How to modify PLL's to get anticlockwise movement?

[vinayakmt]

In Jessica fridrich's site(http://ws2.binghamton.edu/fridrich/Mike/permute.html) 13 PLL's are given .But i often get the last layer with 3 edges to be shifted anticlockwise.What to do in such cases?Should i learn the 21 PLL's from other websites?

[MostEd]

You can try to do the mirror or the inverse of the algorithm, wich is basically what is given on most sites for most PLL's.

[Sa967St]

Jessica Fridrich's site is one of the oldest sources for OLL and PLL algs. Many of the algs are very out-dated.

The best source for algs nowadays is the probably the speedsolving wiki. Here are the OLL page and PLL page.

To answer your original question, use the Algorithm Translator (look at "Mirror L/R" or "Mirror F/B").

[vinayakmt]

Do you mean I should learn all the 21 PLL's instead of 13?

[Endgame]

yes

[Cubenovice]

Do you mean I should learn all the 21 PLL's instead of 13?

Yes indeed.
But to break down into smaller steps you can start with so-called 2 look PLL.

Have a look here for a nice sheet with algs, make sure to check his youtube videos too.
http://badmephisto.com/pll.php

Note that some algs may have become a little outdated so take a look at the wiki page PLL that Sarah suggested.

Another tip: to reverse the direction you can just do the alg with your other hand (mirroring algs).
This way you do not have to learn new algs.
For me this works very well for A, J, G, R and U perms.

If it doesn't work for you; on the PLL page you will also find completely different algs so you can stick to right hand dominant algs if you prefer those.

[vinayakmt]

Another tip: to reverse the direction you can just do the alg with your other hand (mirroring algs).
This way you do not have to learn new algs.

Thanks that's a great tip !