I want to make a matrix from 1D Arrays in Julia
0
I am new to Julia and need some help.
I have a list of 1D Arrays, I want to produce a matrix like this
g = [ 2.0 -1.0 0.0 0.0;
-1.0 2.0 -1.0 0.0;
0.0 -1.0 2.0 -1.0;
0.0 0.0 -1.0 3.0]
I am able to follow simple examples given on docs, but how do I achieve this using loops?
Cheers,
Ayush
julia
asked Nov 28 '18 at 5:18
Ayush PatnaikAyush Patnaik
1
add a comment |
0
I am new to Julia and need some help.
I have a list of 1D Arrays, I want to produce a matrix like this
g = [ 2.0 -1.0 0.0 0.0;
-1.0 2.0 -1.0 0.0;
0.0 -1.0 2.0 -1.0;
0.0 0.0 -1.0 3.0]
I am able to follow simple examples given on docs, but how do I achieve this using loops?
Cheers,
Ayush
julia
asked Nov 28 '18 at 5:18
Ayush PatnaikAyush Patnaik
1
2
Possible duplicate of How to convert Array{Array{Float64, 1}, 1} to Matrix in julia?
– Colin T Bowers
Nov 28 '18 at 5:58
add a comment |
0
0
0
I am new to Julia and need some help.
I have a list of 1D Arrays, I want to produce a matrix like this
g = [ 2.0 -1.0 0.0 0.0;
-1.0 2.0 -1.0 0.0;
0.0 -1.0 2.0 -1.0;
0.0 0.0 -1.0 3.0]
I am able to follow simple examples given on docs, but how do I achieve this using loops?
Cheers,
Ayush
julia
asked Nov 28 '18 at 5:18
Ayush PatnaikAyush Patnaik
1
I am new to Julia and need some help.
I have a list of 1D Arrays, I want to produce a matrix like this
g = [ 2.0 -1.0 0.0 0.0;
-1.0 2.0 -1.0 0.0;
0.0 -1.0 2.0 -1.0;
0.0 0.0 -1.0 3.0]
I am able to follow simple examples given on docs, but how do I achieve this using loops?
Cheers,
Ayush
julia
julia
asked Nov 28 '18 at 5:18
Ayush PatnaikAyush Patnaik
1
asked Nov 28 '18 at 5:18
Ayush PatnaikAyush Patnaik
1
asked Nov 28 '18 at 5:18
Ayush PatnaikAyush Patnaik
1
asked Nov 28 '18 at 5:18
Ayush PatnaikAyush Patnaik
1
asked Nov 28 '18 at 5:18
Ayush PatnaikAyush Patnaik
1
1
2
Possible duplicate of How to convert Array{Array{Float64, 1}, 1} to Matrix in julia?
– Colin T Bowers
Nov 28 '18 at 5:58
add a comment |
2
Possible duplicate of How to convert Array{Array{Float64, 1}, 1} to Matrix in julia?
– Colin T Bowers
Nov 28 '18 at 5:58
2
2
Possible duplicate of How to convert Array{Array{Float64, 1}, 1} to Matrix in julia?
– Colin T Bowers
Nov 28 '18 at 5:58
Possible duplicate of How to convert Array{Array{Float64, 1}, 1} to Matrix in julia?
– Colin T Bowers
Nov 28 '18 at 5:58
add a comment |
1 Answer
1
active
oldest
votes
1
with loops you can create a matrix and then fill it.
with loops
horizontally:
julia> arr = [[2.0,-1.0,0.0,0.0],[-1.0,2.0,-1.0,0.0],[0.0,-1.0,2.0,-1.0],[0.0,0.0,-1.0,3.0],[1.,1.,1.,1.]]
