---
name: "plsdidev"
section: "3plplot"
platform: "linux"
package: "plplot-doc"
version: "5.15.0+dfsg2-15"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/plsdidev"
---

# plsdidev(3plplot)

Set parameters that define current device-space window

## NAME

**plsdidev** - Set parameters that define current device-space window

## SYNOPSIS

**plsdidev**(*mar*, *aspect*, *jx*, *jy*)

## DESCRIPTION

Set relative margin width, aspect ratio, and relative justification that define current device-space window.  If you want to just use the previous value for any of these, just pass in the magic value PL\_NOTSET. It is unlikely that one should ever need to change the aspect ratio but it's in there for completeness. If [**plsdidev**(3plplot)](/plsdidev/3plplot.md) is not called the default values of *mar*, *jx*, and *jy* are all 0. *aspect* is set to a device-specific value.

Redacted form: **plsdidev(mar, aspect, jx, jy)**

This function is used in example 31.

## ARGUMENTS

- *mar* (**PLFLT**(3plplot), input)

  Relative margin width.

- *aspect* (**PLFLT**(3plplot), input)

  Aspect ratio.

- *jx* (**PLFLT**(3plplot), input)

  Relative justification in x. Value must lie in the range -0.5 to 0.5.

- *jy* (**PLFLT**(3plplot), input)

  Relative justification in y. Value must lie in the range -0.5 to 0.5.

## AUTHORS

Many developers (who are credited at http://plplot.org/credits.php) have contributed to PLplot over its long history.

## SEE ALSO

PLplot documentation at http://plplot.org/documentation.php.