search for: sensor3sensor4

...or the year 2010, ....). So I have 70 weather stations with one data file per year since 2005. Each station has 4 temperature sensors. Each data file has exactly the same structure: date&hour, sensor1, sensor2, sensor3, sensor4. Here's an example: time sensor1 sensor2 sensor3sensor4 01/01/2008 00:00 -0.25 -2.43 -3.25 -2.37 01/01/2008 00:15 -0.18 -2.37 -3.18 -2.25 01/01/2008 00:30 -0.25 -2.5 -3.37 -2.56 01/01/2008 00:45 -0.25 -2.37 -3.31 -2.37 I need to do a matrix correlation between each same sensors of the different stations (one correlation matrix between all the s...