5-element Array{Array{Float64,1},1}:
[2.0, -1.0, 0.0, 0.0]
[-1.0, 2.0, -1.0, 0.0]
[0.0, -1.0, 2.0, -1.0]
[0.0, 0.0, -1.0, 3.0]
[1.0, 1.0, 1.0, 1.0]
julia> function make_matrix(input::Vector{<:Vector})
element_type = eltype(eltype(input))
if (length(input) == 0)
return Array{element_type,2}(undef,0,0)
end
height,width = length(input[1]), length(input)
for col in input
(height == length(col)) ? nothing : throw("inconsistent array size")
end
output = Array{element_type}(undef,height,width)
for i in 1:width
output[:,i] = input[i]
end
return output
end
make_matrix (generic function with 1 method)
julia> make_matrix(arr)
4×5 Array{Float64,2}:
2.0 -1.0 0.0 0.0 1.0
-1.0 2.0 -1.0 0.0 1.0
0.0 -1.0 2.0 -1.0 1.0
0.0 0.0 -1.0 3.0 1.0
vertically:
julia> function vmake_matrix(input::Vector{<:Vector})
element_type = eltype(eltype(input))
if (length(input) == 0)
return Array{element_type,2}(undef,0,0)
end
height,width = length(input),length(input[1])
for col in input
(width == length(col)) ? nothing : throw("inconsistent array size")
end
output = Array{element_type}(undef,height,width)
for i in 1:height
output[i,:] = input[i]
end
return output
end
vmake_matrix (generic function with 1 method)
julia> vmake_matrix(arr)
5×4 Array{Float64,2}:
2.0 -1.0 0.0 0.0
-1.0 2.0 -1.0 0.0
0.0 -1.0 2.0 -1.0
0.0 0.0 -1.0 3.0
1.0 1.0 1.0 1.0
without loops
without loops you can use vcat or hcat depending on the direction you want to concatenate the arrays in.
julia> H_arr = [ [ 2.0 -1.0 0.0 0.0],[-1.0 2.0 -1.0 0.0],[0.0 -1.0 2.0 -1.0],[0.0 0.0 -1.0 3.0] ]
4-element Array{Array{Float64,2},1}:
[2.0 -1.0 0.0 0.0]
[-1.0 2.0 -1.0 0.0]
[0.0 -1.0 2.0 -1.0]
[0.0 0.0 -1.0 3.0]
julia> vcat(H_arr...)
4×4 Array{Float64,2}:
2.0 -1.0 0.0 0.0
-1.0 2.0 -1.0 0.0
0.0 -1.0 2.0 -1.0
0.0 0.0 -1.0 3.0
julia> V_arr = [[2.0,-1.0,0.0,0.0],[-1.0,2.0,-1.0,0.0],[0.0,-1.0,2.0,-1.0],[0.0,0.0,-1.0,3.0]]
4-element Array{Array{Float64,1},1}:
[2.0, -1.0, 0.0, 0.0]
[-1.0, 2.0, -1.0, 0.0]
[0.0, -1.0, 2.0, -1.0]
[0.0, 0.0, -1.0, 3.0]
julia> hcat(V_arr...)
4×4 Array{Float64,2}:
2.0 -1.0 0.0 0.0
-1.0 2.0 -1.0 0.0
0.0 -1.0 2.0 -1.0
0.0 0.0 -1.0 3.0
answered Nov 28 '18 at 16:54
WarrenWarren
1486
add a comment |
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1 Answer
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1 Answer
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oldest
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oldest
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1
with loops you can create a matrix and then fill it.
with loops
horizontally:
julia> arr = [[2.0,-1.0,0.0,0.0],[-1.0,2.0,-1.0,0.0],[0.0,-1.0,2.0,-1.0],[0.0,0.0,-1.0,3.0],[1.,1.,1.,1.]]
5-element Array{Array{Float64,1},1}:
[2.0, -1.0, 0.0, 0.0]
[-1.0, 2.0, -1.0, 0.0]
[0.0, -1.0, 2.0, -1.0]
[0.0, 0.0, -1.0, 3.0]
[1.0, 1.0, 1.0, 1.0]
julia> function make_matrix(input::Vector{<:Vector})
element_type = eltype(eltype(input))
if (length(input) == 0)
return Array{element_type,2}(undef,0,0)
end
height,width = length(input[1]), length(input)
for col in input
(height == length(col)) ? nothing : throw("inconsistent array size")
end
output = Array{element_type}(undef,height,width)
for i in 1:width
output[:,i] = input[i]
end
return output
end
make_matrix (generic function with 1 method)
julia> make_matrix(arr)
4×5 Array{Float64,2}:
2.0 -1.0 0.0 0.0 1.0
-1.0 2.0 -1.0 0.0 1.0
0.0 -1.0 2.0 -1.0 1.0
0.0 0.0 -1.0 3.0 1.0
vertically:
julia> function vmake_matrix(input::Vector{<:Vector})
element_type = eltype(eltype(input))
if (length(input) == 0)
return Array{element_type,2}(undef,0,0)
end
height,width = length(input),length(input[1])
for col in input
(width == length(col)) ? nothing : throw("inconsistent array size")
end
output = Array{element_type}(undef,height,width)
for i in 1:height
output[i,:] = input[i]
end
return output
end
vmake_matrix (generic function with 1 method)
julia> vmake_matrix(arr)
5×4 Array{Float64,2}:
2.0 -1.0 0.0 0.0
-1.0 2.0 -1.0 0.0
0.0 -1.0 2.0 -1.0
0.0 0.0 -1.0 3.0
1.0 1.0 1.0 1.0
without loops
without loops you can use vcat or hcat depending on the direction you want to concatenate the arrays in.
