EigenChineseDocument

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看了官方教程，cg slover可以是matrix-free，但是没明白这是什么意思，是要自己构造一个class而不同eigen官方的matrix？

crazyi

编译错误问题

1

## Subject 编译时存在未声明的变量，错误信息如下： ```shell In file included from /home/wtc/Project/EigenChineseDocument/Eigen/chapter3_test.cpp:1: ~/Project/EigenChineseDocument/Eigen/Chapter3_SparseLinearAlgebra/Section1_SparseMatrixManipulations.hpp: In function ‘void Chapter3_SparseLinearAlgebra::Section1_SparseMatrixManipulations::TheSparseMatrixClass()’: ~Project/EigenChineseDocument/Eigen/Chapter3_SparseLinearAlgebra/Section1_SparseMatrixManipulations.hpp:133:42: error: ‘rows’ was not declared in this scope 133 | SparseMatrix mat(rows, cols); | ^~~~...

Jas0nG

有关Issue #2 的修复

Jas0nG