# how can I plot

3 visualizzazioni (ultimi 30 giorni)
ueqweoıqwueoq il 25 Mar 2024
Modificato: Rena Berman il 3 Apr 2024
sigma_0 = 2;
r = 1:0.1:2;
ksi = 1./r;
theta = 0;
sigma_r = (1/2.*sigma_0.*(1-(ksi.^2)))-(1/2.*sigma_0.*(1+(3.*(ksi.^4))-(4.*(ksi.^2))).*cos(2.*theta))
How can I show this as theta 0, 90, 180 and 270, all in one chart, depending on sigma r?
##### 2 CommentiMostra NessunoNascondi Nessuno
Manikanta Aditya il 25 Mar 2024
Hey,
Check this:
% Constants
sigma_0 = 2;
theta_deg = [0, 90, 180, 270]; % Degrees
% Variable
r = 1:0.1:2;
% Pre-allocate sigma_r for efficiency
% Calculate sigma_r for each theta
ksi = 1./r;
sigma_r(:, i) = (1/2.*sigma_0.*(1-(ksi.^2))) - (1/2.*sigma_0.*(1+(3.*(ksi.^4))-(4.*(ksi.^2))).*cos(2.*theta));
end
% Plotting
figure; % Create a new figure
hold on; % Hold on to plot multiple lines
colors = ['r', 'g', 'b', 'k']; % Colors for each theta
plot(r, sigma_r(:, i), 'Color', colors(i), 'DisplayName', sprintf('\\theta = %d°', theta_deg(i)));
end
hold off;
xlabel('r');
ylabel('\sigma_r');
title('\sigma_r vs. r for \theta = 0, 90, 180, and 270 degrees');
legend('show');
grid on;
Rena Berman il 3 Apr 2024

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### Risposte (1)

Hassaan il 25 Mar 2024
sigma_0 = 2;
r = 1:0.1:2; % Range of r
theta_deg = [0, 90, 180, 270]; % Angles in degrees
% Preallocate matrix for sigma_r values
% Calculate sigma_r for each theta
ksi = 1./r;
sigma_r(:, i) = (1/2.*sigma_0.*(1-(ksi.^2))) - (1/2.*sigma_0.*(1+(3.*(ksi.^4))-(4.*(ksi.^2))).*cos(2.*theta));
end
% Plot sigma_r vs r for each theta
figure;
plot(r, sigma_r, 'LineWidth', 2);
xlabel('r');
ylabel('\sigma_r');
title('\sigma_r vs r for Different \theta Values');
legend('0°', '90°', '180°', '270°');
grid on;
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