How to plot graph?

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Nur Nadhirah Syed Malik
Nur Nadhirah Syed Malik on 30 Dec 2021
Answered: Prachi Kulkarni on 11 Jan 2022
Hi, I really need help. I want to plot graph where the x-axis is the radius (r) and the y-axis is the velocity (u). I want the x-axis the range is from 0 to 1. Can anyone help me, pleaseee
%Parameters to define the governing casson fluid equation and the
%parameters value range
L= 1; % Length of the artery
maxk= 10; % Number of time steps
tmax = 0.1; % Maximum time
delta_t = tmax/maxk; % Time step
n = 10; % Number of space steps
delta_r = L/n; % Radial direction
Beta1 = 0.025; % Casson fluid parameter
A0 = 0.2; % Amplitude of systolic pressure gradient
A1 = 0.4; % Amplitude of diastolic pressure gradient
omega = pi/4;
r= 1;
%Initial conditions of velocity
for i = 1:n+1
u(i,1) = 0;
% Boundary conditions
for j=1:maxk+1
u(1,j) = 0;
u(n,j) = 0;
% Implementation of the explicit
for j=1:maxk % Time Loop
for i=2:n % Space Loop
S10 = (u(2,j)-2*u(1,j)+u(2,j))/((delta_r)^2);
S20 = (u(2,j)-u(1,j))/(delta_r);
u(1,j+1) = u(1,j) + delta_t*(A0 + A1*cos(omega*t) + Beta1*((S10) + (1/r)* (S20)));
S1 = (u(i+1,j)-2*u(i,j)+u(i-1,j))/((delta_r)^2);
S2 = (u(i+1,j)-u(i,j))/(delta_r);
u(i,j+1) = u(i,j) + delta_t*(A0 + A1*cos(omega*t) + Beta1*((S1) + (1/r)* (S2)));
S1n = (u(n+1,j)-2*u(n,j)+u(n-1,j))/((delta_r)^2);
S2n = (u(n+1,j)-u(n,j))/(delta_r);
u(n,j+1) = u(n,j) + delta_t*(A0 + A1*cos(omega*t) + Beta1*((S1n) + (1/r)* (S2n)));
%Graphical representation of the velocity at different selected times
Walter Roberson
Walter Roberson on 30 Dec 2021
I suggest that you are trying to do something that cannot be done, and need to instead change what you are trying to do.
At the moment, you have an r dimension, a time dimension, a spatial dimension, and a result. That is a 3D array of data, which would require a 4 dimensional plot. Such plots are difficult to interpret, but you can try volumeViewer() or slice() or isosurface()

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Answers (1)

Prachi Kulkarni
Prachi Kulkarni on 11 Jan 2022
If you want the plots for each timepoint in separate figures, you can use the following code.
r_range = 0:delta_r:1;
for j=1:maxk+1
figure, plot(r_range,u(:,j));
If you want the plots for all timepoints in the same plot, you can use the following code.
figure, plot(r_range,u);


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