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Math Help - Error when typing derivative into TI 89

  1. #1
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    Error when typing derivative into TI 89

    I've been able to do this before, but for some reason this isn't working.

    d(x^3 - 2x + 4,x)

    i get "Error: Dimension"

    does anyone have any ideas as to why?
    i also get the same error if i try

    (integral) S(2x,x)
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  2. #2
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    Quote Originally Posted by Relmiw View Post
    I've been able to do this before, but for some reason this isn't working.

    d(x^3 - 2x + 4,x)

    i get "Error: Dimension"

    does anyone have any ideas as to why?
    i also get the same error if i try

    (integral) S(2x,x)
    Has x previously been defined to be anything else eg. a matrix? If so, you will need to 'clear a-z'.
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  3. #3
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    ah, ok. i had x stored as a matrix, didn't know it was a problem to do that, and didn't know about the "clear a-z" option

    i've got it figured out now though, thank you.
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