MATLAB: How can i remove all the rows of a matrix who contain negative values

Question

Hi, i have a matrix w that i obtain with the code below with random numbers

rng(0)
  w_1 = (-0.25 + (1.25-(-0.25)).*rand(1,15))' ; a = ones(15,1); w_2 = a - w_1; w = [w_1, w_2]
w =
      0.9721    0.0279
      1.1087   -0.1087
     -0.0595    1.0595
      1.1201   -0.1201
      0.6985    0.3015
     -0.1037    1.1037
      0.1677    0.8323
      0.5703    0.4297
      1.1863   -0.1863
      1.1973   -0.1973
     -0.0136    1.0136
      1.2059   -0.2059
      1.1858   -0.1858
      0.4781    0.5219
      0.9504    0.0496

So how can i make a matrix that returns all the rows of w who contain only positive elements?

should turn into the matrix above

w= 
0.9721  0.0279
0.6985  0.3015
0.1677  0.8323
0.5703  0.4297
0.4781  0.5219
0.9504  0.0496

Answer 1

Use > and the all() function:

rng(0)
w_1 = (-0.25 + (1.25-(-0.25)).*rand(1,15))' ; 
a = ones(15,1); 
w_2 = a - w_1; 
w = [w_1, w_2]
allPositiveRows = all(w>0, 2)
wOut = w(allPositiveRows, :)