The break statement in MATLAB is used to break out of a loop – a for or while statement, that is, it terminates the execution of the loop. Let’s suppose someone wants to find the value of k^2-50 for all integers in [-10,10] domain. The mfile for that is given below.

% For integers k=-10,-9,….,9,10,

% the function k^2-50 will take positive as

% well as negative values.

%For example, for k=-9, k^2-50=31; for k=1,

% k^2-50=-49; for k=8, k^2-50=14.

% The loop below will calculate values of k^2-50 for all values of requested k.

for k=-10:1:10

val=k^2-50;

end

___________________________________________________________

Let’s suppose now you are asked to calculate value of k^2-50 for all integers in [-10,10] domain but only until k^2-50 becomes negative.

% The loop below will calculate values of k^2-50

% for all values of the requested k

% until it turns negative

for k=-10:1:10

if (k^2-50<0)

break;

end

val=k^2-50;

fprintf(‘\n k=%g val=%g’,k,val)

end

____________________________________________________________

Can you do what you did above using the while statement. Yes, the MATLAB code is given below.

% Equivalent in while

% The loop below will calculate values of k^2-50

% for all values of the requested k until it turns negative

k=-10;

while (k<=10) & (k^2-50>0)

val=k^2-50;

fprintf(‘\n k=%g val=%g’,k,val)

k=k+1;

end

_______________________________________________________

This post is brought to you by Holistic Numerical Methods: Numerical Methods for the STEM undergraduate at http://nm.mathforcollege.com, the textbook on Numerical Methods with Applications available from the lulu storefront, and the YouTube video lectures available at http://nm.mathforcollege.com/videos and http://www.youtube.com/numericalmethodsguy

Subscribe to the blog via a reader or email to stay updated with this blog. Let the information follow you.