Math & Science ⇒ Writing a cased Equation

[ostadomid]

Hi,

I am writing a paper and have been stuck on a certain cased equation within it for a few hours. Here's what I'm trying to write.

hue-calc.gif (3.9 KiB) Viewed 4884 times

Disregard that "mod6" and all the "primes" and stuff. Here's what I've written.

Code: Select all

\begin{equation}
  H=
  \begin{cases}
    60^\circ\times\frac{G-B}{\Delta} & \quad \text{if $Max(R,G,B)=R$} \\
    60^\circ\times\frac{B-R}{\Delta}+ 2 & \quad \text{if $Max(R,G,B)=G$} \\
    60^\circ\times\frac{R-G}{\Delta}+ 4 & \quad \text{if $Max(R,G,B)=B$}
  \end{cases}
\end{equation}

I'm getting the error where the \quad and \text enters. When I remove all the cases and just write the equations alone, they work fine. Can someone please help me fix this. Thanks in advance.

[Johannes_B]

Did you load amsmath?

Code: Select all

\documentclass[12pt]{article}
\usepackage{amsmath}
\begin{document}
\begin{equation}
  H=
  \begin{cases}
    60^\circ\times\frac{G-B}{\Delta} & \quad \text{if}   \quad \text{Max}(R,G,B)=R \\
    60^\circ\times\frac{B-R}{\Delta}+ 2 & \quad \text{if}\quad Max(R,G,B)=G \\
    60^\circ\times\frac{R-G}{\Delta}+ 4 & \quad \text{if}\quad Max(R,G,B)=B
  \end{cases}
\end{equation}
\end{document}

[ostadomid]

Thanks alot Johannes. A total lifesaver. This was my first real LaTeX project and although I read alot about this I couldnt fix it myself. Thats why I asked for help here. In any case thanks for your help