is a global variable whose value, if set, is applied to every output expression.
$Post
is a global variable whose value, if set, is applied to every output expression.
Examples
Basic Examples (3)
By default, $Post is not defined, meaning output comes directly from evaluation:
$PostSet $Post to N so that all expressions are evaluated numerically after evaluation:
$Post = N;Sin[1]Solve[x ^ 5 - x + 1 == 0, x]Restore $Post to the default:
$Post=.Set $Post to Simplify so that symbolic simplification is tried on each output:
$Post = Simplify;(x + 1)(x - 1)Integrate[(x ^ 3 + x) / (1 + x), x]Restore $Post to the default:
$Post=.See Also
Tech Notes
Related Guides
History
Introduced in 1988 (1.0)
Text
Wolfram Research (1988), $Post, Wolfram Language function, https://reference.wolfram.com/language/ref/$Post.html.
CMS
Wolfram Language. 1988. "$Post." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/$Post.html.
APA
Wolfram Language. (1988). $Post. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/$Post.html
BibTeX
@misc{reference.wolfram_2026_$post, author="Wolfram Research", title="{$Post}", year="1988", howpublished="\url{https://reference.wolfram.com/language/ref/$Post.html}", note=[Accessed: 13-June-2026]}
BibLaTeX
@online{reference.wolfram_2026_$post, organization={Wolfram Research}, title={$Post}, year={1988}, url={https://reference.wolfram.com/language/ref/$Post.html}, note=[Accessed: 13-June-2026]}