find all subsequence from a series.

I have a series containing 250 points.I need to find all the subsequences of it.Then any subsequence contain point 0.4 then I need to choose that subsequence only.How it is possible.Please help me.

Edit Rik (inserting the text of the duplicate question):

I have a set of numbers.I pollted it.I need to find all the subsequence of it and need to plot

If a=[1,2,3,4,5,6,7,8,9,0.4,0.1,0.23]

subsequence like{'1:2,2:3,3:4,.........'}

How can I do this,and I need to find a point (suppose 2)in the graph or not then marking that point in that subsequence.I am new in matlab.Please help me.

[Silpa K]

If it contain more than a point like k=[0.4,0.3,0.5].Then how extract those subsequence that contain any of those points.

[Geoff Hayes]

Silpa - please clarify what you mean by all the subsequences. How are you defining a subsequence given those 250 points?

[Silpa K]

I plot a graph ,that points are in a series.I need to find the all subseries of it.If I use like

c=a(37:66) then only that portion is getting,how I getting all those subseries.

[Silpa K]

I attached a data set here.I need to split each row that contain 30(or any number) points.How can I do that? Please help me.