Convert latex equation to png

A nice web resource to convert latex equation to .png figures is latex2png

Placing a figure here, I said right here!

 Sometimes the LaTeX engine decides not to insert the figure exactly where we want, and we want it right there. Well [h] or [h!] were the options I have tried so far, but they do not work well all the time, however if the figure is inserted with [H] option, the engine will not decide differently, even if next page or other things would ruin the layout, so I suggest to use

\begin{figure}[H]
...
\end{figure}

For more info you might check here.

How to prevent figures and tables from floating

Many times I received messages like

  LaTeX Warning: `!h' float specifier changed to `!ht'.

resulting my figures / tables appearing on the top of the page, however I wanted to place the figure _exactly_ where at that position.

TThe solution I found here is to use the package float

\usepackage{float}
...
\begin{figure}[H]
...
\end{figure}

How to use .tiff figures in MATLAB

Well, I was digging deep, and this issue does not seem to be solved :(
The best thing to do is to use png, pdf or eps instead.
When using linux the imagemagick package can be used for example as

$ convert myfile.tif myfile.pdf

How to put two figures next to each other

Use the minipage command, and the epsfig package e.g.

\begin{figure}[h]
  \hfill
  \begin{minipage}[t]{.45\textwidth}
    \begin{center}  
      \epsfig{file=figure1.eps, scale=0.5}
      \caption{figure 1}
      \label{fig-tc}
    \end{center}
  \end{minipage}
  \hfill
  \begin{minipage}[t]{.45\textwidth}
    \begin{center}  
      \epsfig{file=figure2.eps, scale=0.5}
      \caption{figure 2}
      \label{fig-tc}
    \end{center}
  \end{minipage}
  \hfill
\end{figure}

This, and other possible ways to put figures next to each other can be found here:
http://www.cse.iitd.ernet.in/~bagchi/latex-tips.html

Include figures from a separate directory

It is often a good idea to have the figures separated into a folder. This can be done using the \graphicspath command as

\graphicspath{{./mypics/}}

after the includes.
This will tell the compiler to look up the figures from the mypics directory in the document root. Don't forget to include the graphicx (or similar) package.

How to place figures / images inside a table

Figures and images can be placed within tables, but even into other environments, or without environment. A good description is available here:

http://texblog.org/2008/02/04/placing-graphicsimages-inside-a-table/

Thank you J. !