Scilab is not available for Android but there are a few alternatives with similar functionality. The best Android alternative is MATLAB. It's not free, so if you're looking for a free alternative, you could try jasymca or Addi. If that doesn't suit you, our users have ranked more than 25 alternatives to Scilab and four of them are available for Android so hopefully you can find a suitable replacement.
MATLAB is a numerical computing environment and programming language. Maintained by The MathWorks, MATLAB allows easy matrix manipulation, plotting of functions and data, implementation of algorithms, creation of user interfaces, and interfacing with programs in other languages.
Jasymca is an interactive System for solving math problems. It supports arbitrary precision numbers and symbolic variables. Scalars, vectors, and matrices can be built from all datatypes and used in calculations.