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Bug 465 - Missing native support for pow(expr,expr) and pow(scalar,expr)
Summary: Missing native support for pow(expr,expr) and pow(scalar,expr)
Status: NEW
Alias: None
Product: Eigen
Classification: Unclassified
Component: Core - general (show other bugs)
Version: 3.1
Hardware: All All
: Normal Unknown
Assignee: Nobody
Depends on:
Reported: 2012-05-19 22:46 UTC by Gael Guennebaud
Modified: 2013-06-13 22:21 UTC (History)
3 users (show)


Description Gael Guennebaud 2012-05-19 22:46:11 UTC

Comment 1 Dale Lukas Peterson 2013-06-13 19:50:56 UTC
This would be really nice to have.  I tried recently to use the unsupported matrix power, and ran into a number of segfaults for very simple matrix powers:

#include <iostream>
#include <unsupported/Eigen/MatrixFunctions>
int main()
  Eigen::MatrixXcd A(2,2);
  A << 1, 1, 4, -2;
  // Segfaults:
  //Eigen::MatrixPower<Eigen::MatrixXcd> Apow(A);
  //std::cout << Apow(3.1) << "\n\n";

  // Segfaults:
  //std::cout << A.pow(3.1) << "\n\n";

  // Segfaults:
  //std::cout << A.pow(3.1).eval() << "\n\n";

  // Segfaults:
  //Eigen::MatrixXcd B(2,2);
  //B = A.pow(3.1);

I use matrix power a lot, it would be nice if this worked in Eigen.
Comment 2 Gael Guennebaud 2013-06-13 22:21:25 UTC
Actually this entry is about coefficient-wise power, see the function signatures. So let's continue your issue on bug 614.

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