Question

This uses MATLAB code with plotting

HW19: Plotting with plot () Due 11:59 pm Monday 1. (10 pts) Write a script that will produce a sine curve and a cosine curve in the same plot, 0 as shown to the right. 06 0.4 0.2 To have two sets of data in one plot, you may plot the first one, then with the command hold on", plot the other. Or, you can learn how to plot two lines with just one plot () command. 02 The help document for the legend0 function will teach you how to set the location of legend box. -04 0.8 To modify x-axis, use: set (gca, 'XTick', 0:pi/2:2*pi) set (gca, 'XTickLabel',,'pi/2','pi', 3pi/2', '2pi') 2. (20+10 pts) Write a programmer-defined function that will plot a circle with user-provided center and radius. The function definition should be in this format: function draw_circle lastname (x0, yo, R) where (x0, y0) is the coordinate of the center of the circle, and R is the radius of the circle. Note that the function does not return any variable 12 10 Also write a main program that prompts the user for x0, y0, and R, validate them, and call 6 the function to create the circle plot. Origin (5, 3) * Radus 10 For example, a function call of draw circle (5, 3, 10) will create this plot: -2 A few tips: As shown in the class example, you may set the angles spaced evenly, and let x and y be functions of this angle. - 10 15 - Use the function sprintf ) to create a customized string, and then call the text ) function to add that string to the proper place in the plot. Use "axis equal" to make x-axis and y-axis the same scale.

Answer 1

1)

x = [0:0.05:2*pi];
y1 = sin(x);
y2 = cos(x);
plot(x,y1,'b-o');
hold on;
plot(x,y2,'r-o');
legend('sin(x)','cos(x)','Location','southwest');
set(gca,'XTick',0:pi/2:2*pi);
set(gca,'XTickLabel',{'0','pi/2','pi', '3pi/2','2pi'});

2)

function draw_circle_lastname( x0,y0,R )

th = 0:pi/50:2*pi;
X = R * cos(th) + x0;
Y = R * sin(th) + y0;
H = plot(X, Y);
hold on;
scatter(x0,y0,'r.'); % plot center
str = sprintf('Origin(%d,%d)\n Radius %d',x0,y0,R);
  
text(x0,y0,str);
axis equal;
hold off;
end

plotcircle.m

fprintf('Enter center of circle\n');
x0 = input('x0: ');
y0 = input('y0: ');
R = input('Enter Radius of Circle: ');
draw_circle_lastname(x0,y0,R);