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Summing results at the end of a loop

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Lena
Lena 2024-5-16
评论： VBBV 2024-5-17
I have a piece of code I want to execute 3 times, changing a set of two variables to different values each time, and then add the results of the three at the end to give the final y-value and plot it.
This is the full code right now.
%Constants
L = 79.14.*(10.^-3);
N = 58;
I = 0.7;
mu = 4.*pi*(10.^-7);
% Range and steps of x-values to plot:
x = linspace(0, 90.*(10.^-3), 100);
%Variables;
w = 7.5.*(10.^-3);
u = (8.883).*(10.^-3);
%Calculation;
a = (mu.*I.*N)/(2.*L.*(u-w));
b = sqrt((u.^2)+(x.^2));
c = sqrt((u.^2)+((x-L).^2));
d = sqrt((w.^2)+(x.^2));
e = sqrt((w.^2)+((x-L).^2));
f = (b+u)./(d+w);
g = x.*log(f);
h = (c+u)./(e+w);
i = (x-L).*log(h);
j = (mu.*I.*N)/(2.*L.*(u-w));
y = j.*(g-i);
%Plotting;
figure;
plot(x, y);
xlabel('Position Along the Center Axis (m)');
ylabel('Magnetic Field (T)');
title('Magnetic Field Along the Central Axis of the Solenoid');
What I want to do is repeat the code for 3 sets of values of u and w, add the three results at the end to give the final value of y, and then plot it against x.
I thought about using for loops but I can't figure out how to sum the values at the end.
  1 个评论
VBBV
VBBV 2024-5-17
Ran in:
%Constants
L = 79.14.*(10.^-3);
N = 58;
I = 0.7;
mu = 4.*pi*(10.^-7);
% Range and steps of x-values to plot:
x = linspace(0, 90.*(10.^-3), 100);
%Variables;
w = [7.5.*(1e-3); rand(1)*7.5.*(1e-3); rand(1)*7.5.*(1e-3)];
u = [(8.883).*(1e-3);rand(1)*(8.883).*(1e-3);rand*(8.883).*(1e-3)];
x = linspace(0, 90*1e-3, 100);
for k = 1:numel(w)
%Calculation;
a = (mu.*I.*N)/(2.*L.*(u(k)-w(k)));
b = sqrt((u(k)^2)+(x.^2));
c = sqrt((u(k)^2)+((x-L).^2));
d = sqrt((w(k)^2)+(x.^2));
e = sqrt((w(k)^2)+((x-L).^2));
f = (b+u(k))./(d+w(k));
g = x.*log(f);
h = (c+u(k))./(e+w(k));
i = (x-L).*log(h);
j = (mu.*I.*N)/(2.*L.*(u(k)-w(k)));
y(k,:) = j.*(g-i);
end
y = sum(y,1)
y = 1x100
0.0010 0.0011 0.0012 0.0014 0.0015 0.0015 0.0016 0.0017 0.0017 0.0017 0.0018 0.0018 0.0018 0.0018 0.0018 0.0018 0.0019 0.0019 0.0019 0.0019 0.0019 0.0019 0.0019 0.0019 0.0019 0.0019 0.0019 0.0019 0.0019 0.0019
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<mw-icon class=""></mw-icon>
%Plotting;
figure;
plot(x, y);
xlabel('Position Along the Center Axis (m)');
ylabel('Magnetic Field (T)');
title('Magnetic Field Along the Central Axis of the Solenoid');

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回答（1 个）

Torsten
Torsten 2024-5-16
编辑：Torsten 2024-5-16
Ran in:
x = linspace(0, 90.*(10.^-3), 100);
w = [7.5.*(10.^-3),7.5.*(10.^-3),7.5.*(10.^-3)];
u = [(8.883).*(10.^-3),(8.883).*(10.^-3),(8.883).*(10.^-3)];
y = zeros(numel(w),numel(x));
for i = 1:numel(w)
y(i,:) = fun(x,w(i),u(i));
end
sum_y = sum(y,1);
%Plotting;
figure;
plot(x, sum_y);
xlabel('Position Along the Center Axis (m)');
ylabel('Magnetic Field (T)');
title('Magnetic Field Along the Central Axis of the Solenoid');
function y = fun(x,w,u)
%Constants
L = 79.14.*(10.^-3);
N = 58;
I = 0.7;
mu = 4.*pi*(10.^-7);
% Range and steps of x-values to plot:
%x = linspace(0, 90.*(10.^-3), 100);
%Variables;
%w = 7.5.*(10.^-3);
%u = (8.883).*(10.^-3);
%Calculation;
a = (mu.*I.*N)/(2.*L.*(u-w));
b = sqrt((u.^2)+(x.^2));
c = sqrt((u.^2)+((x-L).^2));
d = sqrt((w.^2)+(x.^2));
e = sqrt((w.^2)+((x-L).^2));
f = (b+u)./(d+w);
g = x.*log(f);
h = (c+u)./(e+w);
i = (x-L).*log(h);
j = (mu.*I.*N)/(2.*L.*(u-w));
y = j.*(g-i);
end

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