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x/=c

divides x by c and returns the new value of x.

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Examples  
Basic Examples  
Scope  
Properties & Relations  
Possible Issues  
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DivideBy

x/=c

divides x by c and returns the new value of x.

Details

  • x/=c is equivalent to x=x/c.
  • DivideBy has the attribute HoldFirst.
  • In DivideBy[x,c], x can be a symbol or other expression with an existing value. »

Examples

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Basic Examples  (1)

Wolfram Language code: k = 15; k /= 3
Wolfram Language code: k

Scope  (4)

Divide by a numerical value:

Wolfram Language code: x = 1.5; x /= 2.5;x

Divide by a symbolic value:

Wolfram Language code: v = a;v /= b;v

Divide all values in a list by a scalar:

Wolfram Language code: x = {1, 2, 3}
Wolfram Language code: x /= 2;x

Divide all values in a list by another list:

Wolfram Language code: x /= {10, 20, 30};x

The first argument to DivideBy need not be a symbol:

Wolfram Language code: list = {1, 2, 3}
Wolfram Language code: list[[2]] /= c
Wolfram Language code: list

Properties & Relations  (2)

DivideBy is a short form of this assignment:

Wolfram Language code: k = 8; k = k / 2

TimesBy is closely related:

Wolfram Language code: k = 2; k /= 2
Wolfram Language code: k *= 2

Possible Issues  (1)

A variable to be divided must have an initial value:

Wolfram Language code: x /= 2
Wolfram Research (1988), DivideBy, Wolfram Language function, https://reference.wolfram.com/language/ref/DivideBy.html.

Text

Wolfram Research (1988), DivideBy, Wolfram Language function, https://reference.wolfram.com/language/ref/DivideBy.html.

CMS

Wolfram Language. 1988. "DivideBy." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/DivideBy.html.

APA

Wolfram Language. (1988). DivideBy. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/DivideBy.html

BibTeX

@misc{reference.wolfram_2026_divideby, author="Wolfram Research", title="{DivideBy}", year="1988", howpublished="\url{https://reference.wolfram.com/language/ref/DivideBy.html}", note=[Accessed: 13-June-2026]}

BibLaTeX

@online{reference.wolfram_2026_divideby, organization={Wolfram Research}, title={DivideBy}, year={1988}, url={https://reference.wolfram.com/language/ref/DivideBy.html}, note=[Accessed: 13-June-2026]}