max element in vector

This is a discussion on max element in vector within the C++ Programming forums, part of the General Programming Boards category; Hello, is it possible to use the stl MAX_ELEMENT algorithm to find the max value in a vector of vectors. ...

  1. #1
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    max element in vector

    Hello,

    is it possible to use the stl MAX_ELEMENT algorithm to find the max value in a vector of vectors.
    Say I have the following 5 x 3 matrix represented in a vec. of vec.

    1 4 5
    3 5 8
    2 9 5
    8 0 2
    3 4 7

    where each row is a vector, so we have 5 vectors within a vector.

    I want to find the MAX_ELEMENT along the 1st, 2nd or 3rd column.
    For the 1st one the result is 8, the 2nd is 9, the 3rd is 8.

    any idea?

    thanks

  2. #2
    C++ Witch laserlight's Avatar
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    Well, iterate over each column and apply max_element.

  3. #3
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    You'd have to define a custom iterator which iterates through each row. It would be a lot less work to just forego the max_element algorithm alltogether.
    Callou collei we'll code the way
    Of prime numbers and pings!

  4. #4
    Cat without Hat CornedBee's Avatar
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    Not if you use a Boost iterator adaptor and a Lambda object. Then it becomes a matter of 10 minutes, if you have to look up the documentation.
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
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