[OS X TeX] Re: "! LaTeX Error: No counter 'a' defined."
Michael Sharpe
msharpe at ucsd.edu
Mon Dec 20 23:46:56 EST 2010
On Dec 20, 2010, at 8:06 PM, John B. Thoo wrote:
> Thank you, Herb S and Don G D, for your replies.
>
> On Dec 19, 2010, at 12:00 PM, <macosx-tex-request at email.esm.psu.edu> <macosx-tex-request at email.esm.psu.edu> wrote:
>
>> ------------------------------
>>
>> Message: 4
>> Date: Sat, 18 Dec 2010 20:14:59 -0600
>> From: Herbert Schulz <herbs at wideopenwest.com>
>>
>> Well, it looks like something in that chapter is a culprit do you're making some progress.
>
> Reminiscent of trying to pin down a control panel conflict in ye ole Mac operating systems, I divided the suspect file "ch_numthry.tex" into two parts, A1 and B1, and typeset with only one part. If only B1 caused errors, e.g., then I divided B1 into two parts, A2 and B2, and typeset with only one part. Continuing in this way, I narrowed down this piece of code that causes the errors:
>
> %%%%%%%%%%%%%%%%%%%% begin rogue code %%%%%%%%%%%%%%%%%%%%%%%
> \begin{figure}
> \subfigure[Spiral in Fibonacci rectangles.]{%
> \begin{tikzpicture}
> \pgftransformscale{0.4}
> % \draw[very thin,color=gray] (0,0) grid (15,10);
> \draw[color=lightgray] (10,6) rectangle (11,7);
> \draw[color=lightgray] (9,6) rectangle (10,7);
> \draw[color=lightgray] (9,7) rectangle (11,9);
> \draw[color=lightgray] (11,6) rectangle (14,9);
> \draw[color=lightgray] (9,1) rectangle (14,6);
> \draw[color=lightgray] (1,1) rectangle (9,9);
>
> \draw (11,7) arc (0:-90:1);
> \draw (10,6) arc (-90:-180:1);
> \draw (9,7) arc (180:90:2);
> \draw (11,9) arc (90:0:3);
> \draw (14,6) arc (0:-90:5);
> \draw (9,1) arc (-90:-180:8);
> \end{tikzpicture}
> }
> \qquad
> \subfigure[Golden spiral.]{%
> %% Modified code copied from
> %% <http://www.texample.net/tikz/examples/fibonacci-spiral/>
> %%
> \begin{tikzpicture}%[background rectangle/.style={fill=black},
> % show background rectangle]
> \pgftransformscale{0.35}
> % Create some counters for holding the Fibonacci numbers
> \newcounter{a}
> \newcounter{b}
> \newcounter{temp}
>
> % Initialize the counters
> \setcounter{a}{0}
> \setcounter{b}{1}
>
> % The spiral will start at the origin
> \coordinate (0) at (0,0);
>
> % This loop defines the number of turns in the spiral. Note that we
> % will have to be careful not to overflow our counters or make the
> % spiral too large for TeX to handle. This is easy to do as the
> % Fibonacci sequence grows exponentially.
> \foreach \i in {1,...,18}
> {
> % Get the "name" of the last point on the spiral
> \pgfmathsetmacro{\lastpoint}{\i-1}
>
> % Compute the angle for this turn of the spiral
> % \pgfmathsetmacro{\startangle}{mod(\i-1,4) * 90}
> \pgfmathsetmacro{\startangle}{mod(\i-1,4) * -90}
>
> % Draw this turn of the spiral and remember the point where we end
> % \draw[white] (\lastpoint) arc
> \draw (\lastpoint) arc
> % (\startangle : \startangle + 90 : \value{b}/10.0pt) coordinate (\i);
> (\startangle : \startangle - 90 : \value{b}/10.0pt) coordinate (\i);
>
> % Compute the next Fibonacci number
> \setcounter{temp}{\value{b}}
> \addtocounter{b}{\value{a}}
> \setcounter{a}{\value{temp}}
> }
>
> % Add some framing for the spiral while at the same time not "boxing"
> % it in. Note that to put a square around each turn of the spiral we
> % could have just used the command \draw[white] (\lastpoint)
> % rectangle (\i); after drawing each turn in the loop above.
> \foreach \i in {1,3,...,17}
> {
> \pgfmathsetmacro{\lastpoint}{\i-1}
> % \draw[white] (\lastpoint) -| (\i);
> \draw[color=lightgray] (\lastpoint) -| (\i);
> }
>
> \foreach \i in {2,4,...,16}
> {
> \pgfmathsetmacro{\lastpoint}{\i-1}
> % \draw[white] (\lastpoint) |- (\i);
> \draw[color=lightgray] (\lastpoint) |- (\i);
> }
>
> % \draw[white] (17) -- (17 |- 18);
> \draw[color=lightgray] (17) -- (17 |- 18);
>
> % % Add some text displaying the formula for the Fibonacci numbers
> % \node(eq) at ($(18) + (2.5,1)$)
> % [white,text width = 2cm,font=\fontsize{8}{8}\selectfont] {
> % \begin{displaymath}
> % f(n) = \left\{
> % \begin{array}{lr}
> % 0 & \text{~~if } n = 0\\
> % 1 & \text{~~if } n = 1\\
> % f(n-1) + f(n-2) & \text{~~if } n \geq 2\\
> % \end{array}
> % \right.
> % \end{displaymath}
> % };
> \end{tikzpicture}
> }
> \caption{A spiral drawn inside Fibonacci rectangles and a golden spiral drawn inside golden rectangles.}
> \label{fig.numthry:goldenspiral}
> \end{figure}
> %%%%%%%%%%%%%%%%%%%% end rogue code %%%%%%%%%%%%%%%%%%%%%%%
>
> Recall that the errors were
>
> ! LaTeX Error: No counter 'a' defined.
>
> ! LaTeX Error: No counter 'b' defined.
>
> ! LaTeX Error: No counter 'temp' defined.
>
> Also recall that in the preamble I declare
>
> \usetikzlibrary{decorations.pathreplacing} % load tikz decorations library
> \usetikzlibrary{calc} % load the tikz calc library
>
> But I do not know how to fix the code. Any suggestions on fixing this piece of code would be appreciated. Thanks.
>
>
>> ------------------------------
>>
>> Message: 7
>> Date: Sat, 18 Dec 2010 20:33:40 -0700
>> From: Don Green Dragon <fergdc at Shaw.ca>
>>
>> According to George Gratzer's book "More Math into LaTeX", on page 4 he states:
>>
>> "The name of a LaTeX source file should be one word (no spaces, no special characters), and end with .tex."
>>
>>> From your error messages, it appears that you have a source file (for example) <ch.geom.tex> (without < and >) and that first occurrence of '.' may be the culprit. Each of the error messages appears to be complaining about an \include line.
>>
>> Did you try the suggestion made by Ross Moore?
>
> I replaced all the extra '.' in the filenames with '_'. So, e.g., "ch.numthry.tex" is now "ch_numthry.tex". Thanks.
>
> Thank you all again.
>
> ---John.
Your code worked without problems for me. Perhaps you need to update all your packages with TeX Live Manager.
Michael
More information about the MacOSX-TeX
mailing list