Re: [eigen] MatrixX multiply |

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*To*: eigen@xxxxxxxxxxxxxxxxxxx*Subject*: Re: [eigen] MatrixX multiply*From*: "Steven große Deters" <steven.grossedeters@xxxxxxxxx>*Date*: Thu, 15 Feb 2007 16:18:49 +0100*Domainkey-signature*: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:references; b=BNXDgahJrqxJvbxqJA3xGJ+fTB+4QO71Jyq002yRUfTuTl+UCseAhLMWmeOXknV91v32Ja4DQIgRKNNn/RVBQrXWdPM8ESzMhvDgkaelDdxnoDG1cELMGLqgqmURpxlqlX2nzCPN814tfCz493Pky/0boLWhZ5ccQKZ+lUfn5I8=

Currently, Eigen doesn't provide any function for entry-by-entry product. The

reason is, that I have never seen a real-world use for that operation.

If you have a real need for it, could you explain it to me? If it's

convincing, i'll add it to the Eigen API for the next minor update ( 1.0.4).

That is a little difficulty to explain. In short: I am calculating a Gaussian function for an image which describes the probability densities of the colour distribution. This is used for image segmentation.

As a part of this calculation a covariance matrix (I don't know if that's the proper term in english) is needed. In order to calculate the covariance matrix I need the entry-by-entry product.

(this explanation might not be totally correct - I am unfortunately not the mathematical master mind of this project)

Steven

**Follow-Ups**:**Re: [eigen] MatrixX multiply***From:*Benoit Jacob

**References**:**[eigen] MatrixX multiply***From:*Steven große Deters

**Re: [eigen] MatrixX multiply***From:*Benoît Jacob

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