Isolate Elements in a Vector

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T
T 2013-1-24
Suppose I have two sets of data:
ab =
0.3570
0.3560
0.3750
0.5150
0.3570
0.3560
0.3750
0.5150
and
ab =
0.4100
0.2500
0.3340
0.5500
0.6250
0.7760
0.3330
0.4100
0.2500
0.3340
0.5500
0.6250
0.7760
0.3330
0.4100
0.2500
0.3340
0.5500
0.6250
0.7760
0.3330
0.4100
0.2500
0.3340
0.5500
0.6250
0.7760
0.3330
0
As you see with the set ab, the numbers repeat itself:
0.3570
0.3560
0.3750
0.5150
and with second set ab:
0.4100
0.2500
0.3340
0.5500
0.6250
0.7760
0.3330
But also note that there is a zero at the end of the second set.
Now if I wanted to construct a vector using one set of data, I would use the following command for the second set to remove that zero
reshape(ab(1:end-1), [], 4);
This would read the vector from the first element to the last, being 0 and remove it with end-1. This also assumes that there are 4 runs.
Obviously this wouldn't work for the first set.
What would I need to change for this to read both sets and to prompt the user how many runs of data there are?

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Azzi Abdelmalek
Azzi Abdelmalek 2013-1-24
编辑：Azzi Abdelmalek 2013-1-24
If you have just these two cases
if ab(end)==0
ab(end)=[]
end
out=reshape(ab,4,[])
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Azzi Abdelmalek
Azzi Abdelmalek 2013-2-12
I guess because your ab becomes empty, to understand check this:
a=[];
if a(end)==0;
a(end)=[],
end
T
T 2013-2-13
Actually it would appear that the file in another directory didn't have any data at all!
How could I prompt the user to notify of such an occurence?

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