Find function in Julia 1.0.2
I am transitioning to Julia 1.0.2 and I realized that the find function is not defined. In a previous version (Julia 0.6) I could write
find(x -> x<0, my_var)
In order to get the negative elements of the array called my_var. When I run the same code in Julia 1.0.2 I get the following error:
UndefVarError: find not defined
I couldn't find whether the find function is implemented under a different name or if it has been dropped. Is there any Julia 1.0.2 function that would be equivalent to the find function in previous Julia versions?
julia-lang
asked Nov 13 '18 at 15:08
A. A.A. A.
17512
add a comment |
I am transitioning to Julia 1.0.2 and I realized that the find function is not defined. In a previous version (Julia 0.6) I could write
find(x -> x<0, my_var)
In order to get the negative elements of the array called my_var. When I run the same code in Julia 1.0.2 I get the following error:
UndefVarError: find not defined
I couldn't find whether the find function is implemented under a different name or if it has been dropped. Is there any Julia 1.0.2 function that would be equivalent to the find function in previous Julia versions?
julia-lang
asked Nov 13 '18 at 15:08
A. A.A. A.
17512
1
Very strong recommendation: transition via v0.7. In this case, v0.7 would have given you a deprecation warning telling you to usefindallinstead offind. Note, v0.7 is exactly the same as v1.0, but with deprecation warnings for thousands of little gotchas like this one.
– Colin T Bowers
Nov 13 '18 at 23:12
add a comment |
I am transitioning to Julia 1.0.2 and I realized that the find function is not defined. In a previous version (Julia 0.6) I could write
find(x -> x<0, my_var)
In order to get the negative elements of the array called my_var. When I run the same code in Julia 1.0.2 I get the following error:
UndefVarError: find not defined
I couldn't find whether the find function is implemented under a different name or if it has been dropped. Is there any Julia 1.0.2 function that would be equivalent to the find function in previous Julia versions?
julia-lang
asked Nov 13 '18 at 15:08
A. A.A. A.
17512
I am transitioning to Julia 1.0.2 and I realized that the find function is not defined. In a previous version (Julia 0.6) I could write
find(x -> x<0, my_var)
In order to get the negative elements of the array called my_var. When I run the same code in Julia 1.0.2 I get the following error:
UndefVarError: find not defined
I couldn't find whether the find function is implemented under a different name or if it has been dropped. Is there any Julia 1.0.2 function that would be equivalent to the find function in previous Julia versions?
julia-lang
julia-lang
asked Nov 13 '18 at 15:08
A. A.A. A.
17512
asked Nov 13 '18 at 15:08
A. A.A. A.
17512
asked Nov 13 '18 at 15:08
A. A.A. A.
17512
asked Nov 13 '18 at 15:08
A. A.A. A.
17512
asked Nov 13 '18 at 15:08
A. A.A. A.
17512
17512
1
Very strong recommendation: transition via v0.7. In this case, v0.7 would have given you a deprecation warning telling you to usefindallinstead offind. Note, v0.7 is exactly the same as v1.0, but with deprecation warnings for thousands of little gotchas like this one.
– Colin T Bowers
Nov 13 '18 at 23:12
add a comment |
1
Very strong recommendation: transition via v0.7. In this case, v0.7 would have given you a deprecation warning telling you to usefindallinstead offind. Note, v0.7 is exactly the same as v1.0, but with deprecation warnings for thousands of little gotchas like this one.
– Colin T Bowers
Nov 13 '18 at 23:12
1
1
Very strong recommendation: transition via v0.7. In this case, v0.7 would have given you a deprecation warning telling you to use
findall instead of find. Note, v0.7 is exactly the same as v1.0, but with deprecation warnings for thousands of little gotchas like this one.– Colin T Bowers
Nov 13 '18 at 23:12
Very strong recommendation: transition via v0.7. In this case, v0.7 would have given you a deprecation warning telling you to use
findall instead of find. Note, v0.7 is exactly the same as v1.0, but with deprecation warnings for thousands of little gotchas like this one.– Colin T Bowers
Nov 13 '18 at 23:12
add a comment |
1 Answer
1
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oldest
votes
Use filter():
julia> filter(x -> x<0, -5:5)
5-element Array{Int64,1}:
-5
-4
-3
-2
-1
Another option is to use findall() to get the indices of elements:
julia> indices = findall(x -> x<0, -5:5)
5-element Array{Int64,1}:
1
2
3
4
5
You can use getindex() to get the actual values, e.g.:
julia> getindex(-5:5,indices)
5-element Array{Int64,1}:
-5
-4
-3
-2
-1
answered Nov 13 '18 at 15:21
Przemyslaw SzufelPrzemyslaw Szufel
1,729111
The last example can be also simply written as(-5:5)[indices]orgetindex(-5:5, indices)as broadcasting here is not needed.
– Bogumił Kamiński
Nov 13 '18 at 15:30
Thanks, that was exactly what I was looking for
– A. A.
