I have made a code for calculating the electric field intensity for n charges. I need help plotting the electric field intensity pl help !

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Vincent Abraham il 16 Mar 2020
Risposto: Andreas Bernatzky il 16 Mar 2020
%This is a program for calculating electric field for n number of charges
%where the source and field points are in cartesian coordinates.
%First, defining the proportionality constant
K=8.99*10^9;
%Taking the input for n no. of charges
n=input('Enter number of charges: ');
for i=1:n
q(i)=input('Enter the charge in coulombs: ');
end
%Taking the coordinates of the field point
disp('Enter the coordinates for the field point :');
xf=input('Enter x coordinate of the field point : ' );
yf=input('Enter y coordinate of the field point: ');
zf=input('Enter z coordinate of the field point: ');
%Taking the coordinates of n source points for n charges
disp('Enter the coordinates for the source point for the four charges :');
for m=1:n
x(m)=input('Enter x coordinate : ' );
y(m)=input('Enter y coordinate : ');
z(m)=input('Enter z coordinate : ');
%field point - source point for getting vector r
xi(m)=xf-x(m);
yi(m)=yf-y(m);
zi(m)=zf-z(m);
end
%Performing the summation portion of the formula
sum=0;
for m=1:n
mag(m)=(sqrt(xi(m)^2 + yi(m)^2 + zi(m)^2))^3;
sum=sum+q(m)*([xi(m),yi(m),zi(m)]/mag(m));
end
%Finally multiplying it by K
disp('The electric field intensity is :');
ef=K*sum;
ef
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darova il 16 Mar 2020
It's very annoying
Enter number of charges: 5
Enter the charge in coulombs: 10
Enter the charge in coulombs: 85
Enter the charge in coulombs: 5
Enter the charge in coulombs: 10
Enter the charge in coulombs: 10
Enter the coordinates for the field point :
Enter x coordinate of the field point : 100
Enter y coordinate of the field point: 80
Enter z coordinate of the field point: 5
Please attach all necessary data or change the code
• I need help plotting the electric field intensity pl help !
What kind of help do you need?

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Andreas Bernatzky il 16 Mar 2020
As darova already mentioned it is really annoying. You should think about a different user input.
But for visualizing I would suggest something like surf(), mesh().
Create a 2D matrix with the size of your [min,max] values for the cartesian xy-coordinates. Calculate the field intensity in each point. Than just use surf() or mesh() on your matrix. For every z-Coordinate i would create an extra 2D Matrix.
yourElectricField = rand(5,5); % create a random 2D matrix with the size of 5 in x and 5 in y
surf(yourElectricField); %simple visualization
Thats just my personal opinion of your problem because I do not know your application and neither I am a expert for electric fields but I think I get the problem.
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