---
name: "eneconv"
section: "1"
platform: "linux"
package: "gromacs-data"
version: "5.0.2-1"
release: "Debian 8 (Jessie)"
platforms: ["linux"]
url: "https://new.carta.tech/gmx-eneconv"
---

# eneconv(1)

Convert energy files

Part of [gmx-eneconv(1)](/gmx-eneconv/1.md).

## NAME

gmx-eneconv - Convert energy files

## SYNOPSIS

gmx eneconv \[-f \[\<.edr\> \[...\]\]\] \[-o \[\<.edr\>\]\] \[-nice \<int\>\]\
             \[-b \<real\>\] \[-e \<real\>\] \[-dt \<real\>\] \[-offset \<real\>\]\
             \[-\[no\]settime\] \[-\[no\]sort\] \[-\[no\]rmdh\] \[-scalefac \<real\>\]\
             \[-\[no\]error\]

## DESCRIPTION

With *multiple files* specified for the **-f** option: Concatenates several energy files in sorted order. In the case of double time frames, the one in the later file is used. By specifying **-settime** you will be asked for the start time of each file. The input files are taken from the command line, such that the command **gmx eneconv -f \*.edr -o fixed.edr** should do the trick.

With *one file* specified for **-f**: Reads one energy file and writes another, applying the **-dt**, **-offset**, **-t0** and **-settime** options and converting to a different format if necessary (indicated by file extentions).

**-settime** is applied first, then **-dt**/**-offset** followed by **-b** and **-e** to select which frames to write.

## OPTIONS

Options to specify input and output files:

**-f** *\[\<.edr\> \[...\]\] (ener.edr) (Input)*\
     Energy file

**-o** *\[\<.edr\>\] (fixed.edr) (Output)*\
     Energy file

Other options:

**-nice** *\<int\> (19)*\
     Set the nicelevel

**-b** *\<real\> (-1)*\
     First time to use

**-e** *\<real\> (-1)*\
     Last time to use

**-dt** *\<real\> (0)*\
     Only write out frame when t MOD dt = offset

**-offset** *\<real\> (0)*\
     Time offset for **-dt** option

**-\[no\]settime**  *(no)*\
     Change starting time interactively

**-\[no\]sort**  *(yes)*\
     Sort energy files (not frames)

**-\[no\]rmdh**  *(no)*\
     Remove free energy block data

**-scalefac** *\<real\> (1)*\
     Multiply energy component by this factor

**-\[no\]error**  *(yes)*\
     Stop on errors in the file

## KNOWN ISSUES

\- When combining trajectories the sigma and E2 (necessary for statistics) are not updated correctly. Only the actual energy is correct. One thus has to compute statistics in another way.

## SEE ALSO

**[gromacs(7)](/gromacs/7.md)**

More information about **GROMACS** is available at \<*http://www.gromacs.org/*\>.