I am a beginner in the field of lithium-ion battery system research. the Urban Dynamometer Driving Schedule (UDDS) is a specific driving condition of electric vehicle, which is composed of a series of data of speed versus time. Now, I want to use the UDDS to simulate the dynamic discharging process of a series-connected lithium-ion battery pack. How do I convert this data of speed versus time of UDDS into the corresponding data of battery current versus time? For example, in the link, https://github.com/Zhouzihao914/Equivalent_Circuit_Model_Battery/tree/main/udds, how is the udds_curr.mat obtained from the udds.txt.