How to plot a matrix with loop of input Variables

Question

Muhammed Ajmal Pallithadathil Nazer 2017-11-22

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https://ww2.mathworks.cn/matlabcentral/answers/368523-how-to-plot-a-matrix-with-loop-of-input-variables

编辑： Joy Mondal 2017-11-23

I want to run the below code from the value of Bx 0 to 0.0118 with an interval of .00092 and plot it in e vs Bx, where e is a 4*1 matrix. I found some problem while plotting and I am very poor in working with loops.

Bx=0:.00092:0.0115;
B=0.5*1.978*0.467*30*Bx; 
D=-7.31;
E=-1.71;
Bz=0.5*1.969*0.467*30*0;
A=[2*D+3*Bz,sqrt(3)*B,sqrt(3)*E,0;sqrt(3)*B,Bz,2*B,sqrt(3)*E;sqrt(3)*E,2*B,-Bz,sqrt(3)*B;0,sqrt(3)*E,sqrt(3)*B,2*D-3*Bz]
e=eig(A)
D=eig(A,'matrix')
plot(Bx,e)

Here I wrote the code straight away and may not be correct,

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Answer 1

Walter Roberson 2017-11-22

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https://ww2.mathworks.cn/matlabcentral/answers/368523-how-to-plot-a-matrix-with-loop-of-input-variables#answer_292502

在 MATLAB Online 中打开

syms Bx

B=0.5*1.978*0.467*30*Bx; 
D=-7.31;
E=-1.71;
Bz=0.5*1.969*0.467*30*0;
A=[2*D+3*Bz,sqrt(3)*B,sqrt(3)*E,0;sqrt(3)*B,Bz,2*B,sqrt(3)*E;sqrt(3)*E,2*B,-Bz,sqrt(3)*B;0,sqrt(3)*E,sqrt(3)*B,2*D-3*Bz]
e=eig(A)
fplot(e, [0, 0.0115])

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Muhammed Ajmal Pallithadathil Nazer 2017-11-22

Thank you, but it seems to take the Bx only the value of 0.0115 instead of the other values from 0 at a regular interval of .00092. Simply, it continuously plot the value of 0.0115 from 0 to 0.0115. Moreover, the answer from Joy Mondal works well.

Item one
Item two

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Answer 2

Joy Mondal 2017-11-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/368523-how-to-plot-a-matrix-with-loop-of-input-variables#answer_292510

Try.m

Please try this code

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Muhammed Ajmal Pallithadathil Nazer 2017-11-22

Thank you Joy. Your code is working well. It would be great if you share how to change the scale of x and y axis in the graph as well as different colour for four different values of e as it quite difficult to identify from the graph

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Answer 3

Joy Mondal 2017-11-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/368523-how-to-plot-a-matrix-with-loop-of-input-variables#answer_292511

clear all
clc
for Bx=0:.00092:0.0115
i=0;
B=0.5*1.978*0.467*30*Bx;
D=-7.31;
E=-1.71;
Bz=0.5*1.969*0.467*30*0;
A=[2*D+3*Bz,sqrt(3)*B,sqrt(3)*E,0;
sqrt(3)*B,Bz,2*B,sqrt(3)*E;
sqrt(3)*E,2*B,-Bz,sqrt(3)*B;
0,sqrt(3)*E,sqrt(3)*B,2*D-3*Bz];
e=eig(A);
j=0;
for i=1:4
j=j+1;
ei=e(i,1);
plot(Bx,ei,'ok')
hold on
end
end

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Stephen23 2017-11-22

@Joy Mondal: please format your code correctly. It is very simple: first select the code text, then click the {} Code button above the textbox.

https://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup

Joy Mondal 2017-11-23

编辑：Joy Mondal 2017-11-23

Thanks Stephen.

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Answer 4

Joy Mondal 2017-11-23

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/368523-how-to-plot-a-matrix-with-loop-of-input-variables#answer_292705

编辑：Joy Mondal 2017-11-23

在 MATLAB Online 中打开

clc 
clear all 
for Bx=0:.00092:0.0115
  i=0;
  B=0.5*1.978*0.467*30*Bx;
  D=-7.31;
  E=-1.71;
  Bz=0.5*1.969*0.467*30*0;
  A=[2*D+3*Bz,sqrt(3)*B,sqrt(3)*E,0;
      sqrt(3)*B,Bz,2*B,sqrt(3)*E;
      sqrt(3)*E,2*B,-Bz,sqrt(3)*B;
      0,sqrt(3)*E,sqrt(3)*B,2*D-3*Bz];
      e=eig(A);
      j=0;
      for i=1:4
          j=j+1;
          ei=e(i,1);
          if j==1
              plot(Bx,ei,'dk')
          elseif j==2
              plot(Bx,ei,'og')
            elseif j==3
              plot(Bx,ei,'sb')
                elseif j==4
              plot(Bx,ei,'xm')
          end
          hold on
      end
end