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Mathematica > Core Language > Procedural Programming > Conditionals > Which >

BUILT-IN MATHEMATICA SYMBOL

Which

evaluates each of the

in turn, returning the value of the

corresponding to the first one that yields True.

If any of the evaluated by Which give neither True nor False, then a Which object containing these remaining elements is returned unevaluated. »

Out[1]=

Which can be maintained in symbolic form:

Conditions are evaluated until one is found that is neither True nor False:

Use True for an else clause that always matches:

Define a piecewise function:

Expand it to use Piecewise:

Do symbolic operations:

Use Which rather than a nested if-then-elsif chain: