A table of s versus t.

Question

jay jay 2022-12-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1876527-a-table-of-s-versus-t

编辑： Davide Masiello 2022-12-12

在 MATLAB Online 中打开

Trying to make a table of s versus t and printing the results to both the screen and to the file.

r = 9 cm, ω = 100 revolutions per second, and b = 14 cm.

0 ≤ t ≤ 0.01 s. Using 20 subdivisions on the t

domain.

r=9
omega=100
b=14
t=0:20:0.01
s(t) = r* cos(2*pi*omega*t)+ sqrt((b^2)-(r^2)*(sin(2*pi*omega*t)^2))
table(s,t)

what is wrong with this code?

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Answer 1

Les Beckham 2022-12-12

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https://ww2.mathworks.cn/matlabcentral/answers/1876527-a-table-of-s-versus-t#answer_1126252

编辑：Les Beckham 2022-12-12

在 MATLAB Online 中打开

r=9;
omega=100;
b=14;
t = linspace(0, 0.01, 20) % <<< use linspace instead to generate your t vector
t = 1×20
         0    0.0005    0.0011    0.0016    0.0021    0.0026    0.0032    0.0037    0.0042    0.0047    0.0053    0.0058    0.0063    0.0068    0.0074    0.0079    0.0084    0.0089    0.0095    0.0100
% remove the (t) on the left side and use .^2 to do element-wise operation
s = r* cos(2*pi*omega*t)+ sqrt((b^2)-(r^2)*(sin(2*pi*omega*t).^2)) 
s = 1×20
   23.0000   22.2040   19.9647   16.7222   13.1584   10.0063    7.7015    6.2396    5.4133    5.0442    5.0442    5.4133    6.2396    7.7015   10.0063   13.1584   16.7222   19.9647   22.2040   23.0000
table(s,t)
ans = 1×2 table
         s              t     
    ___________    ___________

    1×20 double    1×20 double

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Answer 2

Davide Masiello 2022-12-12

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1876527-a-table-of-s-versus-t#answer_1126257

编辑：Davide Masiello 2022-12-12

在 MATLAB Online 中打开

There are a couple of errors in your code.

First, the way you define the array t.

Second, for array operations, use the dot notation.

Third, no need to specify the s dependence on t.

r       = 9;
omega   = 100;
b       = 14;
t       = linspace(0,0.01,20)';
s       = r*cos(2*pi*omega*t)+sqrt(b^2-(r^2)*sin(2*pi*omega*t).^2);
table(s,t)
ans = 20×2 table
st________________

        23             0
    22.204    0.00052632
    19.965     0.0010526
    16.722     0.0015789
    13.158     0.0021053
    10.006     0.0026316
    7.7015     0.0031579
    6.2396     0.0036842
    5.4133     0.0042105
    5.0442     0.0047368
    5.0442     0.0052632
    5.4133     0.0057895
    6.2396     0.0063158
    7.7015     0.0068421
    10.006     0.0073684
    13.158     0.0078947