121-0.6944)*x(9);x(4)+x(8)*exp(-x(1)*28.15)+x(12)(1-exp(-x(1)*11.76))-(1-0.8992+0.6721+x(4)+x(5))*x(6);x(5)+x(9)*exp(-x(2)*28.15)+x(13)(1-exp(-x(2)*11.76))-(1-0.8992+0.6721+x >> (4)+x(5))*x(7);x(6)*exp(-x(1)*6.1)+x(14)*(1-exp(-x(1)*14.32))-(1+0.5779-0.6944)*x(12);x(7)*exp(-x(2)*6.1)+x(15)*(1-exp(-x(2)*14.32))-(1+0.5779-0.6944)*x(13)]; > >> Error: File: C:\MATLAB7\work\yt.m Line: 2 Column: 626 >> ()-indexing must appear last in an index expression. > > It did tell you the exact line and column of the problem. > > The sub-expression causing the problem is: > > x(11)(1-exp(-x(2)*30.43) > > Perhaps you meant to have an * between the x(11) and the rest. There is no > implicit multiplication in symbolic expressions. Another suggestion; break your expression for f onto multiple lines, to make it easier to read and easier to tell exactly what's being used to compute each element of f. f=[exp(-x(1)*6.1)*x(6)+x(7)*exp(-x(2)*6.1)+(1-x(6)-x(7))*exp(-x(3)*6.1)-(1-0.6944); .... exp(-x(1)*28.15)*x(8)+x(9)*exp(-x(2)*28.15)+(1-x(8)-x(9))*exp(-x(3)*28.15)-(1-0.8992); .... exp(-x(1)*30.43)*x(10)+x(11)*exp(-x(2)*30.43)+(1-x(10)-x(11))*exp(-x(3)*30.43)-(1-0.8121); .... exp(-x(1)*11.76)*x(12)+x(13)*exp(-x(2)*11.76)+(1-x(12)-x(13))*exp(-x(3)*11.76)-(1-0.6721); ..... % etc Assuming there are no line breaks in the message as posted, isn't that a little easier to read? -- Steve Lord slord(a)mathworks.com comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ
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