# How can I replace data on the axis to become u horizontal and y vertical?

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Shreen El-Sapa on 18 Mar 2024
Answered: Hassaan on 18 Mar 2024
y = 0:0.01:5;
t1=0.1; t2=3;t3=5;t4=10;
nu = 5;
u0=1;
figure(1)
hold on
u1 = u0.*erfc(y./2.*sqrt(nu*t1));
u2 = u0.*erfc(y./2.*sqrt(nu*t2));
u3 = u0.*erfc(y./2.*sqrt(nu*t3));
u4 = u0.*erfc(y./2.*sqrt(nu*t4));
plot(y,u1,'-',y,u2,'--',y,u3,'-.',y,u4,':','LineWidth',2)
grid on
xlabel('y');
ylabel('u(y,t)');
legend('t = 0.1','t = 3','t = 5','t = 10','Location','best')
%title('Velocity distributions at different t')
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### Answers (2)

Dyuman Joshi on 18 Mar 2024
Use -
plot(u1,y,'-',u2,y,'--',u3,y,'-.',u4,y,':','LineWidth',2)
Note the syntax for plotting x and y data using plot is -
plot(x_data, y_data)
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Hassaan on 18 Mar 2024
y = 0:0.01:5;
t1=0.1; t2=3; t3=5; t4=10;
nu = 5;
u0=1;
figure(1)
hold on
u1 = u0.*erfc(y./2.*sqrt(nu*t1));
u2 = u0.*erfc(y./2.*sqrt(nu*t2));
u3 = u0.*erfc(y./2.*sqrt(nu*t3));
u4 = u0.*erfc(y./2.*sqrt(nu*t4));
% Switch the order of u and y in the plot function
plot(u1, y, '-', u2, y, '--', u3, y, '-.', u4, y, ':', 'LineWidth', 2)
grid on
% Update labels accordingly
xlabel('u(y,t)');
ylabel('y');
legend('t = 0.1', 't = 3', 't = 5', 't = 10', 'Location', 'best')
title('Velocity distributions at different t')
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