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how to find T(i+1) when we have series of data .

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Engineer Batoor khan mummand 2020-10-10

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编辑： Engineer Batoor khan mummand 2020-10-14

采纳的回答： KSSV

solar_intensity.xlsx

Hi all;

how to find T(i+1) for each day of s values.

i can import data but i have problem in loop i mean to find values of T(i+1) for each values of S?

thanks in advance from all of u,

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KSSV 2020-10-10

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From your formula you can write the following for T(i+1)

T(i+1) = k*S*(Tb-T(i))+T(i) ;

Define your k, S, Tb and intialize your T with intiial value and run a loop.

k = rand ;   % give your value 
S = rand ;  % give your value 
n = 100 ; 
T = zeros(n,1) ; 
T(1) = 3. ;     % initial value of T
for i = 2:n
    T(i) = k*S*(Tb-T(i-1))+T(i-1) ; 
end

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thanks from your eply.

s is already define which is an excel file but i want to find T(i+1) for each hour and each day of S.

THANKS

KSSV 2020-10-10

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That is what given in the code.

Engineer Batoor khan mummand 2020-10-13

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Hi to all;

thank you so much KSSV from u r reply.

this is my code:

myData = readtable('solar_intensity.xlsx', 'Sheet', 'data1');
s = myData.solar_radiation; 
k=1120;
Tb=100;
T(i+1) = k*s*(Tb-T(i))+T(i) ; 
k = 1220;   % give your value 
  % give your value 
n = 100 ; 
T = zeros(n,1) ; 
T(1) = 20 ;     % initial value of T
for i = 2:n
    T(i) = k*s*(Tb-T(i-1))+T(i-1) ; 
end

it gives me this error ;

Index exceeds matrix dimensions.

Error in sym/subsref (line 841)

R_tilde = builtin('subsref',L_tilde,Idx);

Error in Required_data (line 10)

T(i+1) = k*s*(Tb-T(i))+T(i) ;

KSSV 2020-10-13

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编辑：KSSV 2020-10-14

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myData = readtable('solar_intensity.xlsx', 'Sheet', 'data1');
s = myData.solar_radiation; 
m = length(s) ; n = 100 ; 
k=1120;
Tb=100;
k = 1220;  
T = zeros(n,1) ; 
for i = 1:m
  si = s(i)  ;  % pick one value as of now 
  T(i,1) = 20 ;     % initial value of T
    for j = 2:n
      T(i,j) = k*si*(Tb-T(i-1))+T(i-1) ; 
    end
end
  

Engineer Batoor khan mummand 2020-10-14

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hi KSSV ;

how are you, it works for only one value of s dear,i want to T(i+1) for S(i) where i=0 such that To=20 for the begining of first day to the end of first day than it will again work same for second day of S(i)values.

S(i)=solar _radiation.

T(i+1)=outlet temperature.

T(i)=inlet temperature.

thanks

KSSV 2020-10-14

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Edited tha answer.

Engineer Batoor khan mummand 2020-10-14

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what do you mean by (edited the answer).

KSSV 2020-10-14

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编辑：KSSV 2020-10-14

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It means....I have changed the answer..included the s in loop....check the previous comments/ answer.

myData = readtable('solar_intensity.xlsx', 'Sheet', 'data1');
s = myData.solar_radiation; 
m = length(s) ; n = 100 ; 
k=1120;
Tb=100;
k = 1220;  
T = zeros(n,1) ; 
for i = 1:m
  si = s(i)  ;  % pick one value as of now 
  T(i,1) = 20 ;     % initial value of T
    for j = 2:n
      T(i,j) = k*si*(Tb-T(j-1))+T(j-1) ; 
    end
end
  