julia> H_arr = [ [ 2.0 -1.0 0.0 0.0],[-1.0 2.0 -1.0 0.0],[0.0 -1.0 2.0 -1.0],[0.0 0.0 -1.0 3.0] ]
4-element Array{Array{Float64,2},1}:
[2.0 -1.0 0.0 0.0]
[-1.0 2.0 -1.0 0.0]
[0.0 -1.0 2.0 -1.0]
[0.0 0.0 -1.0 3.0]
julia> vcat(H_arr...)
4×4 Array{Float64,2}:
2.0 -1.0 0.0 0.0
-1.0 2.0 -1.0 0.0
0.0 -1.0 2.0 -1.0
0.0 0.0 -1.0 3.0
julia> V_arr = [[2.0,-1.0,0.0,0.0],[-1.0,2.0,-1.0,0.0],[0.0,-1.0,2.0,-1.0],[0.0,0.0,-1.0,3.0]]
4-element Array{Array{Float64,1},1}:
[2.0, -1.0, 0.0, 0.0]
[-1.0, 2.0, -1.0, 0.0]
[0.0, -1.0, 2.0, -1.0]
[0.0, 0.0, -1.0, 3.0]
julia> hcat(V_arr...)
4×4 Array{Float64,2}:
2.0 -1.0 0.0 0.0
-1.0 2.0 -1.0 0.0
0.0 -1.0 2.0 -1.0
0.0 0.0 -1.0 3.0
answered Nov 28 '18 at 16:54
WarrenWarren
1486
add a comment |
1
with loops you can create a matrix and then fill it.
with loops
horizontally:
julia> arr = [[2.0,-1.0,0.0,0.0],[-1.0,2.0,-1.0,0.0],[0.0,-1.0,2.0,-1.0],[0.0,0.0,-1.0,3.0],[1.,1.,1.,1.]]
5-element Array{Array{Float64,1},1}:
[2.0, -1.0, 0.0, 0.0]
[-1.0, 2.0, -1.0, 0.0]
[0.0, -1.0, 2.0, -1.0]
[0.0, 0.0, -1.0, 3.0]
[1.0, 1.0, 1.0, 1.0]
julia> function make_matrix(input::Vector{<:Vector})
element_type = eltype(eltype(input))
if (length(input) == 0)
return Array{element_type,2}(undef,0,0)
end
height,width = length(input[1]), length(input)
for col in input
(height == length(col)) ? nothing : throw("inconsistent array size")
end
output = Array{element_type}(undef,height,width)
for i in 1:width
output[:,i] = input[i]
end
return output
end
make_matrix (generic function with 1 method)
julia> make_matrix(arr)
4×5 Array{Float64,2}:
2.0 -1.0 0.0 0.0 1.0
-1.0 2.0 -1.0 0.0 1.0
0.0 -1.0 2.0 -1.0 1.0
0.0 0.0 -1.0 3.0 1.0
vertically:
julia> function vmake_matrix(input::Vector{<:Vector})
element_type = eltype(eltype(input))
if (length(input) == 0)
return Array{element_type,2}(undef,0,0)
end
height,width = length(input),length(input[1])
for col in input
(width == length(col)) ? nothing : throw("inconsistent array size")
end
output = Array{element_type}(undef,height,width)
for i in 1:height
output[i,:] = input[i]
end
return output
end
vmake_matrix (generic function with 1 method)
julia> vmake_matrix(arr)
5×4 Array{Float64,2}:
2.0 -1.0 0.0 0.0
-1.0 2.0 -1.0 0.0
0.0 -1.0 2.0 -1.0
0.0 0.0 -1.0 3.0
1.0 1.0 1.0 1.0
without loops
without loops you can use vcat or hcat depending on the direction you want to concatenate the arrays in.
julia> H_arr = [ [ 2.0 -1.0 0.0 0.0],[-1.0 2.0 -1.0 0.0],[0.0 -1.0 2.0 -1.0],[0.0 0.0 -1.0 3.0] ]
4-element Array{Array{Float64,2},1}:
[2.0 -1.0 0.0 0.0]
[-1.0 2.0 -1.0 0.0]
[0.0 -1.0 2.0 -1.0]
[0.0 0.0 -1.0 3.0]
julia> vcat(H_arr...)
