F# Math.Net Matrix.mapRows to create new matrix with different size
I have a function that manipulates a Vector<float> resulting a new Vector<float> with different length, an example would be appending a number in front of the vector
let addElementInfront (x:Vector<float>) =
x.ToArray()
|> Array.append [|x.[0]|]
|> vector
Now I want to apply this to all the rows of a (2x2) matrix and I would expect a (2x3) matrix, I tried to use the Matrix.mapRows of MathNet.Numerics.LinearAlgebra but it gives me error that the size needs to be the same.
Just wonder if MathNet has any other function to map rows that results a different size matrix.
Thanks.
f# mathnet
asked Nov 14 '18 at 7:25
Jose VuJose Vu
788
add a comment |
I have a function that manipulates a Vector<float> resulting a new Vector<float> with different length, an example would be appending a number in front of the vector
let addElementInfront (x:Vector<float>) =
x.ToArray()
|> Array.append [|x.[0]|]
|> vector
Now I want to apply this to all the rows of a (2x2) matrix and I would expect a (2x3) matrix, I tried to use the Matrix.mapRows of MathNet.Numerics.LinearAlgebra but it gives me error that the size needs to be the same.
Just wonder if MathNet has any other function to map rows that results a different size matrix.
Thanks.
f# mathnet
asked Nov 14 '18 at 7:25
Jose VuJose Vu
788
add a comment |
I have a function that manipulates a Vector<float> resulting a new Vector<float> with different length, an example would be appending a number in front of the vector
let addElementInfront (x:Vector<float>) =
x.ToArray()
|> Array.append [|x.[0]|]
|> vector
Now I want to apply this to all the rows of a (2x2) matrix and I would expect a (2x3) matrix, I tried to use the Matrix.mapRows of MathNet.Numerics.LinearAlgebra but it gives me error that the size needs to be the same.
Just wonder if MathNet has any other function to map rows that results a different size matrix.
Thanks.
f# mathnet
asked Nov 14 '18 at 7:25
Jose VuJose Vu
788
I have a function that manipulates a Vector<float> resulting a new Vector<float> with different length, an example would be appending a number in front of the vector
let addElementInfront (x:Vector<float>) =
x.ToArray()
|> Array.append [|x.[0]|]
|> vector
Now I want to apply this to all the rows of a (2x2) matrix and I would expect a (2x3) matrix, I tried to use the Matrix.mapRows of MathNet.Numerics.LinearAlgebra but it gives me error that the size needs to be the same.
Just wonder if MathNet has any other function to map rows that results a different size matrix.
Thanks.
f# mathnet
f# mathnet
asked Nov 14 '18 at 7:25
Jose VuJose Vu
788
asked Nov 14 '18 at 7:25
Jose VuJose Vu
788
asked Nov 14 '18 at 7:25
Jose VuJose Vu
788
asked Nov 14 '18 at 7:25
Jose VuJose Vu
788
asked Nov 14 '18 at 7:25
Jose VuJose Vu
788
788
add a comment |
add a comment |
1 Answer
1
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oldest
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It seems you are trying to duplicate the first column of the matrix. For example:
1.0; 2.0 1.0; 1.0; 2.0
3.0; 4.0 becomes 3.0; 3.0; 4.0
If this is true, then the code could be:
let m = matrix [ [ 1.0; 2.0 ]
[ 3.0; 4.0 ] ]
m
|> Matrix.prependCol (m.Column 0)
UPDATE
Because the assumption above is not true.
So you can get the seq of the matrix rows, then transform it as usual with Seq.map, and finally make the result matrix:
let transform f m =
m
|> Matrix.toRowSeq
|> Seq.map f
|> matrix
// or even shorter in F# idiomatic style:
let transform f =
Matrix.toRowSeq >> Seq.map f >> matrix
// test
let addElementInFront (x : Vector<float>) =
x.ToArray()
|> Array.append [| x.[0] |]
|> vector
matrix [ [ 1.0; 2.0 ]
[ 3.0; 4.0 ] ]
|> transform addElementInFront
answered Nov 14 '18 at 8:51
Nghia BuiNghia Bui
1,463813
1
hi Nghia, thanks for your comment. The case I laid out is just an example that the function will transform the size of the vector, it needs not to be the exact. My question was to find the mapRows function that map this functionVector<float>->Vector<float>toMatrix<float>->Matrix<float>where the result matrix has different size than the original.
