Undefined varialble ? where?

Question

Andrew Alkiviades 2011-6-9

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https://ww2.mathworks.cn/matlabcentral/answers/9152-undefined-varialble-where

[EDIT: 20110609 13:08 CDT - reformat - WDR]

hey guys i am trying to find a sum of cashflows based on 4 different scenarios. This is my code and I can only run the program and get a solution from net_income_1. The other 3 net_incomes are returned as undefined. Any ideas?

xin(1) = 500;
xin(2) = 427;
FIT = 12.1;
Xe = 3.1;
RHI = 3;
Pth = 3;
fuel = xin(1)*2.13;
maintenance = xin(1)*0.5;
Pe = 6.5;
Le = xlsread('hourly electric demand.xlsx');
Lth = xlsread('hourly thermal demand.xlsx');
for j=1:1
      for i=1:24
          if xin(1)>= Le(j,i) &&  xin(2)>=Lth(j,i);
              Feed_in_tariff_1 = Le(j,i)*FIT;
              exported_electricity_1 = (Le(j,i)-xin(1))*Xe;
              Heat_incentive_1 = Lth(j,i)*RHI;
              avoided_electric_1 = Le(j,i)*Pe;
              avoided_thermal_1 = Lth(j,i)*Pth;
              income_1 = Feed_in_tariff_1+exported_electricity_1+...
                  avoided_electric_1+avoided_thermal_1+Heat_incentive_1;
              expences_1 = fuel+maintenance;
              net_income_1 = income_1-expences_1;
          elseif xin(1)<=Le(j,i) &&  xin(2)<=Lth(j,i);
              Feed_in_tariff_2 = xin(1)*FIT;
              Heat_incentive_2 = (Lth(j,i)-xin(2))*RHI;
              avoided_electric_2 = xin(1)*Pe;
              avoided_thermal_2 = xin(2)*Pth;
              electric_purchase_2 = (Le(j,i)-xin(1))*Pe;
              thermal_purchase_2 = (Lth(j,i)-xin(2))*Pth;
              income_2 = Feed_in_tariff_2+ Heat_incentive_2 + avoided_electric_2 + avoided_thermal_2;
              expences_2 = fuel+maintenance+electric_purchase_2+thermal_purchase_2;
              net_income_2 = income_2-expences_2;
          elseif xin(1)>=Le(j,i) &&  xin(2)<=Lth(j,i);
              Feed_in_tariff_3 = Le(j,i)*FIT;
              Heat_incentive_3 = (Lth(j,i)-xin(2))*RHI;
              exported_electric_3 = (Le(j,i)-xin(1))*Xe;
              avoided_electric_3 = xin(1)*Pe;
              avoided_thermal_3 = xin(2)*Pth;
              thermal_purchase_3 = (Le(j,i)-xin(2))*Pth;
              income_3=Feed_in_tariff_3 + exported_electric_3 +...
                  Heat_incentive_3 + avoided_electric_3 + avoided_thermal_3;
              expences_3 = fuel+maintenance+thermal_purchase_3;
              net_income_3 = income_3 - expences_3;
          else
              if xin(1)<= Le(j,i) &&  xin(2)>= Lth(j,i);
                  Feed_in_tariff_4 = xin(1)*FIT;
                  Heat_incentive_4 = Lth(j,i)*RHI;
                  exported_electric_4 = 0;
                  avoided_electric_4 = Le(j,i)*Pe;
                  avoided_thermal_4 = xin(2)*Pth;
                  electric_purchase_4 = (Le(j,i)-xin(1))*Pe;
                  income_4 = Feed_in_tariff_4 + exported_electric_4 +thermal_purchase_4...
                      + Heat_incentive_4  + avoided_electric_4  + avoided_thermal_4 ;
                  expences_4 = fuel+maintenance+electric_purchase_4;
                  net_income_4 = income_4 - expences_4;
              end
          end
      end
  end
final = net_income_1 + net_income_2

Thanks

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Sean de Wolski 2011-6-9

Do you define them if the if statement fails?

Andrew Alkiviades 2011-6-9

The 4 combinations are the only possible ones so I have tried to cover them with the if, elseif etc statements

so the if statement cant fail

thanks

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Answer 1

Sean de Wolski 2011-6-9

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/9152-undefined-varialble-where#answer_12610

I'm not positive, but I'm pretty sure there's a way through your decision tree that doesn't define them. The last outer else forces you into an inner if with no else so when it fails that inner if they're left undefined.