Thread: how to multiply two arrays by hand.

  1. #1
    Registered User
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    Nov 2010

    how to multiply two arrays by hand.

    my problem is that a need an integer on 100 digit. and i have to get that by multiplying two arrays.
    But i want to know first how to multiply two arrays by hand, before I continue any further.

  2. #2
    Registered User
    Join Date
    Jun 2005
    Google "matrix multiplication" or "array multiplication".

    Strictly speaking, if you're trying to do some "large integer" type, the technique you want is probably discrete convolution (or polynomial multiplication). Mathematically, discrete convolution can be expressed as a particular form of matrix multiplication.
    Right 98% of the time, and don't care about the other 3%.

    If I seem grumpy or unhelpful in reply to you, or tell you you need to demonstrate more effort before you can expect help, it is likely you deserve it. Suck it up, Buttercup, and read this, this, and this before posting again.

  3. #3
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    Do you know how to multiply


    by hand?

    Two digits, or a hundred - the method is the same.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

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