Introduction to MATLAB/SciLab/Web Design (IT-406) - Important Questions

Explain the MATLAB environment and write a sample script that demonstrates variable assignment, basic arithmetic operations, workspace management (using clear and who), and how to access help for built-in functions.

Demonstrate array indexing and common matrix operations in MATLAB/Scilab (transpose, inverse, determinant) with short examples.

Write MATLAB programs to do the following:

• Use a for-loop to compute the factorial of a positive integer $n$.

• Use a while-loop to compute the sum of integers from 1 to $n$.

• Demonstrate use of $break$ and $continue$ within loops with short examples.

Write a MATLAB/Scilab function that reads a numeric data file, computes mean and standard deviation by column, and plots the results with appropriate labels.

Demonstrate how to create 2-D plots in MATLAB: plot multiple curves on the same axes, use subplot to place multiple plots in one figure, add title, legend, xlabel and ylabel, and show how to save the figure to a file.

Explain the difference between scripts and functions in MATLAB. Write a MATLAB function that accepts a numeric vector as input and returns the vector normalized to unit length.

Write a MATLAB script that reads a numeric matrix from a text file, replaces any NaN entries with the mean of their respective columns, and writes the cleaned matrix to a new text file. Provide the MATLAB code and brief explanation of each step.

What is Simulink? Describe the basic Simulink interface and outline steps to create a simple model to simulate a first-order system. Demonstrate how to obtain and plot the step response from the model.