[Tex/LaTex] How to define a piecewise function in latex


I just saw this question but it doesn't answer mine. How do I define a function something like

f(x) = { bla bla if x<0
bla bla if x>0

The above question doesn't answer how to write f(x) before the bracket

Please help.

Best Answer

LaTeX is very flexible. Although it is not WYSIWYG you can write it in a very logical way. So if you want to have to have f(x) precede your cases, just write it that way. Here with the example of the linked question.



    \[ f(x) = \begin{cases} 
          0 & x\leq 0 \\
          \frac{100-x}{100} & 0\leq x\leq 100 \\
          0 & 100\leq x 
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