solution for differntial equation?

2013 5 22

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i want to solve these system of equation numerically in mathlab

dp/dl=-.0000358*(t/p)
dt/dl=.00000467*(dp/dl)-.00454*t+.1816
@l=0   t=55 &p=93

Thanks for help

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Andrei Bobrov 2013-5-22

0 个投票

Let your function: funs

function y = funs(t,x)
y = zeros(2,1);
y(1) = -.0000358*(x(2)./x(1));
y(2) = .00000467*y(1)-.00454*t+.1816;

solution

[T Y] = ode45(@funs,[0 500],[93 55]);

midors84 2013-5-22

it gives this error ??? Input argument "x" is undefined.

Error in ==> funs at 3 y(1) = -.0000358*(x(2)./x(1));

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