Question

3. (40 Pts.) Write a script which takes the frequency, amplitude and type (sinusoidal, square or triangular) of a function as input from user and plots the function y(t) at output. Hint: In MATLAB, you can generate a sinusoidal function by using "sin", a square function by using "square" and a triangular function by using "sawtooth" functions. User-inputs Select any frequency within the interval FE lkHz, 100 kHz , select the amplitude of the signal "VM" and define the time vector "t" in the interval tE 0 0F with an increment of 0.001/F and type of the signal such as 'sin', 'square' and 'triangular'. (5 pts.) Draw a flowchart and explain your problem solving strategy. (12 Pts.) Take values of frequency, amplitude, and type from the user. (4 Pts.) Define vector t. (10 Pts.) Use a switch-case condition for different types of desired output function (different cases.) Within each case, calculate the output vector y. You may use either a loop or vector operation in this stage. a. b. c. d. e. (9 Pts.) Plot your output vector y versus time vector t. Put labels, title and legend to your figure.

Answer 1

f=input('Enter frequency: ');
a=input('Enter amplitude: ');
type= input('Enter type: ','s');
F=f*1000;
t=0:.0001/F:10/F;
switch type
    case 'sin'
        y=a*sin(2*pi*F*t);
        plot(t,y)
        xlabel('t')
        ylabel('y')
        title(['y = (',num2str(a),')sin(2*pi*',num2str(F),')'])
        legend('sin wave')
    case 'triangle'
        y=a*sawtooth(2*pi*F*t);
        plot(t,y)
        xlabel('t')
        ylabel('y')
        title(['y = (',num2str(a),')sawtooth(2*pi*',num2str(F),')'])
        legend('triangle wave')
    case 'square'
        y=a*square(2*pi*F*t);
        plot(t,y)
        xlabel('t')
        ylabel('y')
        title(['y = (',num2str(a),')square(2*pi*',num2str(F),')'])
        legend('square wave')
end