Replacing the Zeros of One List by the (i-1)th Element of Another List
Clash Royale CLAN TAG#URR8PPP
$begingroup$
My goal is to replace the zeros of one list with the (i-1)th element of a second list. For example, if
list1 = 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0
and
list2 = 6, 1, 4, 7, 2, 9, 10, 8, 11, 3, 5, 0, 12
the desired output is 0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0. Note that the first element of the output is defined as 0 still.
My attempt to create a code for this is to first find the zeros of list1
then run a for-loop for $i in$zeroslist1
.
zeroslist1 = Flatten[Position[list1, 0]]
DeleteCases[
Flatten[Reap@
Do[Sow[ReplacePart[vtest1,
i -> vtest2[[i - 1]] & /@ zeroslist1]], i, zeroslist1], 2], Null]
The results of the output are:
List,1,1,0,0,1,1,0,1,0,0,1,0, 0,1,1,4,0,1,1,0,1,0,0,1,0, 0,1,1,0,7,1,1,0,1,0,0,1,0,0,1,1,0,0,1,1,10,1,0,0,1,0, 0,1,1,0,0,1,1,0,1,11,0,1,0,0,1,1,0,0,1,1,0,1,0,3,1,0, 0,1,1,0,0,1,1,0,1,0,0,1,0.
Either a cleaner way to code the desire output or a method of merging the output of my current for-loop to get the desired output would be great.
list-manipulation functions function-construction
$endgroup$
add a comment |
$begingroup$
My goal is to replace the zeros of one list with the (i-1)th element of a second list. For example, if
list1 = 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0
and
list2 = 6, 1, 4, 7, 2, 9, 10, 8, 11, 3, 5, 0, 12
the desired output is 0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0. Note that the first element of the output is defined as 0 still.
My attempt to create a code for this is to first find the zeros of list1
then run a for-loop for $i in$zeroslist1
.
zeroslist1 = Flatten[Position[list1, 0]]
DeleteCases[
Flatten[Reap@
Do[Sow[ReplacePart[vtest1,
i -> vtest2[[i - 1]] & /@ zeroslist1]], i, zeroslist1], 2], Null]
The results of the output are:
List,1,1,0,0,1,1,0,1,0,0,1,0, 0,1,1,4,0,1,1,0,1,0,0,1,0, 0,1,1,0,7,1,1,0,1,0,0,1,0,0,1,1,0,0,1,1,10,1,0,0,1,0, 0,1,1,0,0,1,1,0,1,11,0,1,0,0,1,1,0,0,1,1,0,1,0,3,1,0, 0,1,1,0,0,1,1,0,1,0,0,1,0.
Either a cleaner way to code the desire output or a method of merging the output of my current for-loop to get the desired output would be great.
list-manipulation functions function-construction
$endgroup$
add a comment |
$begingroup$
My goal is to replace the zeros of one list with the (i-1)th element of a second list. For example, if
list1 = 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0
and
list2 = 6, 1, 4, 7, 2, 9, 10, 8, 11, 3, 5, 0, 12
the desired output is 0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0. Note that the first element of the output is defined as 0 still.
My attempt to create a code for this is to first find the zeros of list1
then run a for-loop for $i in$zeroslist1
.
zeroslist1 = Flatten[Position[list1, 0]]
DeleteCases[
Flatten[Reap@
Do[Sow[ReplacePart[vtest1,
i -> vtest2[[i - 1]] & /@ zeroslist1]], i, zeroslist1], 2], Null]
The results of the output are:
List,1,1,0,0,1,1,0,1,0,0,1,0, 0,1,1,4,0,1,1,0,1,0,0,1,0, 0,1,1,0,7,1,1,0,1,0,0,1,0,0,1,1,0,0,1,1,10,1,0,0,1,0, 0,1,1,0,0,1,1,0,1,11,0,1,0,0,1,1,0,0,1,1,0,1,0,3,1,0, 0,1,1,0,0,1,1,0,1,0,0,1,0.
Either a cleaner way to code the desire output or a method of merging the output of my current for-loop to get the desired output would be great.
list-manipulation functions function-construction
$endgroup$
My goal is to replace the zeros of one list with the (i-1)th element of a second list. For example, if
list1 = 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0
and
list2 = 6, 1, 4, 7, 2, 9, 10, 8, 11, 3, 5, 0, 12
the desired output is 0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0. Note that the first element of the output is defined as 0 still.
