mapping bode plot for Low Pass Filter

Can someine please tell me what I am doing wrong with my code here

R = 1000;
C = 100*10^(-9);
tau = R*C;
w = 0:100:100000;
x = ((1-((w)*tau)^2)/((w)*tau)^2)+9;

Error using ^
Incorrect dimensions for raising a matrix to a power. Check that the matrix is square and the power is a scalar. To operate on each element of the matrix individually, use POWER (.^) for elementwise power.

G = 1/(sqrt(x));
plot(w,G);
 

Answer 1

[Star Strider]

You need to do element-wise exponentiation (.^) and division (./) —

R = 1000;
C = 100*10^(-9);
tau = R*C;
w = 0:100:100000;
x = ((1-((w)*tau).^2)./((w)*tau).^2)+9;
G = 1./(sqrt(x));

plot(w,G);

See the documentation section on Array vs. Matrix Operations for details.

figure
semilogx(w,mag2db(G/max(G)))
axis('padded')

EDIT — Added second plot.

.

Answer 2

[AMIT SURYAVANSHI]

%so u r dealing with vectors their is a mistake with the x variable and this line

&x = ((1-((w)*tau)^2)/((w)*tau)^2)+9;

%the correc ted code is

R = 1000;

C = 100 * 10^(-9);

tau = R * C;

w = 0:100:100000;

x = ((1 - ((w) * tau).^2) / ((w) * tau).^2) + 9;

G = 1 ./ sqrt(x);

plot(w, G);

%the last third line is corrrected with . operator which is used in the vector element by element %multiplication just be careful while using the vector decide wheather u want to use the normal vector %multiplication or elementwise multiplication