How to use If function to choose just some values of the matrix?

I have 10 points with x and y axis which is represented in matrix C: C =

   11.1902   78.9215
   43.7123   84.8152
   26.2182   55.0542
   89.4285   18.3821
   41.1215   32.8977
   62.8533  101.3337
   26.5649   25.2378
   70.1982   92.5817
   36.2971   63.8342
   75.4079  109.6135
The first column represents x axis, and second column indicates y axis.
I need to set conditions like:
If x positions of any 10 points is less than 5 or more than 60 (5>x>60),
 cancel that point (x,y) from the matrix.
Actually I tried like this, but something is wrong:
if length(find(C(:,1)<5| C(:,1)>60))~=0

end

At the end results should be like this: C =

   11.1902   78.9215
   43.7123   84.8152
   26.2182   55.0542
   41.1215   32.8977
   26.5649   25.2378
   36.2971   63.8342

Answer 1

[KSSV]

C = [11.1902   78.9215
   43.7123   84.8152
   26.2182   55.0542
   89.4285   18.3821
   41.1215   32.8977
   62.8533  101.3337
   26.5649   25.2378
   70.1982   92.5817
   36.2971   63.8342
   75.4079  109.6135] ;

x = C(:,1) ; y = C(:,2) ; 
idx = find(x<5 | x>60) ;

C(idx,:) = [];
C =

   11.1902   78.9215
   43.7123   84.8152
   26.2182   55.0542
   41.1215   32.8977
   26.5649   25.2378
   36.2971   63.8342