One common challenge molecular modelers face is ensuring smooth transitions between sequential steps in simulations. Delays often occur when users need to manually select and configure input files from prior runs. In the GROMACS Wizard within the SAMSON molecular design platform, this step has been simplified with the auto-fill feature. If you’ve ever been frustrated by pausing to track down the required GRO file or batch project from previous steps, this tool may save you valuable time.
What is Auto-Fill and Why Use It?
The auto-fill feature in the GROMACS Wizard automatically fetches input paths previously generated by your workflow—be it a GRO file from an NPT Equilibration step or outputs from earlier production molecular dynamics (MD) tasks. This eliminates the need to manually locate and browse files, minimizing errors and making the transition smoother between simulation stages. This is especially helpful when managing projects with multiple dependencies and extensive batch configurations.
Getting Started with Auto-Fill
After completing the NPT Equilibration or similar equilibration step, you will move on to launching a production MD simulation. When you access the Production MD interface, use the auto-fill button (
) as shown below:

Clicking this button will populate the required input field with the appropriate file path from the last successful run, ensuring you continue from exactly where your equilibrated system left off. You don’t have to search for files manually, reducing the possibility of using outdated or incorrect versions.
Additional Input Options
If you prefer not to use auto-fill or have a specific input in mind, you can still manually select your files by clicking the … button next to the input field. This flexibility allows you to customize workflows as needed while still streamlining simpler scenarios with automation features like auto-fill.
Supported inputs include:
- A GRO file from NPT Equilibration or prior production MD steps.
- A batch project that was equilibrated or used in earlier production MD runs, accessible via the Batch Computations guide.
Here’s an example of the auto-fill in action:

Why It Matters
Reliable input configuration is critical to maintaining the integrity of your simulations. By removing manual steps, the auto-fill feature reduces user error and offers a more seamless experience, enabling you to focus on simulation goals rather than administrative tasks. This is especially useful when working with large, complex simulation projects or tight deadlines.
Want to learn more about configuring inputs or running production MD steps? Visit the original documentation page here.
SAMSON and all SAMSON Extensions are free for non-commercial use. You can download SAMSON at https://www.samson-connect.net.
