question

• To: mathgroup at smc.vnet.net
• Subject: [mg80130] question
• From: Ivan Egorov <egorov at bgu.ac.il>
• Date: Mon, 13 Aug 2007 04:35:22 -0400 (EDT)

```Hello, I have 2 questions.

I need to write a function maxima[lis_List] which, given a list of numbers,
produces a list of those numbers greater than all those that precede
them. For example maxima[{ 9, 2, 10, 3, 14, 9}] returns { 9, 10, 14}.
You need to use recursion, pattern matching, Select and Join.
I also need to write a function derivList[f, x, n_Integer] that returns the list
of first n derivatives of themathematical function f (x ) , that is,
{ f ( x ) , f ' ( x ) , f ' ' ( x ) ,..., f n(x )} . Then, operate
your derivList implementation on Exp[-x] Sin[x] to generate the list
of derivatives up to the fifth one (that is, returning {f ( x)  ,
f ' ( x ) ,..., f (5)  (x )}). Use Plot to plot the results for the
range 0<=x<=10 . Use the PlotStyle option to generate a different color
for each curve.

I realy don't understand  what they want in second question.

Thanks.

I hope that now is readable.

```

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