Re: [eigen] Using Eigen::Map to use eigen operations on my data |

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*To*: eigen@xxxxxxxxxxxxxxxxxxx*Subject*: Re: [eigen] Using Eigen::Map to use eigen operations on my data*From*: Benoit Jacob <jacob.benoit.1@xxxxxxxxx>*Date*: Thu, 29 Oct 2009 18:21:02 -0400*Dkim-signature*: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:content-type :content-transfer-encoding; bh=0p/0udGfPT21oShX1NsPPEXjNgZLz3mdETKNaF2t8Uo=; b=H53NdKU7+MLABdgZEv5i6RfB1rrxySnljnum5UiAwyNKoESvh7Hh8OE/we9lEkljRT 7DQcuY/fLpC5gmqbqpCSmG0nyuAd617CifwJQG98GdpByBpKnjFIa4cgtX5o+lCn8hcO /CD0iVAKPD4drdZTVqYAcZB/nVeNd+2KLSUZQ=*Domainkey-signature*: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:content-transfer-encoding; b=Rp7hFFma+HmtrFIOMPCjnIBh0NItnXlUZGorM8kLvvLQRvhfqhKaZn1E/5+zQSGN7g tWntzjhSyPqoxKGoiKXB8IhKJveBwO7XKlhT1YQlnOSFwzAaF2815ErYkaPqGNFZe8Fx BhwBiJzI63j5N0Gqluc3CjjAuyTzafYEEIxsE=

2009/10/29 Robert Lupton the Good <rhl@xxxxxxxxxxxxxxxxxxx>: > I guess I boiled this down too far (boiled it dry?). > > I'm writing some swig bindings to pass numpy arrays to code that uses Eigen. > I can unpack the data from the numpy arrays, so I have a (float *data, int > nx, int ny) tuple. I'd like to pass that to my routines that expect > Eigen::MatrixXf. > > After Benoit's explanation, it looks as if I need to redo my interface to > expect Map<MatrixXf> or (to preserve the option of passing MatrixXf) > template them over the argument type --- for type safety, Benoit proposes > using MatrixBase<T>. Exactly! > > Fine, I can do that --- although the details of the swig typedefs will be > nasty as templates must be explicitly expanded. I can work on that. If you need only MatrixXf and Map<MatrixXf>, you could code these as 2 separate functions and do without templates. (They could internally call a common template function that would be an implementation detail). > I still think that the manual entry is confusing --- it maps an array and > then assigns it to a Matrix2f but all the mapping is doing is initialising > the memory. Indeed. I'll try to remember to clarify that. Benoit

**Follow-Ups**:**Re: [eigen] Using Eigen::Map to use eigen operations on my data***From:*Benoit Jacob

**References**:**[eigen] Using Eigen::Map to use eigen operations on my data***From:*Robert Lupton the Good

**Re: [eigen] Using Eigen::Map to use eigen operations on my data***From:*Benoit Jacob

**Re: [eigen] Using Eigen::Map to use eigen operations on my data***From:*Robert Lupton the Good

**Re: [eigen] Using Eigen::Map to use eigen operations on my data***From:*Benoit Jacob

**Re: [eigen] Using Eigen::Map to use eigen operations on my data***From:*Robert Lupton the Good

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