\begin{table}[h+]
This gives a syntax error in pdflatex. I guess I am missing a package, but I cannot think which one it is. I have installed every package I can think of ....
1 Answer
Up to LaTeX release 2015/01/01, an input such as
\begin{table}[h+]
wouldn't have produced an error, but the + would have done nothing at all.
Starting from that release, illegal characters in the optional argument to a float environment (table, figure or others defined by additional packages) produce an error
Unknown float option `<opt>'
in your case
Unknown float option `+'
Note that the only legal characters are
h t b p !
With the float package, one can use H (alone), but it's not recommended.
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I have been using the + for ages! OH OK maybe it was simply being ignored. Was told by someone it made the placement stronger back in about 2003....– RobinCommented Jan 3, 2017 at 13:45
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+seems to be wrong! I don't know this float parameter.+used as a float specifier, I've never seen it before. Any subset ofhtbp!is valid without packages.\begin{table}[h!]. That, or one or more of the following letters:h,t,b, andp. For sure , if you use!instead of+, the syntax error is gone.[h]but (thankfully for lots of unsuspecting users) not for[h!]: LaTeX automatically changes all instances of[h!]to[ht!]. The effect of[ht!]: if LaTeX can't place the float "right here" on the current page, it will place it at the top of the very next next page.