How to insert numbers into a empty vector in a loop

Hello,

I have a function and I want to insert sqra(5,5) that i I will get results of x and counter.

How to put all these results into a empty vector by loop ,so x=[] and counter=[] , because then I will have to create a graph.

Thanks for the helpers :)

function fOut = f(xIn,mIn,sIn)

fOut = (exp(-0.5*((xIn-mIn)/sIn)^2)/(sIn*(2*pi)^0.5));


function xOut = sqra(mIn,sIn)

format short    %fixed-decimal format with a total of 4 digits
epsilon = 1e-4;   

flag = 0;        %That use when condition need to stop for the "while" loop.
counter = 0;     %counts the number of iterations. Is used to prevent infinite loops.

x=0.5 ;          %Initial guess
while flag == 0
    %Check for infinite loop
    counter = counter + 1   
    if counter > 10000
        error('Too many iterations');
    end
   
    x=x+(x-mIn)/((sIn)^2)  %Calculating a formula Newton–Raphson method
    
    if abs((exp(-0.5*((x-mIn)/sIn)^2)/((sIn)*sqrt(2*pi)))) < epsilon  %Checking whether the function is close to zero. 
        flag = 1;      %If yes, flag is raised and the while loop stops.
    end
end

xOut = x;

Answer 1

[Rik]

You should not put it in an empty vector. You should put the results in an array:

[m,s]=ndgrid(1:5);
xOut=zeros(size(m));
counts=zeros(size(m));
for n=1:numel(m)
    [xOut(n),counts(n)]=sqra(m(n),s(n));
end

function [xOut,counter] = sqra(mIn,sIn)
epsilon = 1e-4;   
flag = 0;        %That use when condition need to stop for the "while" loop.
counter = 0;     %counts the number of iterations. Is used to prevent infinite loops.
x=0.5 ;          %Initial guess
while flag == 0
    %Check for infinite loop
    counter = counter + 1;
    if counter > 10000
        error('Too many iterations');
    end
   
    x=x+(x-mIn)/((sIn)^2);  %Calculating a formula Newton–Raphson method
    
    if abs((exp(-0.5*((x-mIn)/sIn)^2)/((sIn)*sqrt(2*pi)))) < epsilon  %Checking whether the function is close to zero. 
        flag = 1;      %If yes, flag is raised and the while loop stops.
    end
end
xOut = x;
end

[Anton Anton]

There is a problem with the function how to fix it.

[Rik]

Isn't the error message clear? The function and the file have the same name. Change one of them, or put the script part in a separate file.

Answer 2

[Bastian Arturo Romero Mardones]

You can try:

function [x0ut,count] = sqra(mIn,sIn)
 while 
  counter=counter+1;
  count(counter)=counter;
  x(counter) = x+...
 end
 x0ut=x;
 end

In main function:

[x0ut,count]=sqra(val1,val2)

[Anton Anton]

Did not work for me there is an error.