The two files you will need for HW 3 Problem 1

data_Hw3-tmoment.mat

if you load this file you will find that it contains two vectors
    
 c - concetration at location x=1000m.
 t - times at which concentration is measured


data_Hw3-spacement.mat

This file contains four vectors

time - the times at which the moments were measured.
m0 - the zeroth spatial moment at all times
m1 - the first spatial momet at all times
m2 - the second spatial moment at all times