How can I delete a row of numbers in which the number in the first column is less than a threshold?

How can I delete a row of numbers in which the number in the first column is less than a threshold?

Answer 1

[Sean de Wolski]

glass half empty

X(X(:,1)<10,:) = [];

glass half full

Y = X(X(:,1)>=10,:);

[Sandy]

Thanks!

Answer 2

[Azzi Abdelmalek]

   A=rand(100,2) %example
a=A(1,:);
A(A(:,1)<0.2,:)=[];
A=[a;A]