You can use the option `mathescape` for your environment which gives you the ability to use the normal latex behavior of the $-signs. Try:

    \begin{lstlisting}[mathescape]
    ...
    \end{lstlisting}

For more info, take a look into the `listings` [package manual][1].


  [1]: http://ctan.org/tex-archive/macros/latex/contrib/listings/

I was wondering how Java orders items in the `Map` (`HashMap` or `Hashtable`) when they are added. Are the keys ordered by the hashcode, memory reference or by allocation precedence...?

It&#39;s because I&#39;ve noticed same pairs in the `Map` are not always in the same order

How does Java order items in a HashMap or a HashTable?

I currently have the latest version of my code on another computer that I want to develop from (Home computer and laptop for when I&#39;m out and about) I set up heroku for my app on my laptop. Now I need to associate my code on my desktop so that I can push to heroku from there as well.

This is what I get from my desktop:

    desktop:~/NetBeansProjects/onlinescheduler$ git pull heroku master
    fatal: &#39;heroku&#39; does not appear to be a git repository
    fatal: The remote end hung up unexpectedly

I can&#39;t do `heroku create` because that will create a separate app. How do I associated the existing code with (or pull down a brand new version from) heroku?

Whats the command to do this?

How can I pull an existing heroku app to new location for development?

I have a problem with LaTeX – I don&#39;t know how to put mathematical equations and symbols in listings. I use the `listings` package and it&#39;s offers great looking listings, but it doesn&#39;t allow math symbols in `$ ... $`. Another package, `algorithms`, allows math, but listings doesn&#39;t look as good as with `listings` (the problem is that `algorithms` demands to get new line after every `if`, `then`, etc.)

Math symbols in listings

<p>I have a problem with LaTeX – I don't know how to put mathematical equations and symbols in listings. I use the <code>listings</code> package and it's offers great looking listings, but it doesn't allow math symbols in <code>$ ... $</code>. Another package, <code>algorithms</code>, allows math, but listings doesn't look as good as with <code>listings</code> (the problem is that <code>algorithms</code> demands to get new line after every <code>if</code>, <code>then</code>, etc.)</p>


I was always wondering how I can make a function which calculates the power (e.g. 2&lt;sup&gt;3&lt;/sup&gt;) myself. In most languages these are included in the standard library, mostly as `pow(double x, double y)`, but how can I write it myself?

I was thinking about `for loops`, but it think my brain got in a loop (when I wanted to do a power with a non-integer exponent, like 5&lt;sup&gt;4.5&lt;/sup&gt; or negatives 2&lt;sup&gt;-21&lt;/sup&gt;) and I went crazy ;)

So, how can I write a function which calculates the power of a real number? Thanks

---
Oh, maybe important to note: I cannot use functions which use powers (e.g. `exp`), which would make this ultimately useless.

How can I write a power function myself?

Using GDAL in Python, how do you get the latitude and longitude of a GeoTIFF file?

GeoTIFF&#39;s do not appear to store any coordinate information.  Instead, they store the XY Origin coordinates.  However, the XY coordinates do not provide the latitude and longitude of the top left corner and bottom left corner.

It appears I will need to do some math to solve this problem, but I don&#39;t have a clue on where to start.

What procedure is required to have this performed?

I know that the `GetGeoTransform()` method is important for this, however, I don&#39;t know what to do with it from there.

Obtain Latitude and Longitude from a GeoTIFF File

I am looking for a free C++ fixed point library (Mainly for use with embedded devices, not for arbitrary precision math). Basically, the requirements are:

* No unnecessary runtime overhead: whatever can be done at compile time, should be done at compile time.
* Ability to transparently switch code between fixed and floating point, with no inherent overhead.
* Fixed point math functions. There&#39;s no much point using fixed point if you need to cast back and forth in order to take a square root.
* Small footprint.

Any suggestions?

C++ fixed point library?

I was trying to normalize a set of numbers from -100 to 0 to a range of 10-100 and was having problems only to notice that even with no variables at all, this does not evaluate the way I would expect it to:

    &gt;&gt;&gt; (20-10) / (100-10)
    0

Float division doesn&#39;t work either:

    &gt;&gt;&gt; float((20-10) / (100-10))
    0.0

If either side of the division is cast to a float it will work:

    &gt;&gt;&gt; (20-10) / float((100-10))
    0.1111111111111111

Each side in the first example is evaluating as an int which means the final answer will be cast to an int. Since 0.111 is less than .5, it rounds to 0.  It is not transparent in my opinion, but I guess that&#39;s the way it is.

What is the explanation?


Why does the division get rounded to an integer?

I know there is a minute possibility of a clash but if I generated a batch of 1000 GUIDs (for example), would it be safe to assume they&#39;re all unique to save testing each one?

**Bonus question**

An optimal way to test a GUID for uniqueness? Bloom filter maybe? 

Is it safe to assume a GUID will always be unique?

When I use the itemize environment, i.e.

    \begin{itemize} 
        \item one
        \item two
        \item three
    \end{itemize}

The bullet points are ugly bitmap graphics that have harsh (aliased) edges. I&#39;d like it to be a nice, clean font character or vector graphic

How do you change the image of a bullet point in LaTeX Beamer

I want to put a left arrow over letter in math mode. I am looking for exactly the reverse of the vector symbol in `\vec{x}`. I tried to put it with `\stackrel{\leftarrow}{x}`, but it doesn&#39;t look good.

Thanks.

LaTex left arrow over letter in math mode

My equation is very long. How do I get it to continue on the next line rather than go off the page?

How can I have linebreaks in my long LaTeX equations?

When I do `\footnote{}` for a value in a table, the footnote doesn&#39;t show up. How do I get it to show up? Also, is it possible to get it to show up at the bottom of the table rather than the bottom of the page?

Footnotes for tables in LaTeX

How do you write a URL in Latex? 

The subscripts and everything else make the font look very strange when it compiles.

How to write URLs in Latex?

I&#39;m trying to add some code in a presentation made with LaTex. I used beamer, added some frames without problems but once I add the listing, I can&#39;t compile the presentation anymore.

&lt;!-- language-all: lang-latex --&gt;

    \begin{frame}{Code}
    \begin{lstlisting}
    Sample Code
    \end{lstlisting}
    \end{frame}

The error I pdflatex gave me is:

    Package Listings Warning: Text dropped after begin of listing on input line 80.

Is there anything special to add to make it work ?

LaTex, issue with Beamer and Listings

Does anybody know a provider offering TV listings (through API or download) for all channel and cable providers?

Or is there any independent company collecting/providing such data?
An API/REST/SOAP interface would be great.

TV guide listing API

Is there a command in PostgreSQL to select active connections to a given database?

`psql` states that I can&#39;t drop one of my databases because there are **active connections to it**, so I would like to see what the connections are (and from which machines)

Content Type	Original Author	Original Content on Stackoverflow
Question	Michal	View Question on Stackoverflow
Solution 1 - Math	mropa	View Answer on Stackoverflow

Math symbols in listings

Math Problem Overview

Math Solutions

Solution 1 - Math

How can I pull an existing heroku app to new location for development?

How does Java order items in a HashMap or a HashTable?

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