MATLAB Interview Questions And Answers

MATLAB is a high-performance language for technical computing. It integrates computation, visualization, and programming in an easy-to-use environment where problems and solutions are expressed in familiar mathematical notation. Typical uses include:

* Math and computation
* Algorithm development
* Modeling, simulation, and prototyping
* Data analysis, exploration, and visualization
* Scientific and engineering graphics
* Application development, including Graphical User Interface building

The MATLAB system consists of five main parts:

* The MATLAB language.
* The MATLAB working environment.
* Handle Graphics.
* The MATLAB mathematical function library.
* The MATLAB Application Program Interface (API).

This is a high-level matrix/array language with control flow statements, functions, data structures, input/output, and object-oriented programming features. It allows both "programming in the small" to rapidly create quick and dirty throw-away programs, and "programming in the large" to create complete large and complex application programs.

This is the set of tools and facilities that you work with as the MATLAB user or programmer. It includes facilities for managing the variables in your workspace and importing and exporting data. It also includes tools for developing, managing, debugging, and profiling M-files, MATLAB's applications.

This is the MATLAB graphics system. It includes high-level commands for two-dimensional and three-dimensional data visualization, image processing, animation, and presentation graphics. It also includes low-level commands that allow you to fully customize the appearance of graphics as well as to build complete Graphical User Interfaces on your MATLAB applications.

This is a vast collection of computational algorithms ranging from elementary functions like sum, sine, cosine, and complex arithmetic, to more sophisticated functions like matrix inverse, matrix eigenvalues, Bessel functions, and fast Fourier transforms.

This is a library that allows you to write C and Fortran programs that interact with MATLAB. It include facilities for calling routines from MATLAB (dynamic linking), calling MATLAB as a computational engine, and for reading and writing MAT-files.

The function noise.m, now installed on ashland too, adds Gaussian, uniform, salt and pepper, additive or multiplicative noise to an image.

Simple calculations 2. Plotting and analyzing mathematical relationships (2D and 3D) 3. List & Matrix Operations 4. Writing script files (a type of programming) 5. Symbolic manipulation of equations 6. Advanced visualization, animation and GUI interface tools

Thinking is terms of full matrices/vectors and also some related functions for that * Use of filter(), which works beautifully for some time series models

We will run it from sthelens, and only if sthelens is down, from cher, orsay or tiree. It works on other machines too, but some of the other machines have older versions of the OS and core dump upon exiting from matlab. Some other local machines with new setups work fine. Try your local machine. Matlab is blocked from running on the servers

Matlab already handles naturally simple LaTeX encodings that allow introducing Greek lettters or modifying the font size and appearance in plots.

Sometimes you may want to run scripts which contain plotting commands without displaying the plots and without going into the script to comment out the commands. An example: if you're working from home and it's too slow to run graphics over the network. You can play a simple UNIX trick: % setenv DISPLAY /dev/null % matlab

Open a LOCAL MACHINE window and type: xhost +ashland # Add the following code sequence just before the plot command that was giving you problems: figure; set(gcf,'renderer','zbuffer'); [s,w] = unix('echo $DISPLAY'); set(gcf,'XDisplay',w);

This can be done from the command line or from a makefile. You need a script (filename.m). Just type at the command line, or include in the makefile: matlab<filename.m where filename.m can write to disk a figure, a binary, an ascii file, anything you want.

People working on these areas as a aerospace engineers should have familiarity and exposure to NASTRAN and MATLAB with knowledge on space environment and modeling of flexible dynamics. These aerospace engineers will be responsible to conduct stress analysis on metallic and composite structures. NASTRAN, IDEAD, Oracle and PATRAN proficiency level is required. Their duties also include on aircraft which are metallic and composite structures. This includes and understanding of control surface stiffness and loop calculations, finite element modeling (FEM), fatigue testing requirement and analysis.

its used for best in human reality

Following are the 5 main parts of MATLAB.
► MATLAB Languange.
► MATLAB working environment.
► Graphics handler.
► MATLAB mathematical library.
► MATLAB Application Program Interface.

MATLAB language is a high-level matrix language.
► It has control structures, functions, data structures, I/O and OOP features.
► Allows rapid creation of throw-away programs.
► Allows creating large and complex application programs.
► MATLAB API allows to author C and FORTRAN programs to interact with MATLAB.

MATLAB working environment has various tools to work with MATLAB.
► It has facilities to manage variables.
► MATLAB supports export and import data across applications.
► Certain tools are available to develop and manage MATLAB files.
► Debugging and profiling of MATLAB applications are more flexible with MATLAB.

MATLAB mathematical functions include computational algorithms.
► The elementary computational functions are sum, sine, etc.
► Matrix functions are available including matrix inversion.
► Special functions like Bessel are available.
► MATLAB includes transformation functions, namely Fourier Transformation Functions.

MATLAB is used in aerospace engineering, space environment.
► MATLAB is suitable for flexible dynamics.
► These domain experts conduct stress analysis on various structures like metallic and composite structures.
► To analyze the stress, NASTRAN, IDEAD, Oracle and PATRAN levels of proficiency is needed.
► The tasks are also used on aircraft that is metallic structure.
► The stress analysis includes control surface stiffness understanding, loop calculations, finite element modeling and fatigue testing requirement and analysis.

Handle Graphics is a subsystem of MATLAB that handles graphics.
► Handle Graphics has high level commands for 2D and 3D data visualization.
► Image processing, animation and presentation graphics can be generated using Handle Graphics.
► Low level commands allow customizing the graphics appearances.
► Handle Graphics allows to build customized Graphics User Interfaces

3D visualization elements allow MATLAB to deal with 3D graphics.
► Surface and Mesh Plots - It includes plot matrices, visualize functions, color maps.
► View Control - Used to control camera viewpoint, rotation, zooming, and aspect ratio and set axis limits.
► Lighting - Used for adding and controlling scene lighting.
► Transparency - Used to specify object transparency.
► Volume Visualization - Used for volume data grid.