# Gruoping,deletting, changing

1. Sep 19, 2004

### kronecker

gruoping,deleting, changing

i am a college student, i yesterday ran into these two problems, and now i have some questions.

<1> in xOy, there are lots of dots, each of which is, lets represent them by, say, $$(x_i,y_i)$$, i=(0,n).
i like to group those dots together under certain constraints/conditions, so sure there will be servral groups created.
After you read my above problem, can you tell me possible solutions that come naturally to your mind (without using any high maths knowledge) ? anything, even jokes relating to ways of grouping them together are also very welcome..thankful

<2> I have hundreds of lines of hundreds of bits standing next to each other, ie
Code (Text):
........1010101010010.......
........0101010100111.......
........0101010000000.......
...................................
do you have any ideas on how to rewite the whole long bit string in a way which only matched ones (1's) are allowed, any other mismatched bits will be, say, changed into zero's ?