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anonymous

  • 5 years ago

when working with matrices, and performing row operations, how to i determine which equations to keep the same

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  1. amistre64
    • 5 years ago
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    it depends on what your trying to accomlish

  2. amistre64
    • 5 years ago
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    you usually want to get it into the form of an identity matris 100 010 001

  3. anonymous
    • 5 years ago
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    like if i am trying to get into ro-ecelon form. Sometimes in my book they say add 2*row three to row 2, producing a new row 2

  4. anonymous
    • 5 years ago
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    but why is it that we dont also get a new row 3

  5. amistre64
    • 5 years ago
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    row echelon is just zeroing out the under on the pivots right?

  6. anonymous
    • 5 years ago
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    right

  7. amistre64
    • 5 years ago
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    the idea is to modify one row thru addition by using a useful form of the pivoting row; the pivoting row is already set so it doesnt need changed does it? in this case that would have been row 2

  8. anonymous
    • 5 years ago
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    so in the case i mentioned above the row 2 is not changed because its the pivoting row, meaning we are adding it to row 3

  9. anonymous
    • 5 years ago
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    thus producing a new row three, but keeping the original row 2

  10. amistre64
    • 5 years ago
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    correct; changing row 2 at some later point is fiine; but for your problem its not needed to change

  11. anonymous
    • 5 years ago
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    alright, thanks

  12. amistre64
    • 5 years ago
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    youre welcome :)

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