Vertical spacing for chapter headings

[Bradley Navarro]

I have been trying to find a way to change the spacing between the top 
of the page and the chapter number, between the chapter number and 
chapter title, and the spacing after the chapter title.

For example,

[2 inches]
CHAPTER 1
[1.6 cm]
INTRODUCTION
[1.6 cm]
I have used the code (from Herbert's tip page) and have solved a few of 
the errors (I think). Below is the code:

\makeatletter
\usepackage{calc}
\newlength{\topspace}
\setlength{\topspace}{2in 
   -\topmargin  
   -\headheight       
   -\headsep          
   -\topskip}         
[EMAIL PROTECTED]
\vspace*{\topspace}
{\parindent \z@ \raggedright \normalfont
  \ifnum [EMAIL PROTECTED] >[EMAIL PROTECTED]
    [EMAIL PROTECTED]
      \huge\bfseries [EMAIL PROTECTED] \thechapter
      \par\nobreak
      \vskip 20\p@
    \fi
  [EMAIL PROTECTED]
  \Huge \bfseries #1\par\nobreak
  \vskip 20\p@
}
}
\makeatother



However I still get the following error message:
Undefined control sequence.
\chapter{INTRODUCTION}
The control sequence at the end of the top line
of your error message was never \def'ed.
I do not know what the problem is. It is imperative that I get this code 
to work as it is necessary for a thesis. If anyone can help, please do so.

Thanks,
Brad