無法輸出所要繪製的圖形

繪出x = y=2t^2-3tcos2\pi60t+2的圖形

这是程序代码

xlabel('x = y=2t^2-3tcos2\pi60t+2');

title('homework of the Function','FontSize',12)

axis([0 50 0 50])

x = 0:100;

y=2*x*x-3*cos*pi60t+2

plot(y,'c:h')

%axis([0 50 0 50])

axis equal

运行后無法出現圖形

Error using *

Incorrect dimensions for matrix multiplication. Check that the number of columns in

the first matrix matches the number of rows in the second matrix. To operate on each

element of the matrix individually, use TIMES (.*) for elementwise multiplication.

Answer 1

[V Sairam Reddy]

Hi Snow,

After investigating the shared code snippet, these are some following issues being identified:

• ' x*x ' is considered as matrix multiplication and as dimensions doesn't match there is an error.
• Cosine of a number is programmed as ' cos(number) '.
• The range of Y-axis is [0, 2e4] and X-axis is [0, 100]. Using 'axis equal' command will not plot the graph appropriately.

Please follow the below code to make it work:

xlabel('x = y=2t^2-3tcos2\pi60t+2');
title('homework of the Function','FontSize',12)
axis([0 50 0 50])
x = 0:100;
y=2*x.*x-3*x.*cos(2*pi*60*x)+2;
plot(y,'c:h')

%axis([0 50 0 50])
%axis equal

It is recommonded to take the free 'MATLAB Onramp' course to familiarize with programming in MATLAB.