"Index exceeds the number of array elements (217)"

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Why does MATLAB show me the following error?
"Index exceeds the number of array elements (217)"
I am trying to find the mean for different rows in 1 column and I have 217 rows. I used the following code:
mean(RT([8 12 25 28 30 39 40 48 52 56 58 59 60 63 70 72 97 100 101 102 105 122 123 478 131 132 143 150 164 181 186 191 198 199 211:217,1]))
Why isn't it letting me carry out this function?

Accepted Answer

Jeremy
Jeremy on 10 Dec 2019
Edited: Jeremy on 10 Dec 2019
If you have 217 rows and you're trying to index row 478 then Matlab will throw an error
also, the ,1 will need to be outside the row bracket.
mean(RT([8 12 25 28 30 39 40 48 52 56 58 59 60 63 70 72 97 100 101 102 105 122 123 478 131 132 143 150 164 181 186 191 198 199 211:217],1))

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