How can I create a table containing all iterations?

Question

Emily 2020-9-13

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/593089-how-can-i-create-a-table-containing-all-iterations

回答： Ayush Gupta 2020-9-17

I need to have a table containing iter, xr, func(xr), and es for each iteration of the loop. I have tried listing them as arrays but cannot seem to get that to work.

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
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);  
end
root=xr;

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Answer 1

Ayush Gupta 2020-9-17

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/593089-how-can-i-create-a-table-containing-all-iterations#answer_495985

在 MATLAB Online 中打开

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