Code will not display getting error
1 view (last 30 days)
Show older comments
David Hughes
on 16 Jul 2015
Commented: David Hughes
on 16 Jul 2015
I am getting an error on line 14 it will not display B. Any suggestions? This is the code:
A=[1 2 3;4 5 6;7 8 9]
[m,n]=size(A);
while j<=n
i=1;
sum1=0;
while i<=m
sum1=sum1+A(i,j);
B(i,j)=sum1;
i=i+1;
end
j=j+1;
end
disp(B)
0 Comments
Accepted Answer
the cyclist
on 16 Jul 2015
I could not run your code, because j is not yet defined before you enter the loop. I initialized j to 1, and then it worked (and displayed B):
A=[1 2 3;4 5 6;7 8 9]
[m,n]=size(A);
j=1;
while j<=n
i=1;
sum1=0;
while i<=m
sum1=sum1+A(i,j);
B(i,j)=sum1;
i=i+1;
end
j=j+1;
end
disp(B)
But I don't know if that's exactly what you need.
More Answers (1)
Steven Lord
on 16 Jul 2015
When you ask about an error, you should include the full, exact text of the error message rather than paraphrasing it.
But in this case, I suspect I know what's going on. What if j <= n is false when you reach your WHILE loop? The body of the WHILE loop will never execute. If B did not exist when you reach your WHILE loop, that will mean it won't exist when you try to display it. [That would mean that if j <= n was true that it was created inside the loop the first time you tried to assign into it. You should avoid doing that; search the documentation for the term "preallocation" for more information.]
See Also
Categories
Find more on Loops and Conditional Statements in Help Center and File Exchange
Products
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!