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Math Help - why do we use unit vectors for directional derivative?

  1. #1
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    why do we use unit vectors for directional derivative?

    I have been trying to understand why unit vectors are used when calculating directional derivatives. But the answers I found so far go little beyond just stating the fact.
    So why use unit vectors?
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  2. #2
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    Quote Originally Posted by ondo View Post
    I have been trying to understand why unit vectors are used when calculating directional derivatives. But the answers I found so far go little beyond just stating the fact. So why use unit vectors?
    This answer is not going to any more satisfying.
    It is an attempt to make the definition standard.
    “The measure of change as we move off in a unit direction.”
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