MATLAB: Using an or in a while loop.

MATLABwhile loop

I want to have an or statement in my while loop. Eventually I will be incrementing ea as well as iter. But right now it should exit out of the while loop after 100 iterations but it is continuing forever. What is wrong with the or statement? es = .01; imax = 100; iter = 0; ea = es;

while ((ea <= es )|| (iter <= imax) )
    iter = iter + 1;
end

disp(iter);

Best Answer

You need && for that rather than || . Your existing code does not exit the loop until both parts are false, which never happens since you do not change ea or es.

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MATLAB: False position infinite loop

Well you could tell us the values you used for f, xL, xR, tol when you called it. And you can use the debugger to figure out why "e" never falls below "tol". Using the debugger yourself will be your fastest course of action , rather than trying to debug it via back-and-forth Answers forum postings, which can take hours.

MATLAB: How to create a table containing all iterations

To create a table, store every instance of iter, xr, func(xr), and es at each iteration into a list that is globally and append each iteration to it. Refer to the following code on how to do it:

function[root,ea,iter]=secant(func,delta,xr,es,maxit,varargin)
if nargin<3,error('atleast 3 input arguments required'),end
if nargin<4|isempty(es),es=0.0001;end
if nargin<5|isempty(maxit),maxit=50;end
itr =[];
xr =[];
func_xr =[];
es =[];
iter=0;
while (1)
    xrold=xr;
    xr=xr-((delta*xr*func(xr))/(func(xr+(delta*xr))-func(xr)));
    iter=iter+1;
    if xr~=0, ea=abs((xr-xrold)/xr)*100;end
    if ea<=es|iter>=maxit,break,end
  funcxr=func(xr);  
  itr(i) = iter;
  xr(i) = xr;
  func_xr(i) = funcxr;
  es(i) = es;
end

Best Answer

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MATLAB: False position infinite loop

MATLAB: How to create a table containing all iterations

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