How to solve multiple equations dependent on each other?

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Hi
How to code this situation?
I have two equations, which are dependent on each other. Y=2X+5----(1) and X=2Y+5-----(2) The initial value of X=1, then I have to solve these equation repeatedly for 10 times.
Thanks

Risposta accettata

Niels
Niels il 30 Gen 2015
Since you depend on your previous answers, you can simply loop through the equations and store the answers.
x = ones(1,10); % also contains your initial x
y = ones(1,10); % just to preallocate y as well
for i=1:9 % loop 9 times
y(i) = 2*x(i) + 5; % calculate the y-value
x(i+1) = 2*y(i) + 5; % calculate the 'next' x-value
end
y(10) = 2*x(10) + 5; % finish off by calculating the final y-value
If you only care about the final value, this suffices:
x = 1;
for i=1:9
y = 2*x + 5; % calculate the y-value
x = 2*y + 5; % calculate the 'next' x-value
end
y = 2*x + 5;

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