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[gaufung]

• chapter 08
  The prof. takes $b_1=1,b_2=5,b_3=6 $ for an example, so
  $
  \begin{eqnarray*}
  x_1 & + & 2x_3 & = & 1 \
  & & 2x_3 & = & 3 \
  \end{eqnarray*}
  $
  $
  \begin{eqnarray*}
  x_1 & = & -2 \
  x_3 & = & \frac{3}{2} \
  \end{eqnarray*}
  $

• chapter 16

$Pb$将会把向量投影在$A$的行空间中

Should be
$Pb$将会把向量投影在$A$的列空间中

[zlotus]

Thanks, I've the error in chapter 16.
But I don't get the equations mentioned in chapter 08, could you make a more specific description?

Thank you~

[gaufung]

解法：另所有自由变量取0，则有
X1+2X3 = 0
2X3 = 0
解得X1 = -2 X3=3/2

The Prof. took b1=1,b2=5,b3=6 for example which subjects to b3-b2-b1 =0 condition. So if we set free varibales =0 , we should get X1+2X3 = 1;2X3=3，and solve this equations.

[zlotus]

Sorry, my mistake.
Thanks a lot~