Sinusoidal plot at constant value
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Bruno Rodriguez
on 27 Feb 2017
Commented: Bruno Rodriguez
on 27 Feb 2017
Hi all,
I am trying to plot a sinusoidal line across all points where the function "phi" equals 5450, but I am unsure how to go about this. My first thought was to calculate phi for all values of x and y using a for loop, and then use the find function to determine the index of those points where phi=5450. Is there a way to make matlab plot the points at which the function is equal to a set value?
phi0=5.5*10^4;
U=20; %m/s
y=(-1000*10^3):1000:(1000*10^3);
x=(-2000*10^3):1000:(2000*10^3);
Lx=4*10^6;
Ly=4*10^6;
k=(2*pi)./Lx;
l=(2*pi)./Ly;
A=8*10^6;
f=10^-4;
for i = 1:length(y)
for j = 1:length(x)
phi(i,j) = phi0 - (f*U*y(i)) + (f*A*sin(k*x(j))*cos(l*y(i)));
end
end
id5450 = find(phi==5450);
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Accepted Answer
Walter Roberson
on 27 Feb 2017
contour(x, y, phi, [54500 54500])
Note my modification of the target value. Your phi values range from 53000 to 57000.
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