(New page: Category: ECE Category: ECE 301 Category: Fall Category: 2007 Category: mboutin Category: Matlab Category: Examples ==The Best Way== The best way to reverse a ...) |
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Latest revision as of 13:00, 18 December 2008
The Best Way
The best way to reverse a vector is probably as follows:
Say we have a vector,
- test = [1,2,3,4,5]
and we want to reverse the numbers to provide us with a new vector:
- newVector = [5,4,3,2,1]
To accomplish this without using a while loop or for loop, we can simply use the variable 'end', that is predefined in matlab:
- newVector = test(end:-1:1)
What this statement say is take the last element of test ('end'), place that in the first element of newVector, then take the next last element of test ('end - 1') and put it into the second element of newVector, and so on, until newVector is a reversed copy of test. This method works with both row and column vectors.
Other Ways
Use the function flipud(vector) to reverse a column vector quickly.
- >> flipud([1;2;3])
- ans =
- 3
- 2
- 1
- ans =
Use the function fliplr(vector) to reverse a row vector quickly.
- >> fliplr([1,2,3])
- ans =
- 3 2 1
- ans =