creating a function to solve non linear equations using simple iteration method

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mark
mark 2012-3-13
回答： Hafsa 2024-8-18
Create a Matlab function named (solveIteration) for solving a non-linear equation using (Simple iteration method) and takes the following inputs: g: function, x0 initial guess TolX as Termination tolerance on the function value, a positive scalar (when to stop iteration) and Maxiter as the max number of iterations if reached means the function has no solution The function returns the following outputs : x as a root(s) of the equation ,error as error message if the equation has no solutions Function seems like below one: function [x,error] = solveIteration(g,x0,TolX,MaxIter) ...
any hints ??
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mark
mark 2012-3-13
trying .. i just need the first steps as in the direction i need to get starting .. im new to matlap
mark
mark 2012-3-19
function [x,err] = solveit(g,x0,to,max)
syms x
x1=x0(1);
while subs(diff(g),x,x0)<=1
n=n+1;
if x1-subs(g,x,x1)<= to && n<= max
x1=subs(g,x,x1);
x=x1;
break
else
x=err;
end
end
end

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回答（2 个）

Sean de Wolski
Sean de Wolski 2012-3-13
doc fsolve
If you have the Optimization Toolbox.
Hafsa
Hafsa 2024-8-18
n = 3;
a = rand(n, n);
b = rand(n, 1);
% solve a * x + exp(x) = b for x
x = zeros(n, 1);
for itr = 1: 10
x = x - (a + diag(exp(x))) \ (a * x + exp(x) - b);
end

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