Nov 13 '18 at 15:32
add a comment |
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1 Answer
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1 Answer
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Use filter():
julia> filter(x -> x<0, -5:5)
5-element Array{Int64,1}:
-5
-4
-3
-2
-1
Another option is to use findall() to get the indices of elements:
julia> indices = findall(x -> x<0, -5:5)
5-element Array{Int64,1}:
1
2
3
4
5
You can use getindex() to get the actual values, e.g.:
julia> getindex(-5:5,indices)
5-element Array{Int64,1}:
-5
-4
-3
-2
-1
answered Nov 13 '18 at 15:21
Przemyslaw SzufelPrzemyslaw Szufel
1,729111
The last example can be also simply written as(-5:5)[indices]orgetindex(-5:5, indices)as broadcasting here is not needed.
– Bogumił Kamiński
Nov 13 '18 at 15:30
Thanks, that was exactly what I was looking for
– A. A.
Nov 13 '18 at 15:32
add a comment |
Use filter():
julia> filter(x -> x<0, -5:5)
5-element Array{Int64,1}:
-5
-4
-3
-2
-1
Another option is to use findall() to get the indices of elements:
julia> indices = findall(x -> x<0, -5:5)
5-element Array{Int64,1}:
1
2
3
4
5
You can use getindex() to get the actual values, e.g.:
julia> getindex(-5:5,indices)
5-element Array{Int64,1}:
-5
-4
-3
-2
-1
answered Nov 13 '18 at 15:21
Przemyslaw SzufelPrzemyslaw Szufel
1,729111
The last example can be also simply written as(-5:5)[indices]orgetindex(-5:5, indices)as broadcasting here is not needed.
– Bogumił Kamiński
Nov 13 '18 at 15:30
Thanks, that was exactly what I was looking for
– A. A.
Nov 13 '18 at 15:32
add a comment |
Use filter():
julia> filter(x -> x<0, -5:5)
5-element Array{Int64,1}:
-5
-4
-3
-2
-1
Another option is to use findall() to get the indices of elements:
julia> indices = findall(x -> x<0, -5:5)
5-element Array{Int64,1}:
1
2
3
4
5
You can use getindex() to get the actual values, e.g.:
julia> getindex(-5:5,indices)
5-element Array{Int64,1}:
-5
-4
-3
-2
-1
answered Nov 13 '18 at 15:21
Przemyslaw SzufelPrzemyslaw Szufel
1,729111
Use filter():
julia> filter(x -> x<0, -5:5)
5-element Array{Int64,1}:
-5
-4
-3
-2
-1
Another option is to use findall() to get the indices of elements:
julia> indices = findall(x -> x<0, -5:5)
5-element Array{Int64,1}:
1
2
3
4
5
You can use getindex() to get the actual values, e.g.:
julia> getindex(-5:5,indices)
5-element Array{Int64,1}:
-5
-4
-3
-2
-1
answered Nov 13 '18 at 15:21
Przemyslaw SzufelPrzemyslaw Szufel
1,729111
edited Nov 13 '18 at 15:45
answered Nov 13 '18 at 15:21
Przemyslaw SzufelPrzemyslaw Szufel
1,729111
answered Nov 13 '18 at 15:21
Przemyslaw SzufelPrzemyslaw Szufel
1,729111
answered Nov 13 '18 at 15:21
Przemyslaw SzufelPrzemyslaw Szufel
1,729111
1,729111
The last example can be also simply written as(-5:5)[indices]orgetindex(-5:5, indices)as broadcasting here is not needed.
– Bogumił Kamiński
Nov 13 '18 at 15:30
Thanks, that was exactly what I was looking for
– A. A.
Nov 13 '18 at 15:32
add a comment |
The last example can be also simply written as(-5:5)[indices]orgetindex(-5:5, indices)as broadcasting here is not needed.
– Bogumił Kamiński
Nov 13 '18 at 15:30
Thanks, that was exactly what I was looking for
– A. A.
Nov 13 '18 at 15:32
The last example can be also simply written as
(-5:5)[indices] or getindex(-5:5, indices) as broadcasting here is not needed.– Bogumił Kamiński
Nov 13 '18 at 15:30
The last example can be also simply written as
(-5:5)[indices] or getindex(-5:5, indices) as broadcasting here is not needed.– Bogumił Kamiński
Nov 13 '18 at 15:30
Thanks, that was exactly what I was looking for
– A. A.
Nov 13 '18 at 15:32
Thanks, that was exactly what I was looking for
– A. A.
Nov 13 '18 at 15:32
add a comment |
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1
Very strong recommendation: transition via v0.7. In this case, v0.7 would have given you a deprecation warning telling you to use
findallinstead offind. Note, v0.7 is exactly the same as v1.0, but with deprecation warnings for thousands of little gotchas like this one.– Colin T Bowers
Nov 13 '18 at 23:12