LaTeX forum ⇒ Math & ScienceHorizontal Spacing in aligned Equations

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Horizontal Spacing in aligned Equations

Postby Pratt_G » Mon Sep 02, 2013 6:05 pm


can anyone please help me understand the following two issues?

  1. Why do I get non-uniform and inordinate spacing between the columns? The first summation is very close to "min" and the second summation is way too from the first summation.
  2. Is there any way to left-align the columns? I want the third columns to be aligned left.

  1. \documentclass[11 pt]{article}
  2. \usepackage {amsmath}
  4. \begin{document}
  5. \begin{subequations}
  6. \begin{align}
  7. \min\limits_{\lambda} & \sum\limits_{k \in R} & (\sum\limits_{i=1}^{M} a_i \quad +\\
  8. & & \sum \limits_{j=1}^N b_j \quad + \quad \sum \limits_{j=1}^N c_j \quad + \\
  9. \end{align}
  10. \end{subequations}
  11. \end{document}

Last edited by localghost on Mon Sep 02, 2013 6:12 pm, edited 1 time in total.
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Postby localghost » Mon Sep 02, 2013 6:21 pm

The alignat environment is your friend.
  1. \documentclass[11pt]{article}
  2. \usepackage{mathtools} % loads »amsmath«
  4. \begin{document}
  5. \begin{subequations}
  6. \begin{alignat}{2}
  7. \min\limits_{\lambda} & \sum\limits_{k\in R} & \Big(\sum\limits_{i=1}^{M} a_i \quad + \\
  8. & \sum \limits_{j=1}^N b_j \quad + \quad &\sum\limits_{j=1}^N c_j \quad +
  9. \end{alignat}
  10. \end{subequations}
  11. \end{document}

Since there seem to be going more elements into the equations, you might need to choose another number as parameter for the environment.

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Postby Pratt_G » Tue Sep 03, 2013 6:13 am

Thanks. That worked. But in my general experience align and alignat have been very painful to use especially because their preset horizontal alignments. I prefer to use array instead, as it allows me to flexibly choose the alignment of individual columns. Now only if there was a way to use array under subequations environment.

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