4×4 Array{Float64,2}:
2.0 -1.0 0.0 0.0
-1.0 2.0 -1.0 0.0
0.0 -1.0 2.0 -1.0
0.0 0.0 -1.0 3.0
julia> V_arr = [[2.0,-1.0,0.0,0.0],[-1.0,2.0,-1.0,0.0],[0.0,-1.0,2.0,-1.0],[0.0,0.0,-1.0,3.0]]
4-element Array{Array{Float64,1},1}:
[2.0, -1.0, 0.0, 0.0]
[-1.0, 2.0, -1.0, 0.0]
[0.0, -1.0, 2.0, -1.0]
[0.0, 0.0, -1.0, 3.0]
julia> hcat(V_arr...)
4×4 Array{Float64,2}:
2.0 -1.0 0.0 0.0
-1.0 2.0 -1.0 0.0
0.0 -1.0 2.0 -1.0
0.0 0.0 -1.0 3.0
answered Nov 28 '18 at 16:54
WarrenWarren
1486
add a comment |
1
1
1
with loops you can create a matrix and then fill it.
with loops
horizontally:
julia> arr = [[2.0,-1.0,0.0,0.0],[-1.0,2.0,-1.0,0.0],[0.0,-1.0,2.0,-1.0],[0.0,0.0,-1.0,3.0],[1.,1.,1.,1.]]
5-element Array{Array{Float64,1},1}:
[2.0, -1.0, 0.0, 0.0]
[-1.0, 2.0, -1.0, 0.0]
[0.0, -1.0, 2.0, -1.0]
[0.0, 0.0, -1.0, 3.0]
[1.0, 1.0, 1.0, 1.0]
julia> function make_matrix(input::Vector{<:Vector})
element_type = eltype(eltype(input))
if (length(input) == 0)
return Array{element_type,2}(undef,0,0)
end
height,width = length(input[1]), length(input)
for col in input
(height == length(col)) ? nothing : throw("inconsistent array size")
end
output = Array{element_type}(undef,height,width)
for i in 1:width
output[:,i] = input[i]
end
return output
end
make_matrix (generic function with 1 method)
julia> make_matrix(arr)
4×5 Array{Float64,2}:
2.0 -1.0 0.0 0.0 1.0
-1.0 2.0 -1.0 0.0 1.0
0.0 -1.0 2.0 -1.0 1.0
0.0 0.0 -1.0 3.0 1.0
vertically:
julia> function vmake_matrix(input::Vector{<:Vector})
element_type = eltype(eltype(input))
if (length(input) == 0)
return Array{element_type,2}(undef,0,0)
end
height,width = length(input),length(input[1])
for col in input
(width == length(col)) ? nothing : throw("inconsistent array size")
end
output = Array{element_type}(undef,height,width)
for i in 1:height
output[i,:] = input[i]
end
return output
end
vmake_matrix (generic function with 1 method)
julia> vmake_matrix(arr)
5×4 Array{Float64,2}:
2.0 -1.0 0.0 0.0
-1.0 2.0 -1.0 0.0
0.0 -1.0 2.0 -1.0
0.0 0.0 -1.0 3.0
1.0 1.0 1.0 1.0
without loops
without loops you can use vcat or hcat depending on the direction you want to concatenate the arrays in.
julia> H_arr = [ [ 2.0 -1.0 0.0 0.0],[-1.0 2.0 -1.0 0.0],[0.0 -1.0 2.0 -1.0],[0.0 0.0 -1.0 3.0] ]
4-element Array{Array{Float64,2},1}:
[2.0 -1.0 0.0 0.0]
[-1.0 2.0 -1.0 0.0]
[0.0 -1.0 2.0 -1.0]
[0.0 0.0 -1.0 3.0]
julia> vcat(H_arr...)
4×4 Array{Float64,2}:
2.0 -1.0 0.0 0.0
-1.0 2.0 -1.0 0.0
0.0 -1.0 2.0 -1.0
0.0 0.0 -1.0 3.0
julia> V_arr = [[2.0,-1.0,0.0,0.0],[-1.0,2.0,-1.0,0.0],[0.0,-1.0,2.0,-1.0],[0.0,0.0,-1.0,3.0]]
4-element Array{Array{Float64,1},1}:
[2.0, -1.0, 0.0, 0.0]
[-1.0, 2.0, -1.0, 0.0]
[0.0, -1.0, 2.0, -1.0]
[0.0, 0.0, -1.0, 3.0]
julia> hcat(V_arr...)
