# Array indices must be positive integers or logical values.

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Timothy Schackne on 25 Mar 2020
Commented: Timothy Schackne on 25 Mar 2020
I am trying to plot an I-V curve but I keep getting the same error
Isc = 8.7 % short circuit current
ns = 30
np = 40
n = 1.95 %Ideality factor
K0 = 0.0017
Tr = 300 % refrence temperature
Is = 1.2*10^-7 % diode reverse saturated current
q = 1.602*10^-19 % electron charge
K = 1.38*10^-23 %Boltzmann constant
Rs = 0.013
Rp = 3.5
% Part1 %
S_1 = 1000 % apparent power
T_1 = 233.15
Vpv = (0:0.01:1.2)
Ipv1 = zeros(length(T_1),length(Vpv))
Power1 = zeros(length(T_1),length(Vpv))
for k = 1:length(T_1)
Ipv1(k,:) = (np.*((Isc+K0.*(T_1(k)-Tr))./100).*S_1)-((np.*Is).*(exp(q.*Vpv)./(n.*K.*T(K).*ns))-1)-((np.*Vpv)./(ns.*Rp));
Vpv1 = Vpv.*ns;
f_1 = figure(1);
P1 = plot(Vpv1,Ipv1(k,:),'LineWidth',2.0);
grid on
hold on
title('Current vs Voltage Based on Changing Temperature');
ylabel('Current (A)');
xlable('Voltage (V)');
ylim([0,6000]);
ax = gca;
ax.FontSize = 10;
ax.FontName = 'Times New Roman';
legend('T = -40c','T = -20c','T =0c','T = 20c','T = 40c','T = 60c','Location','southwest');
end

Sindar on 25 Mar 2020
(n.*K.*T(K).*ns))
is that supposed to be T*K or T(k)?

#### 1 Comment

Timothy Schackne on 25 Mar 2020
that is supposed to be T_1(k)