– Jose Vu
Nov 14 '18 at 9:10
1
Yes, edited my answer.
– Nghia Bui
Nov 14 '18 at 10:03
wow it works like a charm, i didn't know the toRowsSeq, also didn't know seq.map can apply on vector. Thanks bro, I marked your comment as the answer
– Jose Vu
Nov 14 '18 at 23:50
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
active
oldest
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oldest
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active
oldest
votes
It seems you are trying to duplicate the first column of the matrix. For example:
1.0; 2.0 1.0; 1.0; 2.0
3.0; 4.0 becomes 3.0; 3.0; 4.0
If this is true, then the code could be:
let m = matrix [ [ 1.0; 2.0 ]
[ 3.0; 4.0 ] ]
m
|> Matrix.prependCol (m.Column 0)
UPDATE
Because the assumption above is not true.
So you can get the seq of the matrix rows, then transform it as usual with Seq.map, and finally make the result matrix:
let transform f m =
m
|> Matrix.toRowSeq
|> Seq.map f
|> matrix
// or even shorter in F# idiomatic style:
let transform f =
Matrix.toRowSeq >> Seq.map f >> matrix
// test
let addElementInFront (x : Vector<float>) =
x.ToArray()
|> Array.append [| x.[0] |]
|> vector
matrix [ [ 1.0; 2.0 ]
[ 3.0; 4.0 ] ]
|> transform addElementInFront
answered Nov 14 '18 at 8:51
Nghia BuiNghia Bui
1,463813
1
hi Nghia, thanks for your comment. The case I laid out is just an example that the function will transform the size of the vector, it needs not to be the exact. My question was to find the mapRows function that map this functionVector<float>->Vector<float>toMatrix<float>->Matrix<float>where the result matrix has different size than the original.
– Jose Vu
Nov 14 '18 at 9:10
1
Yes, edited my answer.
– Nghia Bui
Nov 14 '18 at 10:03
wow it works like a charm, i didn't know the toRowsSeq, also didn't know seq.map can apply on vector. Thanks bro, I marked your comment as the answer
– Jose Vu
Nov 14 '18 at 23:50
add a comment |
It seems you are trying to duplicate the first column of the matrix. For example:
1.0; 2.0 1.0; 1.0; 2.0
3.0; 4.0 becomes 3.0; 3.0; 4.0
If this is true, then the code could be:
let m = matrix [ [ 1.0; 2.0 ]
[ 3.0; 4.0 ] ]
m
|> Matrix.prependCol (m.Column 0)
UPDATE
Because the assumption above is not true.
So you can get the seq of the matrix rows, then transform it as usual with Seq.map, and finally make the result matrix:
let transform f m =
m
|> Matrix.toRowSeq
|> Seq.map f
|> matrix
// or even shorter in F# idiomatic style:
let transform f =
Matrix.toRowSeq >> Seq.map f >> matrix
// test
let addElementInFront (x : Vector<float>) =
x.ToArray()
|> Array.append [| x.[0] |]
|> vector
matrix [ [ 1.0; 2.0 ]
[ 3.0; 4.0 ] ]
|> transform addElementInFront
answered Nov 14 '18 at 8:51
Nghia BuiNghia Bui
1,463813
1
hi Nghia, thanks for your comment. The case I laid out is just an example that the function will transform the size of the vector, it needs not to be the exact. My question was to find the mapRows function that map this functionVector<float>->Vector<float>toMatrix<float>->Matrix<float>where the result matrix has different size than the original.
– Jose Vu
Nov 14 '18 at 9:10
1
Yes, edited my answer.
– Nghia Bui
Nov 14 '18 at 10:03
wow it works like a charm, i didn't know the toRowsSeq, also didn't know seq.map can apply on vector. Thanks bro, I marked your comment as the answer
– Jose Vu
Nov 14 '18 at 23:50
add a comment |
It seems you are trying to duplicate the first column of the matrix. For example:
1.0; 2.0 1.0; 1.0; 2.0
3.0; 4.0 becomes 3.0; 3.0; 4.0
If this is true, then the code could be:
let m = matrix [ [ 1.0; 2.0 ]
[ 3.0; 4.0 ] ]
m
|> Matrix.prependCol (m.Column 0)
UPDATE
Because the assumption above is not true.
