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Taking values out of a vector

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Rohan Savakar
Rohan Savakar 2020-4-16
编辑： Stephen23 2020-4-16
What is the meaning of the following statement?
Where column is a variable with a size of N
column = % some set of values
N = size(column)
column([1 N(1):-1:2])
In general when we use a paranthese infront of the variable name, we are taking the values of the positions in the vector
Using the syntax of
:
we get all the values corresponding to the appropriate row/column,
But what happens when you input an array as shown above in the same parentheses.

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Stephen23
Stephen23 2020-4-16
编辑：Stephen23 2020-4-16
"What is the meaning of the following statement?"
It really is just basic MATLAB operations.
1- The square brackets and the colon operator simply define a vector of these values:
[1,N(1),N(1)-1,N(1)-2,...,4,3,2]
2- that vector of values is used as a index into column.
Assuming that column is a vector, the effect is to access the elements (2:end) of column in reverse order, with the first element still in the first position. It would probably be simpler to use end:
column([1,end:-1:2])

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