MATLAB: Trigonometri Problems at atand and acosd

mathematics

Hi.. can you help me pls.. I have a problem :

    54.8=acosd(20/(100-z))-atand(40/(500-z))

how to evaluate z at matlab? thanks..

Best Answer

This is perfect for the FZERO function....

fzero(@(z) 54.8-acosd(20./(100-z))+atand(40./(500-z)),30)

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MATLAB: How to obtain minimum values from fsolve (maximum values not needed) and plot the result.

First part:

x0 = [x0;x0;x0;x0;x0]; %Initial points

options = optimset('Display','iter');
zvals = 0 : 2 : 50;
numz = length(zvals);
x = zeros(5, numz);
fvals = zeros(1,numz);
for K = 1 : numz
  z = zvals(K);
  [x(:,K),fvals(K)] = fsolve(@(x) Man(x,z), x0, options)
end

Second part:

x0 = [x0;x0;x0;x0;x0]; %Initial points
zvals = 0 : 2 : 50;
numz = length(zvals);
x = zeros(5, numz);
fvals = zeros(1,numz);
for K = 1 : numz
  z = zvals(K);
  [x(:,K),fval(K)] = fmincon(@(x) F(x,z), x0, [], [], [], [], zeros(5,1), 2*pi*ones(5,1));
end
plot(zvals, fval)

MATLAB: Zeros of Bessel functions

Why not just use FZERO?

 zroot = fzero(@(z) besselj(1, z), 3)
 besselj(1, zroot) % Should be small

Best Answer

Related Solutions

MATLAB: How to obtain minimum values from fsolve (maximum values not needed) and plot the result.

MATLAB: Zeros of Bessel functions

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