How to change two variables in one loop?

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Ani Asoyan
Ani Asoyan 2020-7-13
评论： Ani Asoyan 2020-7-14
Hi... I have something like this..
d(1)=0.3
a(1)=0.5
for i=1:5
/some code/
a(i+1)=a(i)-0.5*p
d(i+1)=d(i)-0.3*p+0.5*N
end
p and N are parameters,, and I want to change a and d variables in this loop simultaneously.. how can I do that? Thank you .

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回答（1 个）

the cyclist
the cyclist 2020-7-13
编辑：the cyclist 2020-7-13
There are many things about your question that I don't fully understand. The least important is whether you meant the loop to go over k rather than i. If not, then I don't understand how i is supposed to be used.
Most importantly, I don't really understand what you mean by "simultaneously" here. Do you mean that you want to somehow execute
a(k+1)=a(k)-0.5*p
and
d(k+1)=d(k)-0.3*p+0.5*N
in a single line of code?
Why? These two lines of code do not affect each, and could be executed in either order, with same result.
You could define a function that returns a and d "simultaeously", but I'm not sure of the point of that.
Maybe I just don't fully understand your question.
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the cyclist
the cyclist 2020-7-14
编辑：the cyclist 2020-7-14
When I turn that code, I get a different error. When MATLAB calls the line
g=(u_g( Z(:,1), Z(:,3), Z(:,2) ).');
I get the error
Unrecognized function or variable 'u_p'.
because
u_g = @(x, x_e, N)(-0.5*a.*x.^2+b*(x-x_e)-c*(N.^l)+e*u_p(x,x_e,N,d(k)));
and u_p is not defined in your code.
Ani Asoyan
Ani Asoyan 2020-7-14
yeah sorry because there's a function called u_p ,,,here's its code
function u=u_p(x,x_e,N,d)
d=0.7-0.6*x+0.4*N
u = -(x-x_e).^2+N.*d;
end

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