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I would like to display a figure in a 2 column document, though the figure has to appear over the 2 columns on a fixed position. I tried this:

 \caption{Comparison of the classification algorithms with different feature space sizes}

But it does not work. Nothing really works when changing the H to h or ht etc ...

Anyone know the solution to this problem ?

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"does not work" doesn't say why. do you mean "on a fixed page", or the alignment of what's in the figure isn't what you want, or ... what? please note that h or H would have no effect, since figure* can appear only at the top of a two-column page, not in the middle or at the bottom. – barbara beeton Jan 31 '13 at 13:53
I want to have the figure on a fixed position. And the "why", I have no idea. It just isn't appearing on the right page – Ojtwist Jan 31 '13 at 14:11
i should have said "doesn't say how" it doesn't work. by "fixed position" do you mean somewhere other than at the top of the page? – barbara beeton Jan 31 '13 at 15:05
If I use "H", it just disappears completely. If I use h it will appear on top of a page where it is not supposed to be – Ojtwist Jan 31 '13 at 15:27
up vote 1 down vote accepted

based on an interchange of comments, i infer that this figure* is wanted somewhere other than at the top of a page.

see lamport, p.197, section c.9.1: h and b are "not possible for double-column figures or tables in two-column format."

some other approaches have been developed that you might find useful, for example as presented in this question: One column equation in twocolumn document class.

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