## Comparison of two Vektors with different size to find variables

### Josef Bubendorfer (view profile)

on 13 Nov 2019 at 1:23
Latest activity Commented on by Walter Roberson

### Walter Roberson (view profile)

on 13 Nov 2019 at 15:41

### James Tursa (view profile)

I have a problem with my read measurement datas.
A vector has a not quite continuous time series of 15 minutes values ​​for a period of 7 years. The second vector or matrix has a continuous (precipitation) time series of 15 minutes values. I have already tried a few things, but I can not come up with a solution to get a vector with the precipitation values ​​corresponding to the "correct" date from the first vector.
An example of my problem:
a = [731947,312500000
731947,322916667
731947,333333333
731947,364583333
731947,375000000
731947,395833333
731947,406250000]
b = [731947,312500000 2
731947,322916667 5
731947,333333333 6
731947,343750000 8
731947,354166667 2
731947,364583333 0
731947,375000000 0
731947,385416667 0
731947,395833333 0
731947,406250000 0]
c= [731947,312500000 2 %This should be the result.
731947,322916667 5
731947,333333333 6
731947,364583333 0
731947,375000000 0
731947,395833333 0
731947,406250000 0]

### James Tursa (view profile)

on 13 Nov 2019 at 1:34
Edited by James Tursa

### James Tursa (view profile)

on 13 Nov 2019 at 1:36

E.g.,
x = ismember(b(:,1:2),a(:,1:2),'rows');
c = b(x,:);
Depending on how the times were constructed, you might need to use ismembertol( ).

Walter Roberson

### Walter Roberson (view profile)

on 13 Nov 2019 at 2:09
I suspect ismembertol() will be needed.
Josef Bubendorfer

### Josef Bubendorfer (view profile)

on 13 Nov 2019 at 12:37
x = ismember(b(:,1:2),a(:,1:2),'rows');
c = b(x,:);
Thanks for the fast answer. I had to bring the Vektors to same size (with zeros) and then it was working.
Walter Roberson

### Walter Roberson (view profile)

on 13 Nov 2019 at 15:41
The notation you used for the data was ambiguous. We could not tell whether you had two columns in a or if you were using comma to represent decimal point. But you talked a as being a vector and you show space as a column separator for b, so the evidence is that you are using comma as decimal, but your code is what would be expected if you are using two columns to represent the time instead of comma as decimal indicator.