Hi Guys, I need help in writing code for finding difference between two successive values of a variable in for loop.

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Shah
Shah 2016-6-2
回答： Walter Roberson 2016-6-2
Actually, I am writing code for bisection method. Following is the part of code which repeats iterations of the method.
disp('iter a b s=(a+b)/2 y(s) yd')
% for loop starts here
for k=1:N
c=(a+b)/2;
if (f(c)==0)
root=c;
return
elseif (f(a)*f(c)<0)
b=c;
else
a=c;
end
s = (a+b)/2;
y = f(s);
%yd=y(k)-y(k-1);
iter = k;
out=[iter, a , b, s, y, yd];
fprintf(1,'%.0f %.05f %.05f %.05f %.05f %.05f\n',out') %
end
I want my stop the iteration process when difference between the values of the function at two successive approximations is less than a specified tol value. I don't know what to add in the above code to do so. I appreciate any help in fixing this problem. Thanks! Regards Shah

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回答（1 个）

Walter Roberson
Walter Roberson 2016-6-2
hint:
oldval = inf;
while true
newval = rand(); %some calculation to create a new value
if abs(oldval - newval) < tol
break;
end
oldval = newval;
end

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