Pick a value from a matrix to produce another value in a matrix, and loop it

Question

Emily Turnbull 2020-3-21

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https://ww2.mathworks.cn/matlabcentral/answers/512121-pick-a-value-from-a-matrix-to-produce-another-value-in-a-matrix-and-loop-it

回答： Samatha Aleti 2020-3-24

Im trying to fill a matrix with values using previous values within the matrix, however i cant make it loop so that it fills up a row, so far i have

h21=H(2,1)

h11=H(1,1)

h12=2*a*h21+(1-2*a)*h11+(a-B/(2*rw))*((dr*Q)/(pi*rw*T)

H(1,2)=h12

but i want to make it more general so it picks sequential j values from a row in a matrix and enters it in the j value after it (i.e. j+1), i was thinking it would look something like this but it isnt working:

h2j=H(2,j)

h1j=H(1,j)

h1jplus1=2*a*h2j+(1-2*a)*h1j+(a-B/(2*rw))*((dr*Q)/(pi*rw*T))

H(1,j+1)=h1jplus1

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Answer 1

Samatha Aleti 2020-3-24

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Hi,

You can generalize it by using arrays and loops as follows:

H = [1 2 3 5;  4 5 6 5; 7 8 9 5]; % let 
a = 1; 
% Changing values of 1st row  
for j = 1:size(H,2)-1 
h21=H(2,j) 
h11=H(1,j) 
h12= a*h21+(1-2*a)*h11; 
H(1,j+1)=h12 
end 