# Returning only positive values of a data set

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jacob Mitch am 24 Nov. 2019
Beantwortet: Star Strider am 24 Nov. 2019
If I a 3 row data set how would I return a new data set that only considers positive row 1 values for the first row
so If
Data=[1,-1,2,-1,3,4,5,-6;%x
1,2,3,4,-6,7,7,8;%y
6,2,3,4,5,6,7,8]%z
I want to get create a new data set with only x>0 values together with the corresponding y and z position values. So Im just getting rid of x<0 and corresponding y,z values So I would get
NewData=[1,2,3,4,5;%only positive x values
1,3,-6,7,7;6,3,5,6,7] %corresponding values in in that position%
%
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### Antworten (1)

Star Strider am 24 Nov. 2019
You cannot do exactly as you want, because the resulting matrix dimensions would not be compatible.
Likely the best you can do is:
Data=[1,-1,2,-1,3,4,5,-6;%x
1,2,3,4,-6,7,7,8;%y
6,2,3,4,5,6,7,8]%z
Pos = NaN(size(Data));
Lm = Data > 0;
Pos(Lm) = Data(Lm)
producing:
Data =
1 -1 2 -1 3 4 5 -6
1 2 3 4 -6 7 7 8
6 2 3 4 5 6 7 8
Pos =
1 NaN 2 NaN 3 4 5 NaN
1 2 3 4 NaN 7 7 8
6 2 3 4 5 6 7 8
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