Returning only positive values of a data set

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%  
                                                                              %

Answer 1

[Star Strider]

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