Hello, i have this error log, and i don't know what that mean, Thanks

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mycode: /usr/include/Eigen/src/Core/Block.h:128: Eigen::Block<XprType, BlockRows, BlockCols, InnerPanel>::Block(XprType&, Eigen::Block<XprType, BlockRows, BlockCols, InnerPanel>::Index, Eigen::Block<XprType, BlockRows, BlockCols, InnerPanel>::Index) [with XprType = Eigen::Matrix<double, -1, -1>; int BlockRows = 2; int BlockCols = 2; bool InnerPanel = false; Eigen::Block<XprType, BlockRows, BlockCols, InnerPanel>::Index = long int]: Assertion `a_startRow >= 0 && BlockRows >= 1 && a_startRow + BlockRows <= xpr.rows() && a_startCol >= 0 && BlockCols >= 1 && a_startCol + BlockCols <= xpr.cols()' failed.


That mean you are calling the .block() method (or a similar one like middleRows, topLeftCorner, head, etc.) with out-of range values. Run your program in a debugger to see the call stack and find the respective line in your code.

Hello ggael and thanks for reply, sorry if my question is stupid but what do you mean by running the program in a debugger and how do that ? Thanks

Here is an example on linux:

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// Start GDB with your executable
$ gdb ./my_program
// Start your program by typing 'run':
(gdb) run
// wait for the assertion and then type 'bt' to get the backtrace:
(gdb) bt


Ok thanks ggael, i will try and let you know