Something off with \pause in beamer

Question

Something is off with \pause in my beamer file below. It does not work properly. Any idea why?

% !TEX encoding = UTF-8 Unicode \documentclass{beamer} \begin{document} \begin{frame}[shrink=10] \begin{align} P(Y_i=1) = & \begin{pmatrix} n_i \\ y_i \\ \end{pmatrix}\pi_i^{y_i}(1-\pi_i)^{n_i-y_i} \\ \pause \mathcal{L} (\boldsymbol{\beta|y}) = & \prod_{i=1}^N \begin{pmatrix} n_i \\ y_i \\ \end{pmatrix}\pi_i^{y_i}(1-\pi_i)^{n_i-y_i} \\ \pause = & \prod_{i=1}^N \begin{pmatrix} n_i \\ y_i \\ \end{pmatrix}\Big (\frac{\pi_i}{1-\pi_i} \Big)^{y_i}(1-\pi_i)^{n_i} \\ \pause \log{\mathcal{L} (\boldsymbol{\beta|y}) } = & \sum_{i=1}^N \Bigg[y_i \log{\Big (\frac{\pi_i}{1-\pi_i}\Big )} + n_i \log{(1-\pi_i)} + \log \begin{pmatrix} n_i \\ y_i \\ \end{pmatrix} \Bigg ] \end{align} \end{frame} \end{document}

Section 23.4 of the manual; align doesn't cooperate well with \pause. — egreg
– egreg, Commented Nov 29, 2014 at 18:26
The code above perfectly works on Mac, but not on windows. Any idea how to fix this? — Günal
– Günal, Commented Nov 29, 2014 at 18:28

Gonzalo Medina · Accepted Answer · 2014-11-30 00:23:37Z

Uncovering a displayed multiline numbered formula in beamer is a little tricky, as explained in Section 23.4 Uncovering Tagged Formulas Piecewise of the beamer manual; there, you can also find the recommended approach: to use \uncover and an empty last line afterwards compensated using a negative vertical space:

% !TEX encoding = UTF-8 Unicode \documentclass{beamer} \begin{document} \begin{frame}[shrink=10] \begin{align} \uncover<+->{ P(Y_i=1) &= \binom{n_i}{y_i}\pi_i^{y_i}(1-\pi_i)^{n_i-y_i} \\ } \uncover<+->{ \mathcal{L} (\boldsymbol{\beta\mid y}) &= \prod_{i=1}^N \binom{n_i}{y_i} \\ } \uncover<+->{ \pi_i^{y_i}(1-\pi_i)^{n_i-y_i} &= \prod_{i=1}^N \binom{n_i}{y_i}\Bigl(\frac{\pi_i}{1-\pi_i} \Bigr)^{y_i}(1-\pi_i)^{n_i} \\ } \uncover<+->{ \log{\mathcal{L} (\boldsymbol{\beta|y}) } &= \sum_{i=1}^N \Biggl[y_i \log{\Bigl(\frac{\pi_i}{1-\pi_i}\Bigr)} + n_i \log{(1-\pi_i)} + \log \binom{n_i}{y_i}\Biggr] \\ } \notag \end{align} \vskip-1.5em \end{frame} \end{document}

An animation of the result:

enter image description here

Not related to the question, but I made some other modifications to your code: to use \binom instead of bmatrix and to use the "lateral" versions \Biggl, \Biggr instead of just \Bigg to guarantee proper space handling.

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