A table of s versus t.

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?

Answer 1

[Les Beckham]

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

Answer 2

[Davide Masiello]

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
      s           t     
    ______    __________

        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

It seems like you might be new to Matlab, so I suggest reading some of the basic documentation. e.g.

https://ch.mathworks.com/learn/tutorials/matlab-onramp.html