Math & Science ⇒ how to get the texts in multiple cases arrays aligned

[NELLLY]

Hello, I have multiple cases arrays as shown below. I need the right hand part(for...)of each case to be vertically aligned with all the other ones. Is there any effective solution?

Code: Select all

\documentclass{article}
\usepackage{amsmath, amssymb}
\usepackage[english]{babel}
\newcommand{\for}{\text{for }}
\begin{document}
\begin{align*}
     p^{00}_{p p'}&=
    \begin{cases}
     e^{-\lambda h}\,P_0(p'|p, n)& \for p_t\leq p_B (a_t=0)\\
     e^{-\lambda h}\,P_0(p'|p=0, n) & \for p_t>p_B (a_t=1)
      \end{cases}\\
     p^{01}_{p p'}&=
    \begin{cases}
    (1- e^{-\lambda h})\,P_1(p'|p, n)& \for p_t\leq p_B (a_t=0)\\
    (1-e^{-\lambda h})\,P_1(p'|p=0, n) & \for p_t>p_B (a_t=1)
    \end{cases}\\
    P^{10}_{p p'}&=
    \begin{cases}
    0                                 &\for p_t\leq p_B (a_t=0)\\
    e^{-\lambda h}\, P_0(p'|p=0, n)   &\for p_t>p_B (a_t=1)
   \end{cases}
\end{align*}
\end{document}

[Stefan Kottwitz]

Very good and complete minimal example! So it makes fun to work with it.

We could create a sophisticated automatic solution, but let's get it done simple and quickly but still self adjusting.

You could save the width of the widest entry, and put just one entry of the shorter cases in a box of that width.

Code: Select all

\documentclass{article}
\usepackage{amsmath, amssymb}
\usepackage[english]{babel}
\newcommand{\for}{\text{for }}

\begin{document}
\newlength{\widest}
\settowidth{\widest}{$(1-e^{-\lambda h})\,P_1(p'|p=0, n)$}
\begin{align*}
     p^{00}_{p p'}&=
    \begin{cases}
     \makebox[\widest][l]{$e^{-\lambda h}\,P_0(p'|p, n)$} & \for p_t\leq p_B (a_t=0)\\
     e^{-\lambda h}\,P_0(p'|p=0, n) & \for p_t>p_B (a_t=1)
      \end{cases}\\
     p^{01}_{p p'}&=
    \begin{cases}
    (1- e^{-\lambda h})\,P_1(p'|p, n)& \for p_t\leq p_B (a_t=0)\\
    (1-e^{-\lambda h})\,P_1(p'|p=0, n) & \for p_t>p_B (a_t=1)
    \end{cases}\\
    P^{10}_{p p'}&=
    \begin{cases}
    \makebox[\widest][l]{$0$} & \for p_t\leq p_B (a_t=0)\\
    e^{-\lambda h}\, P_0(p'|p=0, n)   &\for p_t>p_B (a_t=1)
   \end{cases}
\end{align*}
\end{document}

Stefan

[NELLLY]

Excellent solution Stefan. Thanks