How to store each iteration value and plot it ?
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Hi everyone I would like to store each L2 values after each iteration and plot it vs iteration number. How can I do it with the attached code?
clc;
clear all;
n=input('Enter the no of iterations : \n');
N=n+1;
a=input('\n Enter lower limit : \n');
b=input('\n\nEnter upper limit : \n');
fold=1;
fnew=1;
func = @(x)(.65-[.75/(1+x^2)]-.65*x*atan(1/x));
for i=1:N
if i==1 || i==2
f(i)=1;
continue;
end
f(i)=fold+fnew;
fold=fnew;
fnew=f(i);
end
L2=(b-a)*f(N-2)/f(N);
j=2;
while j<N
L1=(b-a);
if L2>L1/2
anew=b-L2;
bnew=a+L2;
else
if L2<=L1/2
anew=a+L2;
bnew=b-L2;
end
end
k1=func(anew);
k2=func(bnew);
if k2>k1
b=bnew;
L2=f(N-j)*L1/f(N-j+2);
else
if k2<k1
a=anew;
L2=f(N-j)*L1/f(N-(j-2));
else
if k2==k1
b=bnew;
L2=f(N-j)*[b-a]/f(N-(j-2));
j=j+1;
end
end
end
j=j+1;
end
disp(a);
disp(b);
采纳的回答
dpb
2018-8-31
Preallocate for L2 and keep and increment an index inside the loop and store into an array
L2=zeros(N,1); % preallocate
L2(1)=(b-a)*f(N-2)/f(N); % save initial value
j=2;
while j<N
L1=(b-a);
if L2>L1/2
...
every store is then
L2(j)=...;
Or, change to counted for loop instead of while since there's no conditional exit.
L2(1)=...;
for j=2:N-1
...
L2(j)=...;
...
BTW, Matlab "elseif" is one string, I had to reformat code to try to read it for indention levels being all fouled up where you wrote
...
else if L2<=L1/2
...
Rewrite
if L2>L1/2
anew=b-L2;
bnew=a+L2;
else
if L2<=L1/2
anew=a+L2;
bnew=b-L2;
end
end
as
if L2>L1/2
anew=b-L2;
bnew=a+L2;
elseif L2<=L1/2
anew=a+L2;
bnew=b-L2;
end
which since the 'elseif' is the negation of the 'if' condition, this is really
if L2>L1/2
anew=b-L2;
bnew=a+L2;
else
anew=a+L2;
bnew=b-L2;
end
there's no need for the conditional if on the else clause here.
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