例
[350750110]⎡⎢⎣350750110⎤⎥⎦
ステップ 1
Nullity is the dimension of the null space, which is the same as the number of free variables in the system after row reducing. The free variables are the columns without pivot positions.
ステップ 2
ステップ 2.1
Multiply each element of R1R1 by 1313 to make the entry at 1,11,1 a 11.
ステップ 2.1.1
Multiply each element of R1R1 by 1313 to make the entry at 1,11,1 a 11.
[335303750110]⎡⎢
⎢⎣335303750110⎤⎥
⎥⎦
ステップ 2.1.2
R1R1を簡約します。
[1530750110]⎡⎢
⎢⎣1530750110⎤⎥
⎥⎦
[1530750110]⎡⎢
⎢⎣1530750110⎤⎥
⎥⎦
ステップ 2.2
Perform the row operation R2=R2-7R1R2=R2−7R1 to make the entry at 2,12,1 a 00.
ステップ 2.2.1
Perform the row operation R2=R2-7R1R2=R2−7R1 to make the entry at 2,12,1 a 00.
[15307-7⋅15-7(53)0-7⋅0110]⎡⎢
⎢
⎢⎣15307−7⋅15−7(53)0−7⋅0110⎤⎥
⎥
⎥⎦
ステップ 2.2.2
R2R2を簡約します。
[15300-2030110]⎡⎢
⎢⎣15300−2030110⎤⎥
⎥⎦
[15300-2030110]⎡⎢
⎢⎣15300−2030110⎤⎥
⎥⎦
ステップ 2.3
Perform the row operation R3=R3-R1R3=R3−R1 to make the entry at 3,13,1 a 00.
ステップ 2.3.1
Perform the row operation R3=R3-R1R3=R3−R1 to make the entry at 3,13,1 a 00.
[15300-20301-11-530-0]⎡⎢
⎢
⎢⎣15300−20301−11−530−0⎤⎥
⎥
⎥⎦
ステップ 2.3.2
R3R3を簡約します。
[15300-20300-230]⎡⎢
⎢
⎢⎣15300−20300−230⎤⎥
⎥
⎥⎦
[15300-20300-230]⎡⎢
⎢
⎢⎣15300−20300−230⎤⎥
⎥
⎥⎦
ステップ 2.4
Multiply each element of R2R2 by -320−320 to make the entry at 2,22,2 a 11.
ステップ 2.4.1
Multiply each element of R2R2 by -320−320 to make the entry at 2,22,2 a 11.
[1530-320⋅0-320(-203)-320⋅00-230]⎡⎢
⎢
⎢
⎢⎣1530−320⋅0−320(−203)−320⋅00−230⎤⎥
⎥
⎥
⎥⎦
ステップ 2.4.2
R2R2を簡約します。
[15300100-230]⎡⎢
⎢⎣15300100−230⎤⎥
⎥⎦
[15300100-230]⎡⎢
⎢⎣15300100−230⎤⎥
⎥⎦
ステップ 2.5
Perform the row operation R3=R3+23R2R3=R3+23R2 to make the entry at 3,23,2 a 00.
ステップ 2.5.1
Perform the row operation R3=R3+23R2R3=R3+23R2 to make the entry at 3,23,2 a 00.
[15300100+23⋅0-23+23⋅10+23⋅0]⎡⎢
⎢⎣15300100+23⋅0−23+23⋅10+23⋅0⎤⎥
⎥⎦
ステップ 2.5.2
R3R3を簡約します。
[1530010000]⎡⎢
⎢⎣1530010000⎤⎥
⎥⎦
[1530010000]⎡⎢
⎢⎣1530010000⎤⎥
⎥⎦
ステップ 2.6
Perform the row operation R1=R1-53R2R1=R1−53R2 to make the entry at 1,21,2 a 00.
ステップ 2.6.1
Perform the row operation R1=R1-53R2R1=R1−53R2 to make the entry at 1,21,2 a 00.
[1-53⋅053-53⋅10-53⋅0010000]⎡⎢
⎢⎣1−53⋅053−53⋅10−53⋅0010000⎤⎥
⎥⎦
ステップ 2.6.2
R1R1を簡約します。
[100010000]⎡⎢⎣100010000⎤⎥⎦
[100010000]⎡⎢⎣100010000⎤⎥⎦
[100010000]⎡⎢⎣100010000⎤⎥⎦
ステップ 3
The pivot positions are the locations with the leading 11 in each row. The pivot columns are the columns that have a pivot position.
Pivot Positions: a11a11 and a22a22
Pivot Columns: 11 and 22
ステップ 4
The nullity is the number of columns without a pivot position in the row reduced matrix.
11