How do you stop the rest of a script from running after a loop break?

I have attached my code, Where I am trying to use if statement inside a while loop to break the loop if a certain condition was not met. I don't want the rest of the script to run as the loop is broken. Any ideas on how this can work?

X1=input('First Initial Guess')%Input First guess for tm
X0=input('Second Initial Guess')%Input Second guess for tm
for i=1:N %iterating from 1 to N for DOT and Time
  f = @(X1) ((-(100-DOT(i)))/(100))+(1/(X1-60))*(X1*exp(-Time(i)/X1)-60*exp(-Time(i)/60));%anonymous function solving for the initial condition
  f = @(X0) ((-(100-DOT(i)))/(100))+(1/(X0-60))*(X0*exp(-Time(i)/X0)-60*exp(-Time(i)/60));%anonymous function solving for the second guess of tm
  n=0;% iteration counter
  while abs((f(X1)))>0.001 %While statment, if satisfied the loop will stop and move to next i
      X2=X1-((X1-X0))*(f(X1)/(f(X1)-f(X0)));% the new value of tm calculated using Newton-Raphson Method, where it eventually converge to a final value
      n=n+1%the counter of the numbers of while loop ran before the statment condition is satisfied 
      X0=X1;%setting the second conditon as intital condition to solve f(x0)
      X1=X2%setting the new value as the second conditoin to solve for f(x1 the new value of x2
      if n>100 %if X1 doesnt converge to exact root (Keep looping)
          disp('Consider Changing Your Initial Guesses')%Display a Guiding message
          break %breaks out the loops
      elseif X1==Inf || X1==-Inf
          disp('Consider Changing Your Initial Guesses')%Display a Guiding message
          break %breaks out the loops
      end
  end
  Counter(i)=n; %The number of while loops for every i is stored in a vector
  tm(i)=X1;% the values of calculated tm for every i is stored in a vector
end
tm_Average=mean(tm)%the average of tm (seconds)
%solving for KlA (Dissolving Rate)
KLa=(1/tm_Average)*(3600)% The Dissolving Rate per hour
KLA=(tm.^-1)*3600;%Individual KLas(1/hr) for each tm
%Copying the outputs in Excel file (OutputData)
xlswrite('OutputData.xlsx',tm',1,'A2:A1000')
xlswrite('OutputData.xlsx',KLA',1,'B2:B1000')
xlswrite('OutputData.xlsx',Counter',1,'C2:C1000')
xlswrite('OutputData.xlsx',KLa,1,'E2:E2')
xlswrite('OutputData.xlsx',tm_Average,1,'D2:D2')

Answer 1

[Star Strider]

I am not certain what you want to do. Replacing break with return will stop the script, in addition to breaking the loop.

Experiment to get the result you want.

[Khalil Ishaq]

I want to break the loop and stop the script.I tried return and break commands but the xlswrite command will still run.

[Star Strider]

In that instance, keep the break calls as they are because they’re doing what you want them to. Don’t replace them.

Instead, I would set a flag in the if/elseif blocks, and then test it at the end of the loop to do the return, something like:

        if n>100 %if X1 doesnt converge to exact root (Keep looping)
            disp('Consider Changing Your Initial Guesses')%Display a Guiding message
            brk_flg_1 = true;                       % Set Flag
            break %breaks out the loops
        elseif X1==Inf || X1==-Inf
            disp('Consider Changing Your Initial Guesses')%Display a Guiding message
            brk_flg_2 = true;                       % Set Flag
            break %breaks out the loops
        end

Then somewhere after the end call, test for the flags and execute the return. For example:

end                                 % <— End Of ‘for’ Loop
if (brk_flg_1 || brk_flg_2)         % Test Flags, ‘return’ If Either Is Set
    return
end
tm_Average=mean(tm)%the average of tm (seconds)
< REST OF YOUR CODE >

You will have to define the logic to do what you want. This is the essential approach I would use.