how to break the loop
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I have a matrix p;
0.1996
0.4428
0.5227
0.8407
0.8929
0.9102
0.9528
0.8986
now, i only need points until they are increasing. Once the value decreases i need to break the loop and end the process. here i have tried to use the loop,
for i=1:length(p)
if p(i,1)<p(i+1,1)
one(i,:)=p(i+1,:)
else h=p(i,:)
end
end
but it only gives the result till 0.9102. I also want to include the value 0.9528 and then break the loop.(i need to break the loop here because my matrix is nearly 100*2 and this condition might be true in the next rows). What am i doing wrong?
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Guillaume
2018-1-11
What am i doing wrong?
- Using length with a matrix ( length can be the number of rows or columns)
- Indexing past the end of the matrix. When i is the index of the last row p(i+1, 1) is not valid. This will result in and index exceeds matrix dimension error
- Growing the one array inside the loop
- Using a loop
To break out of a loop, you use break.
for i = 1:size(p, 1) %do not use length on matrices!
if somecondition
dosomething
else
break; %quit the loop
end
end
But the loop is a complete waste of time:
idxstop = find(diff(p(:, 1)) < 0, 1); %find index of first value where the difference is negative
one = p(1:idxstop, :) %and extract all rows up to that index
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