Matematica discreta Esempi

$[\begin{array}{c} 2 & 1 & 1 & 0 \\ 4 & 3 & 0 & 1 \end{array}]$

Passaggio 1

Trova la forma ridotta a scala per righe di Echelon.

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Passaggio 1.1

Multiply each element of $R_{1}$ by $\frac{1}{2}$ to make the entry at $1, 1$ a $1$ .

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Passaggio 1.1.1

Multiply each element of $R_{1}$ by $\frac{1}{2}$ to make the entry at $1, 1$ a $1$ .

$[\begin{array}{c} \frac{2}{2} & \frac{1}{2} & \frac{1}{2} & \frac{0}{2} \\ 4 & 3 & 0 & 1 \end{array}]$

Passaggio 1.1.2

Semplifica $R_{1}$ .

$[\begin{array}{c} 1 & \frac{1}{2} & \frac{1}{2} & 0 \\ 4 & 3 & 0 & 1 \end{array}]$

Passaggio 1.2

Perform the row operation $R_{2} = R_{2} - 4 R_{1}$ to make the entry at $2, 1$ a $0$ .

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Passaggio 1.2.1

Perform the row operation $R_{2} = R_{2} - 4 R_{1}$ to make the entry at $2, 1$ a $0$ .

$[\begin{array}{c} 1 & \frac{1}{2} & \frac{1}{2} & 0 \\ 4 - 4 \cdot 1 & 3 - 4 (\frac{1}{2}) & 0 - 4 (\frac{1}{2}) & 1 - 4 \cdot 0 \end{array}]$

Passaggio 1.2.2

Semplifica $R_{2}$ .

$[\begin{array}{c} 1 & \frac{1}{2} & \frac{1}{2} & 0 \\ 0 & 1 & - 2 & 1 \end{array}]$

Passaggio 1.3

Perform the row operation $R_{1} = R_{1} - \frac{1}{2} R_{2}$ to make the entry at $1, 2$ a $0$ .

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Passaggio 1.3.1

Perform the row operation $R_{1} = R_{1} - \frac{1}{2} R_{2}$ to make the entry at $1, 2$ a $0$ .

$[\begin{array}{c} 1 - \frac{1}{2} \cdot 0 & \frac{1}{2} - \frac{1}{2} \cdot 1 & \frac{1}{2} - \frac{1}{2} \cdot - 2 & 0 - \frac{1}{2} \cdot 1 \\ 0 & 1 & - 2 & 1 \end{array}]$

Passaggio 1.3.2

Semplifica $R_{1}$ .

$[\begin{array}{c} 1 & 0 & \frac{3}{2} & - \frac{1}{2} \\ 0 & 1 & - 2 & 1 \end{array}]$

Passaggio 2

The pivot positions are the locations with the leading $1$ in each row. The pivot columns are the columns that have a pivot position.

Pivot Positions: $a_{11}$ and $a_{22}$

Pivot Columns: $1$ and $2$