# Passing multiple Control Inputs to a Continuous data driven problem

**URL:** <https://discourse.julialang.org/t/passing-multiple-control-inputs-to-a-continuous-data-driven-problem/104617>\
**Category:** General Usage\
**Created:** [October 5, 2023, 3:14pm UTC](https://discourse.julialang.org/t/passing-multiple-control-inputs-to-a-continuous-data-driven-problem/104617 "2023-10-05T15:14:15Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Harry\_Armstrong](https://avatars.discourse-cdn.com/v4/letter/h/839c29/32.png) [@Harry\_Armstrong](https://discourse.julialang.org/u/Harry_Armstrong)\
**Post date:** [October 5, 2023, 3:14pm UTC](https://discourse.julialang.org/t/passing-multiple-control-inputs-to-a-continuous-data-driven-problem/104617/1 "2023-10-05T15:14:16Z")

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I’ve recently been working with the DataDrivenDiffEq.jl package to implement system identification on non linear systems and have run into a bit of a road block. The model I’m trying to identify takes two control inputs and although there is plenty of documentation showing how to pass a single control input to the ContinuousDataDrivenProblem function I cannot find any that describes how one would pass two or more inputs. Does anyone know how

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**Author:** ![Harry\_Armstrong](https://avatars.discourse-cdn.com/v4/letter/h/839c29/32.png) [@Harry\_Armstrong](https://discourse.julialang.org/u/Harry_Armstrong)\
**Post date:** [October 9, 2023, 4:31pm UTC](https://discourse.julialang.org/t/passing-multiple-control-inputs-to-a-continuous-data-driven-problem/104617/2 "2023-10-09T16:31:13Z")

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Managed to fix the issue by passing the control values as a matrix of control inputs of the form C x N where C is the number of separate control signals and N is the number of total inputs to the system e.g.: if you had a system with 2 control inputs that ran for 40 seconds and was sampled every 0.01 seconds C would be 2 and N would be 4000. Couldn’t get the ContinuousDataDrivenProblem function to take a function that generated multiple outputs as it kept generating arrays of the type any instead of float64.