# How to solve this without goto statement?

3 views (last 30 days)
Amit Kumar on 16 May 2014
Commented: Amit Kumar on 16 May 2014
Hi all, I think it is bad that matlab doesn't have a goto statement (many people will strongly disagree, but excuse me for the same). I am not a great programmer and I do not know what alternative should be used in the following script:
m1=2140.67;
m2=0.2*m1;
F=440;
k1=0.7*1e6;
w1=sqrt(k1/m1);
c1=10; c2=0; c3=0;
for(k2=1e3:1:1e5)
for (w=18:1e-4:18.1)
x1 = 1/(((-m1*w^2+k1+k2)*(-m2*w^2+k2) - k2^2))*k2*F*1;
% if(abs(x1)>0.0025)
% { goto abc}
if(abs(x1)<c1 && abs(x1)<(0.0025))
c1=x1;
c3=k2;
else
end
end
%abc:
%continue;
end
fprintf('val : x1 = %4.6f m and k2 = %4.6f N/m \n',c1,c3);
There are 2 for loops in this script. I wish that for any value of w, if (abs(x1)>0.0025), the next iteration should begin in outer loop (not the loop of w, so 'continue' is not useful). So what should I do to get next iteration of outer loop i.e. next iteration of k? Had matlab been using goto, I could have employed what is given in % (comments).

Image Analyst on 16 May 2014
Edited: Image Analyst on 16 May 2014
I don't see a loop over k, just k2. But when that condition happens, put a break in the inner loop
if (abs(x1)>0.0025)
break;
end
and then outside the inner loop but inside the outer k2 loop, put this:
if (abs(x1)>0.0025)
continue;
end
x1 will still have the same value so that should work.
##### 2 CommentsShow 1 older commentHide 1 older comment
Amit Kumar on 16 May 2014
Thanks a lot!

the cyclist on 16 May 2014
I am not 100% I understand the logic you are trying to implement, but I think you want the break command.

Brian B on 16 May 2014
for(k2=1e3:1:1e5)
for (w=18:1e-4:18.1)
x1 = 1/(((-m1*w^2+k1+k2)*(-m2*w^2+k2) - k2^2))*k2*F*1;
if(abs(x1)>0.0025)
break;
elseif(abs(x1)<c1 && abs(x1)<(0.0025))
c1=x1;
c3=k2;
end
end
end

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