MATLAB: Fzero help

numeric equation solvingplot

y=@(T) I*T*sind(A)-(0.5*G*(T^2));
root = fzero(y, 0)

abouve eqation is for a projectile that projected at an angle (gose in a kind of ar half oval shape)

want to find the time it hist ground but fzero only gives me the biginning which is 0

Best Answer

The anwser is in the comments above

From Matt Fig

rt = 0; 
d = .1; 
cnt = 1; 
while rt<.1 
rt = fzero(y,rt+d*cnt); 
cnt = cnt + 1; 
end

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Here is a simpler approach:

x = (-2:0.01:2);
y = @(x) 2*x.^4-3*x.^2+x-7;
plot(x,y(x)); hold on;
cnt = 1; 
for ii = -2:.5:2;
   rt(cnt) = fzero(y,ii);
   cnt = cnt + 1;
end
rt = unique(round(rt*1e10)/1e10); 
plot(rt,zeros(size(rt)),'or')

Best Answer

Related Solutions

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