How do you plot a graph with various initial data?

Question

Alex 2014-2-23

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/118309-how-do-you-plot-a-graph-with-various-initial-data

评论： Mischa Kim 2014-2-23

The code below is work prefect, but how do I plot another initial data into one graph, such as I want to plot something when A = 3 etc but both initial data are in the same plot.

A=3.3
B=0.45
V=182.5
a=B; %%%formula for a
b=(A+sqrt(A.^2 - 4*(B.^2)))/(A-sqrt(A.^2 - 4*(B.^2))); %%%formula for b
c= -2*B; %%%formula for c
d=-2*A/(A-sqrt(A.^2 - 4*(B.^2))); %%%formula for d 
K=(0:0.01:1);
alpha=(a+d-K.^2).^2 - (K.^2)*(V.^2)-4*(a*d - b*c - d*(K.^2))
beta=2.*K.*V.*(K.^2 - a + d)
re=1/2 *(a+d-K.^2+ sqrt((1/2 *((sqrt((alpha).^2 + (beta).^2))+ alpha))))
%A plot Re as a function of k
figure;
plot(K,re,'r');
title('Re as a function of k', 'fontsize', 10);
xlabel('K');
ylabel('Re');
grid on

I want my plot like this with 3 different initial data.

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Answer 1

Mischa Kim 2014-2-23

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/118309-how-do-you-plot-a-graph-with-various-initial-data#answer_125706

编辑：Mischa Kim 2014-2-23

在 MATLAB Online 中打开

Something like this:

A_vec = [3.0; 3.3; 3.6];      % define your different A vals
figure 
hold all                      % plot all in the same figure
for ii = 1:length(A_vec)      % loop through all A vals
    A = A_vec(ii);            % assign iith val to A 
    B=0.45
    V=182.5
    a=B; %%%formula for a
    b=(A+sqrt(A.^2 - 4*(B.^2)))/(A-sqrt(A.^2 - 4*(B.^2))); %%%formula for b
    c= -2*B; %%%formula for c
    d=-2*A/(A-sqrt(A.^2 - 4*(B.^2))); %%%formula for d
    K=(0:0.01:1);
    alpha=(a+d-K.^2).^2 - (K.^2)*(V.^2)-4*(a*d - b*c - d*(K.^2))
    beta=2.*K.*V.*(K.^2 - a + d)
    re=1/2 *(a+d-K.^2+ sqrt((1/2 *((sqrt((alpha).^2 + (beta).^2))+ alpha))))
    %A plot Re as a function of k
    plot(K,re);
end
title('Re as a function of k', 'fontsize', 10);
xlabel('K');
ylabel('Re');
grid on