How to Calculate the Average of the Third Column in a Text File Using Matlab?

[davidhedoesit]

I want to create a Matlab script called hw11.m, which reads in a text file of weather
information, parses it, and writes formatted summary information. The textfile is called
MonthlyHistory.html
I cannot figure out how to write a loop that averages the third set of numbers in the string.
an example is the bold number ..ect
2015-10-1,33,27,20,29,24,20,96,85,70,30.51,30.40,30.13,10,9,4,10,6,,T,5,Snow,35

fid = fopen('MonthlyHistory.html');
str = fgets(fid); 

for (i=1:1:31)
  a = sscanf(str,'%s')end

the .html file is

2015-10-1,33,27,20,29,24,20,96,85,70,30.51,30.40,30.13,10,9,4,10,6,,T,5,Snow,35
2015-10-2,37,32,27,32,27,23,92,80,67,30.35,30.31,30.28,10,10,7,7,4,,T,8,Rain-Snow,19
2015-10-3,39,36,32,35,33,29,100,90,79,30.30,30.17,30.11,10,7,0,8,3,,0.21,8,Fog-Rain,13
2015-10-4,40,37,34,38,36,33,100,96,92,30.23,30.19,30.14,2,1,0,6,0,,0.13,8,Fog-Rain,27
2015-10-5,46,38,30,38,34,30,100,91,61,30.19,30.08,29.93,10,7,0,6,2,,T,6,Fog-Rain,23
2015-10-6,47,37,26,33,29,25,96,82,44,29.92,29.88,29.83,10,10,10,6,1,,0.00,3,,42
2015-10-7,46,36,25,31,27,23,89,73,44,29.83,29.79,29.74,10,10,10,8,4,,0.00,5,,36
2015-10-8,49,39,29,29,26,24,75,61,35,29.74,29.56,29.44,10,10,10,15,9,,0.00,6,,32
2015-10-9,45,38,31,26,24,21,75,58,34,29.43,29.24,29.06,10,10,10,20,9,,0.00,6,,22
2015-10-10,38,33,28,26,21,18,73,62,45,29.21,29.10,29.05,10,10,9,13,9,,T,5,Rain,29
2015-10-11,50,38,26,26,23,20,78,60,26,29.32,29.27,29.22,10,10,10,10,7,,0.00,2,,25
2015-10-12,36,29,22,24,21,17,85,70,49,29.39,29.25,29.21,10,10,10,10,5,,0.00,3,,38
2015-10-13,35,28,21,23,21,18,92,77,44,29.94,29.66,29.41,10,10,10,5,2,,0.00,4,,27
2015-10-14,38,31,23,26,24,21,89,76,53,30.22,30.13,29.96,10,10,10,4,1,,0.00,6,,71
2015-10-15,46,33,19,29,23,17,92,77,41,30.22,30.08,29.90,10,10,10,7,2,,0.00,2,,37
2015-10-16,47,35,23,31,25,19,85,68,31,29.88,29.61,29.36,10,10,10,13,7,,0.01,5,Rain-Snow,38
2015-10-17,38,36,34,34,32,29,92,82,63,29.41,29.31,29.25,10,10,7,12,8,,0.13,8,Rain,16
2015-10-18,48,39,30,38,33,29,100,91,68,29.61,29.51,29.41,10,6,0,8,2,,T,5,Fog-Rain-Snow,161
2015-10-19,35,32,28,32,31,29,96,93,84,29.83,29.75,29.61,6,2,0,8,1,,0.14,8,Fog-Rain-Snow,47
2015-10-20,41,33,24,34,27,22,96,85,68,29.79,29.67,29.53,10,8,0,9,3,,T,4,Fog,15
2015-10-21,38,32,25,29,25,20,89,78,63,29.61,29.54,29.51,10,10,10,12,6,,0.00,6,,22
2015-10-22,34,32,30,27,24,22,85,71,55,29.84,29.72,29.62,10,10,10,9,5,,0.00,7,,360
2015-10-23,41,33,25,27,25,20,89,77,53,29.89,29.86,29.83,10,10,10,8,2,,0.00,5,,42
2015-10-24,36,30,24,25,21,19,81,73,59,29.83,29.77,29.71,10,10,10,9,6,,0.00,4,,45
2015-10-25,37,30,23,27,22,19,88,79,60,30.07,30.01,29.84,10,10,10,5,1,,0.00,4,,35
2015-10-26,33,28,23,29,25,20,92,87,79,30.08,30.00,29.90,10,10,10,5,1,,0.00,7,,56
2015-10-27,36,33,29,30,28,27,89,84,71,29.89,29.75,29.58,10,10,10,7,3,,0.00,7,,33
2015-10-28,34,29,23,26,23,20,92,78,55,29.57,29.45,29.39,10,10,10,8,4,,0.00,6,,18
2015-10-29,30,25,20,27,23,18,96,88,69,29.41,29.39,29.36,10,5,1,9,5,,0.07,8,Snow,339
2015-10-30,25,23,20,21,19,17,96,88,78,29.73,29.54,29.40,8,3,2,8,1,,0.13,8,Snow,339
2015-10-31,20,10,-1,17,9,-2,96,86,77,30.04,29.93,29.72,10,8,2,9,4,,0.01,5,Snow,308

 

[Joppy]

It's the third column of the matrix defined by the .html file. So

mean(data[,3])

ought to do it, assuming data is the contents of the .html.