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## Re: [Orgmode] The \only<> overlay in beamer

 From: Carsten Dominik Subject: Re: [Orgmode] The \only<> overlay in beamer Date: Wed, 29 Sep 2010 18:12:00 +0200

```
On Sep 18, 2010, at 8:15 PM, Rafael Calsaverini wrote:

```
```Hi there.

```
I'm trying to use the \only<> command to produce a beamer presentation but it seems that org-beamer filters out this. I've tried it in many different ways, and didn't get the desired effect.
```
Particularly, I've tried the obviously wrong thing:
#+STARTUP:      beamer
#+LaTeX_CLASS: beamer
#+LaTeX_CLASS_OPTIONS: [smaller, presentation]

* Foo
** Slide 1
\only<1> {
***  Block1     :B_block:
:PROPERTIES:
:BEAMER_env: block
:END:
- bla11
- bla12
- bla13
}
\only<2>{
***  Block2     :B_block:
:PROPERTIES:
:BEAMER_env: block
:END:
- bla21
- bla22
- bla23
}

```
Which obviously break-up. And I also tried what I believe would be a nice syntax for this:
```
* Foo
** Slide 1
***  Block1    :B_block:
:PROPERTIES:
:BEAMER_envargs: \only<1>
:BEAMER_env: block
:END:
- bla11
- bla12
- bla13

***  Block2     :B_block:
:PROPERTIES:
:BEAMER_envargs: \only<2>
:BEAMER_env: block
:END:
- bla21
- bla22
- bla23

```
Apparently the parser just removes the "\only" and interprets this as <1> and <2>. The resulting latex is exactly the same as if the "\only" wasn't there.
```
Is there a way to use the "\only<>" overlay in a clean way?
```
```
What does \only do?

- Carsten

```