Finding averages in an array
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1 4 2001 30 29 8 1
2 4 2002 4 5 2 1
2 4 2002 9 6 4 7
2 4 2002 19 14 7 3
2 4 2002 25 21 5 4
2 4 2002 7 18 4 5
2 4 2002 8 3 4 10
2 4 2003 10 27 8 0
Each row represents a match played. Column 6 represents the goals scored by 1 team and column 7 represents the goals scored by the opposition team. How do I find the average number of goals scored per match in the year 2002 (column 3)
Thanks for the help.
采纳的回答
To find the average across all matches
mean(sum(X(:,6:7), 2))
4 个评论
Nobel Mondal
2015-10-15
A small observation. For 2002 only matches -
>> mean(sum(X(X(:,3)==2002,6:7), 2))
Thorsten
2015-10-15
Yes, you're right. I didn't read the question carefully.
Max
2015-10-15
Nobel Mondal
2015-10-16
avgScoreFor2002 = mean(sum(X(X(:,3)==2002,6:7), 2));
sprintf('Average score/match for 2002 : %.4f', avgScoreFor2002)
更多回答（1 个）
Jos (10584)
2015-10-16
As a beginner, you're better of to write out each individual step of the process in detail
Is2002Game = X(:,3)==2002 % true when the 3rd column equals 2002
Goals2002 = X(Is2002Game,[6 7]) % select goals of these matched
TotalScorePer2002Game = sum(Goals2002,2) % sum them per match
TotalScore = sum(TotalScorePer2002Game) % total sum
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