4×4 Array{Float64,2}:
2.0 -1.0 0.0 0.0
-1.0 2.0 -1.0 0.0
0.0 -1.0 2.0 -1.0
0.0 0.0 -1.0 3.0
answered Nov 28 '18 at 16:54
WarrenWarren
1486
with loops you can create a matrix and then fill it.
with loops
horizontally:
julia> arr = [[2.0,-1.0,0.0,0.0],[-1.0,2.0,-1.0,0.0],[0.0,-1.0,2.0,-1.0],[0.0,0.0,-1.0,3.0],[1.,1.,1.,1.]]
5-element Array{Array{Float64,1},1}:
[2.0, -1.0, 0.0, 0.0]
[-1.0, 2.0, -1.0, 0.0]
[0.0, -1.0, 2.0, -1.0]
[0.0, 0.0, -1.0, 3.0]
[1.0, 1.0, 1.0, 1.0]
julia> function make_matrix(input::Vector{<:Vector})
element_type = eltype(eltype(input))
if (length(input) == 0)
return Array{element_type,2}(undef,0,0)
end
height,width = length(input[1]), length(input)
for col in input
(height == length(col)) ? nothing : throw("inconsistent array size")
end
output = Array{element_type}(undef,height,width)
for i in 1:width
output[:,i] = input[i]
end
return output
end
make_matrix (generic function with 1 method)
julia> make_matrix(arr)
4×5 Array{Float64,2}:
2.0 -1.0 0.0 0.0 1.0
-1.0 2.0 -1.0 0.0 1.0
0.0 -1.0 2.0 -1.0 1.0
0.0 0.0 -1.0 3.0 1.0
vertically:
julia> function vmake_matrix(input::Vector{<:Vector})
element_type = eltype(eltype(input))
if (length(input) == 0)
return Array{element_type,2}(undef,0,0)
end
height,width = length(input),length(input[1])
for col in input
(width == length(col)) ? nothing : throw("inconsistent array size")
end
output = Array{element_type}(undef,height,width)
for i in 1:height
output[i,:] = input[i]
end
return output
end
vmake_matrix (generic function with 1 method)
julia> vmake_matrix(arr)
5×4 Array{Float64,2}:
2.0 -1.0 0.0 0.0
-1.0 2.0 -1.0 0.0
0.0 -1.0 2.0 -1.0
0.0 0.0 -1.0 3.0
1.0 1.0 1.0 1.0
without loops
without loops you can use vcat or hcat depending on the direction you want to concatenate the arrays in.
julia> H_arr = [ [ 2.0 -1.0 0.0 0.0],[-1.0 2.0 -1.0 0.0],[0.0 -1.0 2.0 -1.0],[0.0 0.0 -1.0 3.0] ]
4-element Array{Array{Float64,2},1}:
[2.0 -1.0 0.0 0.0]
[-1.0 2.0 -1.0 0.0]
[0.0 -1.0 2.0 -1.0]
[0.0 0.0 -1.0 3.0]
julia> vcat(H_arr...)
4×4 Array{Float64,2}:
2.0 -1.0 0.0 0.0
-1.0 2.0 -1.0 0.0
0.0 -1.0 2.0 -1.0
0.0 0.0 -1.0 3.0
julia> V_arr = [[2.0,-1.0,0.0,0.0],[-1.0,2.0,-1.0,0.0],[0.0,-1.0,2.0,-1.0],[0.0,0.0,-1.0,3.0]]
4-element Array{Array{Float64,1},1}:
[2.0, -1.0, 0.0, 0.0]
[-1.0, 2.0, -1.0, 0.0]
[0.0, -1.0, 2.0, -1.0]
[0.0, 0.0, -1.0, 3.0]
julia> hcat(V_arr...)
4×4 Array{Float64,2}:
2.0 -1.0 0.0 0.0
-1.0 2.0 -1.0 0.0
0.0 -1.0 2.0 -1.0
0.0 0.0 -1.0 3.0
answered Nov 28 '18 at 16:54
WarrenWarren
1486
edited Nov 28 '18 at 17:26
answered Nov 28 '18 at 16:54
WarrenWarren
1486
answered Nov 28 '18 at 16:54
WarrenWarren
1486
answered Nov 28 '18 at 16:54
WarrenWarren
1486
1486
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Possible duplicate of How to convert Array{Array{Float64, 1}, 1} to Matrix in julia?
– Colin T Bowers
Nov 28 '18 at 5:58