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• Cancel

cancelElement

Element functions can be customized with set and show rules.

Displays a diagonal line over a part of an equation.

This is commonly used to show the elimination of a term.

Example

Here, we can simplify:
$ (a dot b dot cancel(x)) /
    cancel(x) $

Parameters

Parameters are the inputs to a function. They are specified in parentheses after the function name.

body

content

RequiredPositional

Positional parameters are specified in order, without names.

The content over which the line should be placed.

length

relative

Settable

Settable parameters can be customized for all following uses of the function with a set rule.

The length of the line, relative to the length of the diagonal spanning the whole element being "cancelled". A value of 100% would then have the line span precisely the element's diagonal.

Default: 100% + 3pt

View example

$ a + cancel(x, length: #200%)
    - cancel(x, length: #200%) $

inverted

bool

Settable

Settable parameters can be customized for all following uses of the function with a set rule.

Whether the cancel line should be inverted (flipped along the y-axis). For the default angle setting, inverted means the cancel line points to the top left instead of top right.

Default: false

View example

$ (a cancel((b + c), inverted: #true)) /
    cancel(b + c, inverted: #true) $

cross

bool

Settable

Settable parameters can be customized for all following uses of the function with a set rule.

Whether two opposing cancel lines should be drawn, forming a cross over the element. Overrides inverted.

Default: false

View example

$ cancel(Pi, cross: #true) $

angle

auto or angle or function

Settable

Settable parameters can be customized for all following uses of the function with a set rule.

How much to rotate the cancel line.

• If auto, the line assumes the default angle; that is, along the diagonal line of the content box.
• If given an angle, the line is rotated by that angle clockwise w.r.t the y-axis.
• If given a function angle => angle, the line is rotated by the angle returned by that function. The function receives the default angle as its input.

Default: auto

View example

$ cancel(Pi)
  cancel(Pi, angle: #0deg)
  cancel(Pi, angle: #45deg)
  cancel(Pi, angle: #90deg)
  cancel(1/(1+x), angle: #(a => a + 45deg))
  cancel(1/(1+x), angle: #(a => a + 90deg)) $

stroke

length or color or gradient or stroke or pattern or dictionary

Settable

Settable parameters can be customized for all following uses of the function with a set rule.

How to stroke the cancel line.

Default: 0.5pt

View example

$ cancel(
  sum x,
  stroke: #(
    paint: red,
    thickness: 1.5pt,
    dash: "dashed",
  ),
) $

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