[英]F# vector rowvector multiplication issue
I need to multiply a Vector by a RowVector to get a Matrix as the result. 我需要将Vector乘以RowVector以获得矩阵作为结果。 But the F# libraries do not have such an implementation for the * operator.
但是F#库对*运算符没有这样的实现。 How can I do this?
我怎样才能做到这一点?
//wj(t+1)=wj(t) - a * (yk-dk)* xjk
let weightsDeltaRule (w : matrix, x : vector, y : vector, d : vector) (a : float) =
let delta = y - d
w - a * (Vector.transpose x) * delta
UPD: UPD:
vector<'T> * rowvec<'T> -> matrix<'T>
rowvec<'T> * vector<'T> -> 'T
Why do you think the powerpack doesn't implement Vector * RowVector = Matrix
? 您为什么认为
Vector * RowVector = Matrix
没有实现Vector * RowVector = Matrix
?
Taken from matrix.fsi
取自
matrix.fsi
/// Multiply a column vector and a row vector to produce a matrix
static member ( * ) : Vector<'T> * RowVector<'T> -> Matrix<'T>
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