I am new to pythonista, does the app support any type of graphing similar to Matlab plot?
Take a look at http://omz-software.com/pythonista/docs/ios/index.html
The Canvas and Scene modules are the graphics modules of Pythonista.
I do not know of any graphing code that has been built on top of them.
It is quite possible there is already something out there for Pythonista, but I use this script for 1-D plotting of multiple datasets as points or lines in iPad. Easy to use, and, thanks to Canvas, seems to be quite robust.