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$MessagePrePrint

is a global variable whose value, if set, is applied to expressions before they are included in the text of messages.

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$MessagePrePrint

$MessagePrePrint

is a global variable whose value, if set, is applied to expressions before they are included in the text of messages.

Details

Examples

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Basic Examples  (1)

Have expressions in messages print out in TraditionalForm:

Wolfram Language code: $MessagePrePrint = TraditionalForm;
Wolfram Language code: NDSolve[{x''[t] + x[t, s] == 0, x[0] == x'[0] == 1}, x, {t, 0, 1}]

Restore the default. Now the expressions are shown in StandardForm:

Wolfram Language code: $MessagePrePrint = Automatic; NDSolve[{x''[t] + x[t, s] == 0, x[0] == x'[0] == 1}, x, {t, 0, 1}]

Scope  (2)

Locally define $MessagePrePrint so that expressions sent to messages are shown in a circle:

Wolfram Language code: Block[{$MessagePrePrint = Graphics[{Text[ToString[#], {0, 0}], {Red, Circle[]}}, ImageSize -> 30]&}, Sin[1, 2]]

The local definition does not affect messages outside the Block:

Wolfram Language code: Sin[1, 2]

Make a list of all expressions sent to messages during a computation:

Wolfram Language code: Block[{$MessagePrePrint = Sow}, Reap[Sin[1, 2];LinearSolve[N[{{1, 2}, {1 + $MachineEpsilon, 2}}, {3, 4}]]]]
Wolfram Research (1991), $MessagePrePrint, Wolfram Language function, https://reference.wolfram.com/language/ref/$MessagePrePrint.html.

Text

Wolfram Research (1991), $MessagePrePrint, Wolfram Language function, https://reference.wolfram.com/language/ref/$MessagePrePrint.html.

CMS

Wolfram Language. 1991. "$MessagePrePrint." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/$MessagePrePrint.html.

APA

Wolfram Language. (1991). $MessagePrePrint. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/$MessagePrePrint.html

BibTeX

@misc{reference.wolfram_2026_$messagepreprint, author="Wolfram Research", title="{$MessagePrePrint}", year="1991", howpublished="\url{https://reference.wolfram.com/language/ref/$MessagePrePrint.html}", note=[Accessed: 15-June-2026]}

BibLaTeX

@online{reference.wolfram_2026_$messagepreprint, organization={Wolfram Research}, title={$MessagePrePrint}, year={1991}, url={https://reference.wolfram.com/language/ref/$MessagePrePrint.html}, note=[Accessed: 15-June-2026]}