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- To: eigen@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [eigen] Array question (maybe a bug)
- From: Gael Guennebaud <gael.guennebaud@xxxxxxxxx>
- Date: Mon, 18 Jan 2010 22:58:33 +0100
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oops, that's fixed now.
gael
On Mon, Jan 18, 2010 at 6:37 PM, Trevor Irons <trevorirons@xxxxxxxxx> wrote:
> Is this expected?
>
> #include "Eigen/Core"
> #include "Eigen/Array"
>
> using namespace Eigen;
>
> int main() {
> VectorXd y(3);
> double rams=1.25;
> VectorXd kk(4);
> kk << 0.1, -0.1, -0.1, .1;
> y = rams-kk.array(); // Wrong answer
> //y = -kk.array()+rams; // OK
> for (int i=0; i<4; ++i) {
> std::cout << y[i] << "\t" << (rams - kk[i]) << std::endl;
> }
> return 0;
> }
>
> Returns, where I was thinking they would be equivalent.
>
> tirons@baboon:~/sandbox/eigen$ ./min
> -1.15 1.15
> -1.35 1.35
> -1.35 1.35
> -1.15 1.15
>
> I get the expected answer with -kk.array() - rams.
> Is this a bug, or am I missing something with how array's work?
>
> Thanks,
> Trevor
>