Question

Please show the code necessary, and explanations on MATLAB.

Plotting 11) Plot the function y = sin(x) from x = 0 to 21. 12) Plot the functions y = x2 z = x2 + 2x + 1 from x = 0 to 2 on the same graph. Scripts: Input and Output 13) Write a script (M-file) to read in a message at the command line using the MATLAB input function and then display the message to the Command Window using the MATLAB disp function. Now use your script and enter the message Hello world! Note that this is character data and must be dealt with as character data. Read the help file for the input function and pay particular attention to the two forms x = input (prompt) str = input (promptu's') What happens if you use the form without the 's' option. 1

Answer 1

11) Plot function y=sin(x)

% define x

x=[0:0.1:2*pi];

% compute y
y=sin(x);

% open a figure window and plot x and y

figure

plot(x,y);
xlabel('elements in vector x from 0 to 2pi');
ylabel('elements in vector y=sinx');
title ('The sine function from 0 to 2pi');
grid on,axis equal

12) Plot function y=

% define x

x=[0:0.1:2];

% compute y
y=x.^2;

% open a figure window and plot x and y

figure

plot(x,y);
hold on

%compute z

z= x.^2 + 2*x +1;

plot(x,z);

legend({'y=x.^2','z= x.^2 + 2*x +1'},'Location','southwest')

hold off

grid on, axis equal

M-script to read message from command line using input function.

x = input(prompt) displays the text in prompt and waits for the user to input a value and press the Return key.

str = input(prompt,'s') returns the entered text, without evaluating the input as an expression.

using input function without 's'

x = input(prompt) displays the text in prompt and waits for the user to input a value and press the Return key.

It will display output with a syntax error.