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MATLAB Central > MATLAB Newsreader > Unoptimisationable 

Very much stuck with this problem, have looked high and low for at least a month now but cannot find it. I am looking for an equation whereby one of BFGS, DFP or Steepest Descent, cannot optimise but the remaining two will. 
aaron brocq 
aaron brocq <arun.september@gmail.com> wrote in message <32065160.57252.1240173976942.JavaMail.jakarta@nitrogen.mathforum.org>... 
Hi ImageAnalyst, 
aaron brocq <arun.september@gmail.com> wrote in message <28114932.2595.1240261955314.JavaMail.jakarta@nitrogen.mathforum.org>... 
That is correct John, I meant optimise a function. 
aaron brocq <arun.september@gmail.com> wrote in message <32065160.57252.1240173976942.JavaMail.jakarta@nitrogen.mathforum.org>... 
Sorry, should read: 
aaron brocq <arun.september@gmail.com> wrote in message <28114932.2595.1240261955314.JavaMail.jakarta@nitrogen.mathforum.org>... 
"Matt " <xys@whatever.com> wrote in message <gsjk41$mjq$1@fred.mathworks.com>... 
>But you still didn't answer my question about what step size rule you are meant to assume. 
aaron brocq <arun.september@gmail.com> wrote in message <20007910.5671.1240313881491.JavaMail.jakarta@nitrogen.mathforum.org>... 
aaron brocq <arun.september@gmail.com> wrote in message <20007910.5671.1240313881491.JavaMail.jakarta@nitrogen.mathforum.org>... 
aaron brocq <arun.september@gmail.com> wrote in message <20007910.5671.1240313881491.JavaMail.jakarta@nitrogen.mathforum.org>... 
Appreciate your help guys, tried the given function and when applied to the fminunc command I get the following problem; 
Having greater problems now, 
aaron brocq <arun.september@gmail.com> wrote in message <17002811.8040.1240347416664.JavaMail.jakarta@nitrogen.mathforum.org>... 
Ive now been told by my senior lecturer that this is not the correct function and that I should be looking at test functions or something linked to Rosenbrock's function. 
aaron brocq <arun.september@gmail.com> wrote in message <25125789.11455.1240411895845.JavaMail.jakarta@nitrogen.mathforum.org>... 
>I just want to point out, however, that if you use a proper line search algorithm, all 3 algorithms will >probably work fine. My proposal was that you don't do line search, but instead use a constant stepsize. 
>I just want to point out, however, that if you use a proper line search algorithm, all 3 >algorithms will probably work fine. My proposal was that you don't do line search, but >instead use a constant stepsize. 
aaron brocq <arun.september@gmail.com> wrote in message <21387750.277.1240486823479.JavaMail.jakarta@nitrogen.mathforum.org>... 
Im not fluent in how to do this, part of my project was also to learn how to use Matlab. 

aaron brocq <arun.september@gmail.com> wrote in message <6768720.1645.1240508612321.JavaMail.jakarta@nitrogen.mathforum.org>... 
Much appreciated Matt, ill give that a go. 
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