Hi Phil, On 12/20/2010 10:49 PM, gutti wrote:
Hi all, In Matlab the following line of code: V3 = V1.*(V2>0) (V2>0) gives a Bool-Vector with ones (trues) and zero's where elements of V2 are> 0; Then this Bool vector is used to multiply all elements in V1 to zero where the condition V2>0 is not fulfilled. How can I do that in Haskell ? (I haven't seen bol operations or mapping functions into vectors, arrays in the HMatrix.pdf).
Vectorized boolean operations are not yet implemented but I hope to get them ready soon, including a "find" function. In the meantime you can use zipVectorWith, as mentioned by Henning.
We could also use signum, but this is not recommended (signum 0 is 0): import Numeric.LinearAlgebra vec = fromList :: [Double] -> Vector Double cond x = (signum (x-scalar eps) + 1 ) / 2 v1 = vec [10..20] v2 = vec [-5..5] v3 = v1 * cond v2 > v3 11 |> [0.0,0.0,0.0,0.0,0.0,0.0,16.0,17.0,18.0,19.0,20.0] -Alberto
. -- Many thanks in advance Phil
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