From evananthony13@gmail.com  Wed Jun  6 02:11:02 2012
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Date: Wed, 6 Jun 2012 02:10:54 -0400
Message-ID: <CAHg3kqgv4QzghqdABH=G31HYgFtVJRNYR-LFmn-XjK7wb6qrdQ@mail.gmail.com>
Subject: possible error in the online primer
From: Evan armbrister <evananthony13@gmail.com>
To: shasha@courant.nyu.edu
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Dennis,

          Hello, I was going through your online primer course to acquire
some tools to tackle the home work and I may have found an error.  "var" is
an assigned function name within "q", therefore you cannot define a new
function with letters ordered "var".  I may be wrong but it kept giving me
an "asign" error message.

Thank you for letting me take the class, the jumpstart I am experiencing is
priceless.



Evan


Now we resume our exploration of other functionality. Suppose we want to
create a basic set of statistical procedures: average, variance, standard
deviation, and correlation.
Examples H: Statistical functions *var:{[x] (avg[x*x]) -
(avg[x])*(avg[x])}*std:{[x] sqrt[var[x]]} a: 4 3 6 13 1 32 8 std[a] /
returns 9.839529

The built in primitives avg and sqrt are joined by other familiar ones:
log exp count sum prd min max

There are also two nice string operators:
like ss

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<span class=3D"Apple-style-span" style=3D"font-family:verdana;font-size:13p=
x"><p>Dennis,</p><p>=A0 =A0 =A0 =A0 =A0 Hello, I was going through your onl=
ine primer course to acquire some tools to tackle the home work and I may h=
ave found an error. =A0&quot;var&quot; is an assigned function name within =
&quot;q&quot;, therefore you cannot define a new function with letters orde=
red &quot;var&quot;. =A0I may be wrong but it kept giving me an &quot;asign=
&quot; error message. =A0</p>
</span><font class=3D"Apple-style-span" face=3D"verdana"><br></font><span c=
lass=3D"Apple-style-span" style=3D"font-family:verdana;font-size:13px"><p>T=
hank you for letting me take the class, the jumpstart I am experiencing is =
priceless.</p>
<p><br></p><p><br></p><p>Evan</p><p><br></p><p>Now we resume our exploratio=
n of other functionality. Suppose we want to create a basic set of statisti=
cal procedures: average, variance, standard deviation, and correlation.</p>
Examples H: Statistical functions
<b>var:{[x] (avg[x*x]) - (avg[x])*(avg[x])}</b>
std:{[x] sqrt[var[x]]}
a: 4 3 6 13 1 32 8
std[a] / returns 9.839529
<p>The built in primitives avg and sqrt are joined by other familiar ones:<=
/p>log exp count sum prd min max
<p>There are also two nice string operators:</p>like ss=20
<div><br></div></span>

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