Hermite interpolation and pchipd method

1) Anyone know how to show derivates direction on plot using pchipd?
2) My prof. said me to create a method that could implementate Hermite global interpolation but I don't understand what he means. I used pchipd method to local interpolation but what i should do for global and is it possible to extend this method to curves?

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2013-11-21

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2013-11-21

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