Hi Everyone!

I am trying to optimize the energy consumption of a system while taking into account the heat that is added to the room. For this i need to take into account the radiant heat that is effected by heat produced in previous intervals.

I am trying to do a summation of a controlled index (j= time interval) to try to achieve the following equation output.

set i=1 and A,b,c,s= constants

C(j=1)= (A*b*c)*x(j=1,i=1)+(A*b*(1-c)*s1) x(j=1,i=1)*c)

C(j=2)=(Ab

*x(j=2,i=1)+(A*b*(1-c)

*s1)*(1-c)

*x(j=2,i=1)+((A*b*s2))*c)

*x(j=1,i=1)*

C(j=3)=(AbC(j=3)=(A

*x(j=3,i=1)+(A*b*(1-c)

*s1)*(1-c)

*x(j=3,i=1)+((A*b*s2))*(1-c)*s3))*x(j=1,i=1).

*x(j=2,i=1)+((A*b## I have tried alias-ing j with jjj however jjj only takes the current value of j and not the previous one even though i m trying to sum over

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