How to write tilde and backslash in Latex

Here is a good description about the topic:

http://tex.stackexchange.com/questions/9363/how-does-one-insert-a-backslash-or-a-tilde-into-latex

How to write Ordo for complexity in latex

Ordo (or the big-O notation) is used to describe computational complexity, in technical writing. I found the best way to write it is 

$\mathcal{O}(x^2 + ...)$

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

Multirow and multicolumn tables

Joining rows and columns  in LaTeX tables is really easy using the multirow package. For details see

http://en.wikibooks.org/wiki/LaTeX/Tables


http://www.andrewjpage.com/index.php?/archives/43-Multirow-and-multicolumn-spanning-with-latex-tables.html