Re: [eigen] eigen sqrt compilation error |

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*To*: eigen@xxxxxxxxxxxxxxxxxxx*Subject*: Re: [eigen] eigen sqrt compilation error*From*: Mark Borgerding <mark@xxxxxxxxxxxxxx>*Date*: Fri, 19 Jun 2009 09:13:16 -0400

* easy to get everything from Eigen you could possibly want with one include

It seems like a good philosophy.

-- Mark Benoit Jacob wrote:

oh and there is another "nuclear option": add a convenience #include<Eigen/Eigen> that includes them all. And then keep the separate headers for the users who want every % of compilation speed. The idea is that Core and Array are the 2 biggest modules, so Eigen/Eigen won't be much slower than including them two. Benoit 2009/6/19 Benoit Jacob <jacob.benoit.1@xxxxxxxxx>2009/6/19 Gael Guennebaud <gael.guennebaud@xxxxxxxxx>On Fri, Jun 19, 2009 at 12:29 PM, Patrick Mihelich <patrick.mihelich@xxxxxxxxx> wrote:On Fri, Jun 19, 2009 at 12:37 AM, Moritz Lenz <mlenz@xxxxxxxxxxxxxxxxxxxxxxx> wrote:Considering the number of times people make this error (forgetting to include it), what about including it by default? Is there a very good reason not to do it?I wonder this too. I ran into this error when I started using Eigen, and it seems to pop up regularly on the list. What exactly is the cost of including <Eigen/Array> in the core? How much does it increase compile times?on my high end computer with gcc 4.3.2 -O2 -DNDEBUG, much less time than to compile: Vector3f a, b; cout << a+b;, so something around 0.02 sec.On my computer I tried this program: #include <Eigen/Core> //#include <Eigen/Array> using namespace Eigen; int main() { Matrix3d m = Matrix3d::Identity(); Matrix3d n = m+m; Vector3d v; v << 1, 2, 3; Vector3d w = v+v; w = m * w; std::cout << w << std::endl; } with g++ 4.3.3. I repeated the compilation 10 times. The #include<Eigen/Array> increases compilation times by 2.5% and the memory usage is not affected. I'm OK to consider this reasonable, especially as other modules like Geometry already include Array. What's your opinion? The next question would be: should we merge the Array/ files into Core/ or just #include<Array> in Core. Benoit

**Follow-Ups**:**Re: [eigen] eigen sqrt compilation error***From:*Rohit Garg

**References**:**[eigen] eigen sqrt compilation error***From:*Rohit Garg

**Re: [eigen] eigen sqrt compilation error***From:*Gael Guennebaud

**Re: [eigen] eigen sqrt compilation error***From:*Moritz Lenz

**Re: [eigen] eigen sqrt compilation error***From:*Patrick Mihelich

**Re: [eigen] eigen sqrt compilation error***From:*Gael Guennebaud

**Re: [eigen] eigen sqrt compilation error***From:*Benoit Jacob

**Re: [eigen] eigen sqrt compilation error***From:*Benoit Jacob

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