[Haskell-cafe] hmatrix

[Thomas Hartman]

what package do you install/import to get at Vector?

2008/5/31 Thomas Hartman <tphyahoo at gmail.com>:
> what package do you install/import to get at Vector?
>
> 2008/5/31 Anatoly Yakovenko <aeyakovenko at gmail.com>:
>> What is the most efficient way to update a position in a matrix or a
>> vector?  I came up with this:
>>
>> updateVector :: Vector Double -> Int -> Double -> Vector Double
>> updateVector vec pos val = vec `add` v2
>>   where
>>      v2 = fromList $ (replicate (pos) 0.0) ++ ((val - (vec @>
>> pos)):(replicate ((dim vec)- pos - 1) 0.0))
>>
>> but this seems pretty inefficient to me.
>>
>> thanks,
>> Anatoly
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>