如何在matlab上编码传奇？

Question

我的情节在传说中有问题，传说应该是：-------- 2sin（0.5x）和+ cos（2x）。但我无法做到。 请欣赏我的stackoverflow和matlab。

这是我的代码：

% Create the x-axis
x = 0:pi/30:2*pi;

% Make a vector for 2sin(x/2)
y1 = 2*sin(x/2) ;

% Plot 2sin(x/2) as a solid line in red
plot(y1,'color','r')

% Make a vector for cos(2x)
y2 = cos(2*x);

% Use hold on to add a second plot to the graph
hold on

% Plot cos(2x)
plot(y1,'-r')
plot(y2,'+k')

% Activate a grid
grid on

% Create a legend
legend({'2sin(0.5x)','cos(2x)'})

% Add x and y labels
xlabel('x')
ylabel('2sin(0.5x) , cos(2x)')

% Add a title
title('This is my second MSUM plot')

Answer 1

% Create the x-axis
x = 0:pi/30:2*pi;

% Make a vector for 2sin(x/2)
y1 = 2*sin(x/2) ;

% Plot 2sin(x/2) as a solid line in red

% Make a vector for cos(2x)
y2 = cos(2*x);

% Use hold on to add a second plot to the graph
hold on

% Plot cos(2x)
plot(y1,'-r')
plot(y2,'+k')

% Activate a grid
grid on

% Create a legend
legend({'2sin(0.5x)','cos(2x)'})

% Add x and y labels
xlabel('x')
ylabel('2sin(0.5x) , cos(2x)')

% Add a title
title('This is my second MSUM plot')