# First difference in dynare and matlab

**URL:** <https://forum.dynare.org/t/first-difference-in-dynare-and-matlab/755>\
**Category:** Dynare help (legacy posts)\
**Created:** [23 July 2008 12:46 UTC](https://forum.dynare.org/t/first-difference-in-dynare-and-matlab/755 "2008-07-23T12:46:21Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![system](https://forum.dynare.org/uploads/default/original/2X/8/8c31d20077f015ac0c48df5777b4fc49531c21e8.png) [@system](https://forum.dynare.org/u/system)\
**Post date:** [23 July 2008 12:46 UTC](https://forum.dynare.org/t/first-difference-in-dynare-and-matlab/755/1 "2008-07-23T12:46:21Z")

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hello ,  
i need to write first difference in my program (ie ('delta(x)=xt-xt(-1)), which function in matlab correspond to it?

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**Author:** ![reubenpjacob](https://forum.dynare.org/letter_avatar_proxy/v4/letter/r/e5b9ba/32.png) [@reubenpjacob](https://forum.dynare.org/u/reubenpjacob)\
**Post date:** [25 July 2008 06:48 UTC](https://forum.dynare.org/t/first-difference-in-dynare-and-matlab/755/2 "2008-07-25T06:48:11Z")

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diff( x )