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Re: Select x s.t. y>10


Hi Jason,

In[1]:= li=Table[{n^2,n},{n,10}];

In[2]:= Cases[li,x_?(#[[2]]>5&):>(x[[1]]),1,1]

Out[2]= {36}

Jurgen

Jason Gill wrote:

> I came across what seems like it should be a simple little function, but
> could not come up with a clever way to implement it.  Generally, what I
> am trying to do is take a list of lists of length 2 ie a list of x,y
> coordinates, and Select x values based on some criterion for y.  For
> example I want to select the first x value for which the corresponding
> y is greater than 5.
> I can write a function using Position and Take etc. , but there must be
> a clever,and more efficient way to do this.  Any thoughts... Jason
>
> --
> Jason Gill
> IBM Microelectronics
> Essex Junction, VT 05452
> Phone   (802)769-3350
> Fax     (802)769-1220
> email:  jgill at vbimail.champlain.edu
>            jasongil at us.ibm.com





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