Scilab is a free and open source software for engineers & scientists. Numerical analysis or Scientific computing is the study of approximation techniques for numerically solving mathematical problems.
How to install Scilab under Windows
Follow step by step the installation process of Scilab under Windows.
Step 1. Download Scilab
Go to Scilab website, under the Download section and choose your installation package. For windows operating systems the are two versions : 32 and 64-bit. Download the one matching your operating system. The link is given below (I uses scilab 6.0.2)