Mean of parts of an array

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Andrew
Andrew 2014-8-19
编辑： Adam 2014-8-20
Good day to all,
I have searched for an answer can't seem to find it so here goes my description.
I have an array called MeanOfSegments which is 152x1 double (see figure)
I wish to take the mean of parts of this array. This worked great for my first few variables which were consecutive. Here is the successful code I used
if true
% code
MeanVariable1 = mean(MeanOfSegments(1:7));
end
Now I wish to create a variable called MeanVariable2 which is the mean of cell 8,12,13,17. I have tried the following code with no success.
if true
% code
MeanVariable2 = mean(MeanOfSegments(8,12,13,17));
end
Does anyone know how this can be obtained? I am using R2014a
Thanks for any and all help. Andrew

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采纳的回答

Adam
Adam 2014-8-19
Try putting your 8, 12, 13, 17 in square brackets as
MeanVariable2 = mean(MeanOfSegments( [8,12,13,17] ));

更多回答（1 个）

Andrew
Andrew 2014-8-19
Well that was ridiculously easy. Thank you very much for your answer. I'm new to MatLab syntax. Thank you very very much.
  1 个评论
Adam
Adam 2014-8-20
编辑：Adam 2014-8-20
That syntax just means that all your indices are in an array so they can then be used for non-contiguous indexing.
Passing 4 comma delimited numbers in as they are would be interpreted by Matlab as though you are trying to index into a 4-dimensional matrix.
I get used to many of these things just by trying out syntaxes on the command line so you can pick things up quite quickly like that!

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