How can I create a solid line from the data within a for loop?

Question

Hans Wagener 2022-12-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1876462-how-can-i-create-a-solid-line-from-the-data-within-a-for-loop

编辑： Fangjun Jiang 2022-12-12

Hi all,

I want to plot efficiency 'Eff' on the y-axis against current density 'i' on the x-axis. However, because the data is in the for loop I cannot produce a solid line. Can someone please explain how I can fix this?

clear all
close all 
clc
%I-U curve
T = 80;
r1 = 4.45153e-5;
r2 = 6.88874e-9;
r = r1 + (r2*T);
s = 0.33824;
d1 = -3.12996e-6;
d2 = 4.47137e-7;
p = 30;
t1 = -0.01539;
t2 = 2.00181/T;
t3 = 15.24178/T^2;
t = t1 + t2 + t3;
U_rev = 1.229;
A = 0.25;
f11 = 478645.74;
f12 = -2953.15;
f21 = 1.03960;
f22 = -0.00104;
for i = 0:0.2:100
U = 1.48/(U_rev + ((r1+d1)+(r2*T)+(d2*p))*(i*50) + (s * log((t*(i*50))+1)));
F = (((i*50)^2)/(f11+(f12*T)+(i*50)^2)*(f21+(f22*T)));
Eff = F*U;
plot(i,Eff,'.'); hold on 
end

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Answer 1

VBBV 2022-12-12

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https://ww2.mathworks.cn/matlabcentral/answers/1876462-how-can-i-create-a-solid-line-from-the-data-within-a-for-loop#answer_1126117

编辑：VBBV 2022-12-12

在 MATLAB Online 中打开

k =1;
for i = 0:0.2:100
U(k) = 1.48/(U_rev + ((r1+d1)+(r2*T)+(d2*p))*(i*50) + (s * log((t*(i*50))+1)));
F(k) = (((i*50)^2)/(f11+(f12*T)+(i*50)^2)*(f21+(f22*T)));
Eff(k) = F(k)*U(k);
k = k+1;
end
plot(0:0.2:100,Eff);

Use an index to store outputs into variables

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Answer 2

Fangjun Jiang 2022-12-12

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https://ww2.mathworks.cn/matlabcentral/answers/1876462-how-can-i-create-a-solid-line-from-the-data-within-a-for-loop#answer_1126122

编辑：Fangjun Jiang 2022-12-12

在 MATLAB Online 中打开

Typical way is to store the data in an array and then plot it once.

T=0:0.2:100;
Eff=zeros(size(T));
for k=1:length(T)
    i=T(k);
    U = 1.48/(U_rev + ((r1+d1)+(r2*T)+(d2*p))*(i*50) + (s * log((t*(i*50))+1)));
    F = (((i*50)^2)/(f11+(f12*T)+(i*50)^2)*(f21+(f22*T)));
    Eff(k) = F*U;
end
plot(T,Eff)

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Answer 3

Steven Lord 2022-12-12

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https://ww2.mathworks.cn/matlabcentral/answers/1876462-how-can-i-create-a-solid-line-from-the-data-within-a-for-loop#answer_1126132

在 MATLAB Online 中打开

Either use an animatedline object or create the line before the loop starts and add points to its XData and YData properties inside the loop. I'll demonstrate the former technique.

h = animatedline;

axis([0 360 -1 1])

for thepoint = 0:360

addpoints(h, thepoint, sind(thepoint))

pause(0.01)

end

I used pause here but you could also use drawnow.