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    Hi everyone

    Just a quick question... do you (generally) think it's quicker to use Gauss Jordan Elimination or the cofactor method to find the inverse of a 3x3 matrix?

    (using pen and paper)
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    Personally, I'm quicker doing cofactors but I think for a 3x3 the difference is probably negligible.
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    I'd probably do Gaussian elimination even though it's slower — I don't trust myself to remember the cofactor formula!
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    (Original post by Zhen Lin)
    I'd probably do Gaussian elimination even though it's slower — I don't trust myself to remember the cofactor formula!
    I think they made us do it for A-level. (I can't see any other reason why I would have learnt it)
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    Can't wait to do the further pure units. This is FP3 isn't it?
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    I learned both at A-level but in the first semester of uni we've only been doing the gauss-jordan elimination. It allows you to write down the elementary matrices and elementary inverses as you do it. I find it faster tbh.
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    (Original post by MostCompetitive)
    Can't wait to do the further pure units. This is FP3 isn't it?
    Inverting matrices is not exciting.
 
 
 
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