       Re: List Manipulation: Conditionally changing y value

• To: mathgroup at smc.vnet.net
• Subject: [mg109015] Re: List Manipulation: Conditionally changing y value
• From: Bob Hanlon <hanlonr at cox.net>
• Date: Sat, 10 Apr 2010 06:54:24 -0400 (EDT)

```n=5;

x=RandomReal[{0,1}, n];

y=RandomReal[{0,1}, n];

{a,b}={.25,.75};

filtered1=If[a<#[]<b,{1,0}#,#]&/@pts

or

filtered2={1,If[a<#[]<b,0,1]}#&/@pts

or

filtered3={1,1-Boole[a<#[]<b]}#&/@pts

filtered1==filtered2==filtered3

True

Bob Hanlon

---- Charles Koehler <cjkphd at wi.rr.com> wrote:

=============
Hello,

If possible I could use a little help on this.

I have a list of  x and y data and based on the value of x I would like to
manipulate the value y.

I joined the data using:

I assumed that by testing the x value using #[], I could change the value
of y using #[] as shown below.  If no manipulation was required based on
the value of x, I would keep that point unchanged, but I'm definitely
missing something.

filtered=If[a<#[]&<b,#[]&=0],{#[],#[]}&,pts]

a and b are the range of x values

Any insight would be much appreciated.

Thanks,

Chuck Koehler

```

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