Thread: 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)

Originally Posted by Relmiw

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'.

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.