My attempt to create a code for this is to first find the zeros of list1
then run a for-loop for $i in$zeroslist1
.
zeroslist1 = Flatten[Position[list1, 0]]
DeleteCases[
Flatten[Reap@
Do[Sow[ReplacePart[vtest1,
i -> vtest2[[i - 1]] & /@ zeroslist1]], i, zeroslist1], 2], Null]
The results of the output are:
List,1,1,0,0,1,1,0,1,0,0,1,0, 0,1,1,4,0,1,1,0,1,0,0,1,0, 0,1,1,0,7,1,1,0,1,0,0,1,0,0,1,1,0,0,1,1,10,1,0,0,1,0, 0,1,1,0,0,1,1,0,1,11,0,1,0,0,1,1,0,0,1,1,0,1,0,3,1,0, 0,1,1,0,0,1,1,0,1,0,0,1,0.
Either a cleaner way to code the desire output or a method of merging the output of my current for-loop to get the desired output would be great.
list-manipulation functions function-construction
list-manipulation functions function-construction
asked Feb 11 at 17:03
WillWill
3348
3348
add a comment |
add a comment |
5 Answers
5
active
oldest
votes
$begingroup$
You can use a multiplication instead of looping or conditionals:
list1 + (1 - list1) Prepend[Most[list2], 0]
0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0
The central point is that 0 and 1 in list1
aren't just symbols but numeric quantities.
$endgroup$
$begingroup$
What a simple way to do this. Thank you so much.
$endgroup$
– Will
Feb 11 at 17:51
add a comment |
$begingroup$
idx = Random`Private`PositionsOf[Rest[list1], 0];
result = list1;
result[[idx + 1]] = list2[[idx]];
result
0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0
$endgroup$
add a comment |
$begingroup$
Here's another possibility:
Module[tmp=list1,
With[i = Pick[Range[Length[list1]-1], Rest @ list1, 0],
tmp[[i+1]]=list2[[i]]
];
tmp
]
0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0
$endgroup$
add a comment |
$begingroup$
Also MapIndexed
works fine
(# /. List -> 0) & /@ MapIndexed[Replace[#1, 0 -> list2[[#2[[1]] - 1]]] &, list1]
The first piece just replaces the special case when a zero element is in the first entry (in Mathematica the 0th element is the Head
, which in this case is List
). Then the function MapIndexed
does its job.
$endgroup$
add a comment |
$begingroup$
MapThread[If[#1 == 0, #2, #1] &, Join[list1, 0], Join[0, list2]] // Most
0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0
Your answer from above
0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0
$endgroup$
add a comment |
Your Answer
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5 Answers
5
active
oldest
votes
5 Answers
5
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
You can use a multiplication instead of looping or conditionals:
list1 + (1 - list1) Prepend[Most[list2], 0]
0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0
The central point is that 0 and 1 in list1
aren't just symbols but numeric quantities.
$endgroup$
$begingroup$
What a simple way to do this. Thank you so much.
$endgroup$
– Will
Feb 11 at 17:51
add a comment |
$begingroup$
You can use a multiplication instead of looping or conditionals:
list1 + (1 - list1) Prepend[Most[list2], 0]
0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0
The central point is that 0 and 1 in list1
aren't just symbols but numeric quantities.
$endgroup$
$begingroup$
What a simple way to do this. Thank you so much.
$endgroup$
– Will
Feb 11 at 17:51
add a comment |
$begingroup$
You can use a multiplication instead of looping or conditionals:
list1 + (1 - list1) Prepend[Most[list2], 0]
0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0
The central point is that 0 and 1 in list1
aren't just symbols but numeric quantities.
$endgroup$
You can use a multiplication instead of looping or conditionals:
list1 + (1 - list1) Prepend[Most[list2], 0]
0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0
The central point is that 0 and 1 in list1
aren't just symbols but numeric quantities.
edited Feb 11 at 17:59
answered Feb 11 at 17:32
RomanRoman
2,624717
2,624717
$begingroup$
What a simple way to do this. Thank you so much.
$endgroup$
– Will
Feb 11 at 17:51
add a comment |
$begingroup$
What a simple way to do this. Thank you so much.
$endgroup$
– Will
Feb 11 at 17:51
$begingroup$
What a simple way to do this. Thank you so much.
$endgroup$
– Will
Feb 11 at 17:51
$begingroup$
What a simple way to do this. Thank you so much.
