How to write this Piecewise function using LaTeX?
I tried
$
\begin{array}{cc}
\{ &
\begin{array}{cc}
0 & x\leq 0 \\
\frac{100-x}{100} & 0\leq x\leq 100 \\
0 & 100\leq x
\end{array}
\end{array}
$
but it didn't work perfectly, the bracket "{" looks small, see:
Best Answer
This situation is exactly what the
cases
environment from theamsmath
package was designed for. If you putin your preamble then you can wite
to adapt your example with the correct size bracket.
As for not being able to use TeX-like syntax to write equations on this site: this is a deliberate choice. Most of the time we actually want to talk about the TeX source here rather than the equations (or whatever) it produces; and there are times when it could be actively confusing to have a TeX-like process to produce images that isn't actually TeX (in its full, Turing-complete, confusing glory...)
(See the discussion on meta for more on this, if you're interested.)