Solve an eqution in matlab

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ana take
ana take 2017-1-9
评论： Niels 2017-1-16
Hello! How can I write this equation in matlab: The variable here is t, all other variables including Rt are known.I want to find t by solving D(t)=R(t).

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Niels
Niels 2017-1-9
编辑：Niels 2017-1-9
D(t)=R_t
<=> D(t)-R_t=0
use fzero
tSolution=fzero(D(t)-R_t,0)
but care, the output can be contain more than 1 solution, if D and R have more than 1 intersection point
  2 个评论
ana take
ana take 2017-1-13
Here x, y,teta are vectors.When I call the function fzero it shows this message:fzero(@(t)shkruajek(x,y,1,3,teta,0.1,4,t),0)
Exiting fzero: aborting search for an interval containing a sign change
because NaN or Inf function value encountered during search.
(Function value at -2.54232e+306 is NaN.)
Check function or try again with a different starting value.
ans =
NaN
can you help me to determine where is the problem here??
function [ek]=shkruajek(x,y,i,j,teta,speed,R,t)
ek=sqrt(((x(i)+ speed*cos(teta(i)*t)) - (x(j) + speed*sin(cos(teta(j)*t))))^ 2+ ((y(i) + speed*sin(teta(i)*t)) - (y(j) + speed*sin(teta(j)*t))).^ 2)-R;
end
a=fzero(@(t)shkruajek(x,y,i,j,teta,speed,R,t),0);
Niels
Niels 2017-1-16
this means that the function has no roots... maybe plot the function first or check if it has a sign change. Did you enter the right function?

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