MATLAB® is the high-level language and interactive environment used by millions of engineers and scientists worldwide.
It lets you explore and visualize ideas and collaborate across disciplines including signal and image processing, communications, control systems, and computational finance.
MATLAB examples : http://in.mathworks.com/products/matlab/examples.html
Matlab has a good experience and can perform all visualisation tasks quite well,but its not free .We have to purchase license.Hence i have listed some alternatives that you can look upon.
But it depends on task that you are going to accomplish.
1. What is Scilab ?
Scilab is free and open source software for numerical computation providing a powerful computing environment for engineering and scientific applications.
A high-level interpreted language, primarily intended for numerical computations. It provides capabilities for the numerical solution of linear and nonlinear problems, and for performing other numerical experiments. It also provides extensive graphics capabilities for data visualization and manipulation.
A free open-source mathematics software system licensed under the GPL. It builds on top of many existing open-source packages: NumPy, SciPy, matplotlib, Sympy, Maxima, GAP, FLINT, R and many more. Access their combined power through a common, Python-based language or directly via interfaces or wrappers.
4.OPENMODELICA is an open-source Modelica-based modeling and simulation environment intended for industrial and academic usage.
Innovative, powerful and flexible software for understanding systems, solving problems, and designing products. What makes it special is its unparalleled graphical interactivity.
Provides a proven scientific and analytic Python package distribution plus key integrated tools for iterative data analysis, data visualization and application development.
free (GPL/LGPL) ``data-flow oriented_ development environment. It can be used to build complex applications by combining small, reusable building blocks. In some way, it has similarities with Simulink and LabView, although it is not designed (and far) to be a "clone" of any of them.