Thread Subject: Using Time Array Data in ODE Functions

Hi,

I have a function that I pass to ODE45 to solve:

dx = IM_DifferentialEquation(t,x)

but within the function I want to include measured voltage data that is a function of time (time series data). The voltage data is in a 2 column array: column one is time, column 2 is the corresponding voltage value.

What is the simplest way of saying look at voltage array, find time = t, use voltage value corresponding to time t? It must be so simple but I've had a long day and my brain is struggling :(