$endgroup$
– Will
Feb 11 at 17:51
add a comment |
$begingroup$
idx = Random`Private`PositionsOf[Rest[list1], 0];
result = list1;
result[[idx + 1]] = list2[[idx]];
result
0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0
$endgroup$
add a comment |
$begingroup$
idx = Random`Private`PositionsOf[Rest[list1], 0];
result = list1;
result[[idx + 1]] = list2[[idx]];
result
0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0
$endgroup$
add a comment |
$begingroup$
idx = Random`Private`PositionsOf[Rest[list1], 0];
result = list1;
result[[idx + 1]] = list2[[idx]];
result
0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0
$endgroup$
idx = Random`Private`PositionsOf[Rest[list1], 0];
result = list1;
result[[idx + 1]] = list2[[idx]];
result
0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0
answered Feb 11 at 17:12
Henrik SchumacherHenrik Schumacher
55.5k576154
55.5k576154
add a comment |
add a comment |
$begingroup$
Here's another possibility:
Module[tmp=list1,
With[i = Pick[Range[Length[list1]-1], Rest @ list1, 0],
tmp[[i+1]]=list2[[i]]
];
tmp
]
0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0
$endgroup$
add a comment |
$begingroup$
Here's another possibility:
Module[tmp=list1,
With[i = Pick[Range[Length[list1]-1], Rest @ list1, 0],
tmp[[i+1]]=list2[[i]]
];
tmp
]
0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0
$endgroup$
add a comment |
$begingroup$
Here's another possibility:
Module[tmp=list1,
With[i = Pick[Range[Length[list1]-1], Rest @ list1, 0],
tmp[[i+1]]=list2[[i]]
];
tmp
]
0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0
$endgroup$
Here's another possibility:
Module[tmp=list1,
With[i = Pick[Range[Length[list1]-1], Rest @ list1, 0],
tmp[[i+1]]=list2[[i]]
];
tmp
]
0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0
answered Feb 11 at 17:13
Carl WollCarl Woll
69.3k393179
69.3k393179
add a comment |
add a comment |
$begingroup$
Also MapIndexed
works fine
(# /. List -> 0) & /@ MapIndexed[Replace[#1, 0 -> list2[[#2[[1]] - 1]]] &, list1]
The first piece just replaces the special case when a zero element is in the first entry (in Mathematica the 0th element is the Head
, which in this case is List
). Then the function MapIndexed
does its job.
$endgroup$
add a comment |
$begingroup$
Also MapIndexed
works fine
(# /. List -> 0) & /@ MapIndexed[Replace[#1, 0 -> list2[[#2[[1]] - 1]]] &, list1]
The first piece just replaces the special case when a zero element is in the first entry (in Mathematica the 0th element is the Head
, which in this case is List
). Then the function MapIndexed
does its job.
$endgroup$
add a comment |
$begingroup$
Also MapIndexed
works fine
(# /. List -> 0) & /@ MapIndexed[Replace[#1, 0 -> list2[[#2[[1]] - 1]]] &, list1]
The first piece just replaces the special case when a zero element is in the first entry (in Mathematica the 0th element is the Head
, which in this case is List
). Then the function MapIndexed
does its job.
$endgroup$
Also MapIndexed
works fine
(# /. List -> 0) & /@ MapIndexed[Replace[#1, 0 -> list2[[#2[[1]] - 1]]] &, list1]
The first piece just replaces the special case when a zero element is in the first entry (in Mathematica the 0th element is the Head
, which in this case is List
). Then the function MapIndexed
does its job.
answered Feb 11 at 17:16
Mane.andreaMane.andrea
1816
1816
add a comment |
add a comment |
$begingroup$
MapThread[If[#1 == 0, #2, #1] &, Join[list1, 0], Join[0, list2]] // Most
0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0
Your answer from above
0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0
$endgroup$
add a comment |
$begingroup$
MapThread[If[#1 == 0, #2, #1] &, Join[list1, 0], Join[0, list2]] // Most
0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0
Your answer from above
0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0
$endgroup$
add a comment |
$begingroup$
MapThread[If[#1 == 0, #2, #1] &, Join[list1, 0], Join[0, list2]] // Most
0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0
Your answer from above
0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0
$endgroup$
MapThread[If[#1 == 0, #2, #1] &, Join[list1, 0], Join[0, list2]] // Most
0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0
Your answer from above
0, 1, 1, 4, 7, 1, 1, 10, 1, 11, 3, 1, 0
answered Feb 11 at 17:12
MikeYMikeY
3,258614
3,258614
add a comment |
add a comment |
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