So you can get the seq of the matrix rows, then transform it as usual with Seq.map, and finally make the result matrix:
let transform f m =
m
|> Matrix.toRowSeq
|> Seq.map f
|> matrix
// or even shorter in F# idiomatic style:
let transform f =
Matrix.toRowSeq >> Seq.map f >> matrix
// test
let addElementInFront (x : Vector<float>) =
x.ToArray()
|> Array.append [| x.[0] |]
|> vector
matrix [ [ 1.0; 2.0 ]
[ 3.0; 4.0 ] ]
|> transform addElementInFront
answered Nov 14 '18 at 8:51
Nghia BuiNghia Bui
1,463813
It seems you are trying to duplicate the first column of the matrix. For example:
1.0; 2.0 1.0; 1.0; 2.0
3.0; 4.0 becomes 3.0; 3.0; 4.0
If this is true, then the code could be:
let m = matrix [ [ 1.0; 2.0 ]
[ 3.0; 4.0 ] ]
m
|> Matrix.prependCol (m.Column 0)
UPDATE
Because the assumption above is not true.
So you can get the seq of the matrix rows, then transform it as usual with Seq.map, and finally make the result matrix:
let transform f m =
m
|> Matrix.toRowSeq
|> Seq.map f
|> matrix
// or even shorter in F# idiomatic style:
let transform f =
Matrix.toRowSeq >> Seq.map f >> matrix
// test
let addElementInFront (x : Vector<float>) =
x.ToArray()
|> Array.append [| x.[0] |]
|> vector
matrix [ [ 1.0; 2.0 ]
[ 3.0; 4.0 ] ]
|> transform addElementInFront
answered Nov 14 '18 at 8:51
Nghia BuiNghia Bui
1,463813
edited Nov 15 '18 at 7:10
answered Nov 14 '18 at 8:51
Nghia BuiNghia Bui
1,463813
answered Nov 14 '18 at 8:51
Nghia BuiNghia Bui
1,463813
answered Nov 14 '18 at 8:51
Nghia BuiNghia Bui
1,463813
1,463813
1
hi Nghia, thanks for your comment. The case I laid out is just an example that the function will transform the size of the vector, it needs not to be the exact. My question was to find the mapRows function that map this functionVector<float>->Vector<float>toMatrix<float>->Matrix<float>where the result matrix has different size than the original.
– Jose Vu
Nov 14 '18 at 9:10
1
Yes, edited my answer.
– Nghia Bui
Nov 14 '18 at 10:03
wow it works like a charm, i didn't know the toRowsSeq, also didn't know seq.map can apply on vector. Thanks bro, I marked your comment as the answer
– Jose Vu
Nov 14 '18 at 23:50
add a comment |
1
hi Nghia, thanks for your comment. The case I laid out is just an example that the function will transform the size of the vector, it needs not to be the exact. My question was to find the mapRows function that map this functionVector<float>->Vector<float>toMatrix<float>->Matrix<float>where the result matrix has different size than the original.
– Jose Vu
Nov 14 '18 at 9:10
1
Yes, edited my answer.
– Nghia Bui
Nov 14 '18 at 10:03
wow it works like a charm, i didn't know the toRowsSeq, also didn't know seq.map can apply on vector. Thanks bro, I marked your comment as the answer
– Jose Vu
Nov 14 '18 at 23:50
1
1
hi Nghia, thanks for your comment. The case I laid out is just an example that the function will transform the size of the vector, it needs not to be the exact. My question was to find the mapRows function that map this function
Vector<float>->Vector<float> to Matrix<float>->Matrix<float> where the result matrix has different size than the original.– Jose Vu
Nov 14 '18 at 9:10
hi Nghia, thanks for your comment. The case I laid out is just an example that the function will transform the size of the vector, it needs not to be the exact. My question was to find the mapRows function that map this function
Vector<float>->Vector<float> to Matrix<float>->Matrix<float> where the result matrix has different size than the original.– Jose Vu
Nov 14 '18 at 9:10
1
1
Yes, edited my answer.
– Nghia Bui
Nov 14 '18 at 10:03
Yes, edited my answer.
– Nghia Bui
Nov 14 '18 at 10:03
wow it works like a charm, i didn't know the toRowsSeq, also didn't know seq.map can apply on vector. Thanks bro, I marked your comment as the answer
– Jose Vu
Nov 14 '18 at 23:50
wow it works like a charm, i didn't know the toRowsSeq, also didn't know seq.map can apply on vector. Thanks bro, I marked your comment as the answer
– Jose Vu
Nov 14 '18 at 23:50
add a comment |
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