Re: Re: real newbie question

• To: mathgroup at smc.vnet.net
• Subject: [mg64443] Re: [mg64421] Re: real newbie question
• From: Pratik Desai <pdesai1 at umbc.edu>
• Date: Fri, 17 Feb 2006 04:11:53 -0500 (EST)
• References: <200602160805.DAA29904@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Bill Rowe wrote:

>On 2/15/06 at 3:32 AM, Skip.Egley at synopsys.com (Skip Egley) wrote:
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>>Sorry for the newbieness. This is probably a piece of cake for you
>>folks.
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>>I have a set of Brillouin zone data. That is, there's a kx, ky, and
>>a kz followed by an energy value. How can I select particular
>>directions in the Brillouin zone out of this data and make a 2D
>>plot of it. A k value followed by an energy value. For instance,
>>say I want to plot along the kx axis. I would need to select all kx
>>values such that ky and kz were zero and grab the matching energy
>>value for the kx value. Or if I wanted to plot along a (110)
>>direction, I would need to grab all kx=ky values with kz=0, along
>>with the corresponding energy. Get my drift?
>>
>>
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>>Once I have the data I do know how to plot it (not that much of a
>>newbie) :)
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>So, I take it your problem is how to select the desired values from the original data structure. There are a number of ways this can be done using Select, Cases or Pick. Assuming the data looks like a list of (kx,ky,kz,energy} values,
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>Cases[data, {_,0,0,_}]
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>would give you all instances where ky=kz=0 and
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>Cases[data,_{a_,a_,0,_}
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>would give you all instances where kx=ky and kz = 0
>--
>To reply via email subtract one hundred and four
>
>
>
One can also use Expect with cases, I just found this recently

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