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
asked Nov 13 '18 at 15:08
A. A.A. A.
18012
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
asked Nov 13 '18 at 15:08
A. A.A. A.
18012
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
asked Nov 13 '18 at 15:08
A. A.A. A.
18012
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
julia
asked Nov 13 '18 at 15:08
A. A.A. A.
18012
asked Nov 13 '18 at 15:08
A. A.A. A.
18012
asked Nov 13 '18 at 15:08
A. A.A. A.
18012
asked Nov 13 '18 at 15:08
A. A.A. A.
18012
asked Nov 13 '18 at 15:08
A. A.A. A.
18012
18012
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
active
oldest
votes
Use filter():
julia> filter(x -> x<0, -5:5)
5-element ArrayInt64,1:
-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 ArrayInt64,1:
1
2
3
4
5
You can use getindex() to get the actual values, e.g.:
julia> getindex(-5:5,indices)
5-element ArrayInt64,1:
-5
-4
-3
-2
-1
answered Nov 13 '18 at 15:21
Przemyslaw SzufelPrzemyslaw Szufel
2,109212
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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Use filter():
julia> filter(x -> x<0, -5:5)
5-element ArrayInt64,1:
-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 ArrayInt64,1:
1
2
3
4
5
You can use getindex() to get the actual values, e.g.:
julia> getindex(-5:5,indices)
5-element ArrayInt64,1:
-5
-4
-3
-2
-1
answered Nov 13 '18 at 15:21
Przemyslaw SzufelPrzemyslaw Szufel
2,109212
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 ArrayInt64,1:
-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 ArrayInt64,1:
1
2
3
4
5
You can use getindex() to get the actual values, e.g.:
julia> getindex(-5:5,indices)
5-element ArrayInt64,1:
-5
-4
-3
-2
-1
answered Nov 13 '18 at 15:21
Przemyslaw SzufelPrzemyslaw Szufel
2,109212
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 ArrayInt64,1:
-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 ArrayInt64,1:
1
2
3
4
5
You can use getindex() to get the actual values, e.g.:
julia> getindex(-5:5,indices)
5-element ArrayInt64,1:
-5
-4
-3
-2
-1
answered Nov 13 '18 at 15:21
Przemyslaw SzufelPrzemyslaw Szufel
2,109212
Use filter():
julia> filter(x -> x<0, -5:5)
5-element ArrayInt64,1:
-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 ArrayInt64,1:
1
2
3
4
5
You can use getindex() to get the actual values, e.g.:
julia> getindex(-5:5,indices)
5-element ArrayInt64,1:
-5
-4
-3
-2
-1
answered Nov 13 '18 at 15:21
Przemyslaw SzufelPrzemyslaw Szufel
2,109212
edited Nov 13 '18 at 15:45
answered Nov 13 '18 at 15:21
Przemyslaw SzufelPrzemyslaw Szufel
2,109212
answered Nov 13 '18 at 15:21
Przemyslaw SzufelPrzemyslaw Szufel
2,109212
answered Nov 13 '18 at 15:21
Przemyslaw SzufelPrzemyslaw Szufel
2,109212
2,109212
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