Hi Oday,
I understand that you are finding difficulty in keeping each value of the variables generated in the loop saved. Additionally, the plot generated by your code is blank and does not show the plots.
Data created in a loop can be extracted by saving it to an array. The entire data can then be plotted from the array itself, rather than plotting it point wise in the loop. The ‘hold on’ command may be used once before adding all the plots. Then the ‘hold off’ command should be used.
The below code may help.
clc
clear
close all
format long
mu0=4*pi*10^-7;
R=0.9;
N=17;
I=12.5;
z2 = -1.5:0.01:1.5;
elm = length(z2);
B1arr = zeros(1, elm); % creating array to add B1 to in the loop
B2arr = zeros(1, elm); % creating array to add B2 to in the loop
Btarr = zeros(1, elm); % creating array to add Bt to in the loop
i=1;
for z=-1.5:0.01:1.5
B1=((mu0*N*I*R^2)/2)*(1/(R^2+(z+(R/2))^2)^(3/2));
B2=((mu0*N*I*R^2)/2)*(1/(R^2+(z-(R/2))^2)^(3/2));
Bt=B1+B2;
B1arr(1,i ) = B1; % adding B1 to array
B2arr(1,i ) = B2; % adding B2 to array
Btarr(1,i ) = Bt; % adding Bt to array
i=i+1;
end
hold on
plot(z2, B1arr, 'b')
plot(z2, B2arr, 'r')
plot(z2, Btarr, 'g')
hold off
Regards,
Shubhankar
