The phrase "add a function" is correct and usable in written English.
You can use it when discussing programming, software development, or any context where you are incorporating a new feature or capability into a system or application.
Example: "To improve the user experience, we need to add a function that allows users to save their progress."
Alternatives: "include a feature" or "implement a method".
When it retools the Web site for a mobile audience, People will add a function that places banner ads at the top and bottom of the cellphone screen when pages are accessed on a palm-size device.
Philips recently set off a buzz in the blogosphere when he discovered hints in Facebook's API that seem to suggest that the company plans to add a function that could allow users to customize their lists of friends.
The vehicle dynamics model of tractor with tandem suspension is modeled and simulated in dynamics software ADAMS, which is redeveloped to add a function of automatic parametric modeling and simulation.
However, since P E is given as an efficient presentation, we also need to add a function related to its efficiency.
We are going to evaluate this model by comparing the number of hearings of the events with the predictions of our model and verify if the assumption of linear relationship will survive, or we may need to add a function to account for the relationship of the number hearing and event attributes to our model.
We improve DISpro to allow users to set different thresholds to trade off the specificity and sensitivity of disorder predictions and to add a function for the visualization of protein disorder prediction.
Monty draws up a plan, recommends plants … and then watches as his advisee fails to follow his advice to simplify and decides, instead, to add a functioning waterfall.
The CEO also says that if a future version of the Apple Watch does include GPS, the app will be ready at that time to add a mapping function.
He has added a function that lets bar owners make changes to their page on his site.
We've added a function to the umbrella, and we've added a signature and recognition to it.
Last year, Bloomberg added a function that allows players to download video so they can watch it in places where Wi-Fi is unavailable, like on a plane.
