Subtracting the last elements in each raw in two lists

up vote
6
down vote

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There are two lists:

list1 = {{1, 2, 4}, {1, 3, 5}, {2, 5, 7}};

list2 = {{1, 2, 7}, {1, 3, 3}, {2, 5, 6}};

How can we subtract the last number of each raw in list2 from list1 as

diff = {{1, 2, 3}, {1, 3, -2}, {2, 5, -1}}

edited Nov 22 at 17:43

kglr

174k8196401

asked Nov 22 at 13:57

monfneg

1336

add a comment |

up vote
6
down vote

favorite

There are two lists:

list1 = {{1, 2, 4}, {1, 3, 5}, {2, 5, 7}};

list2 = {{1, 2, 7}, {1, 3, 3}, {2, 5, 6}};

How can we subtract the last number of each raw in list2 from list1 as

diff = {{1, 2, 3}, {1, 3, -2}, {2, 5, -1}}

edited Nov 22 at 17:43

kglr

174k8196401

asked Nov 22 at 13:57

monfneg

1336

add a comment |

up vote
6
down vote

favorite

There are two lists:

list1 = {{1, 2, 4}, {1, 3, 5}, {2, 5, 7}};

list2 = {{1, 2, 7}, {1, 3, 3}, {2, 5, 6}};

How can we subtract the last number of each raw in list2 from list1 as

diff = {{1, 2, 3}, {1, 3, -2}, {2, 5, -1}}

edited Nov 22 at 17:43

kglr

174k8196401

asked Nov 22 at 13:57

monfneg

1336

There are two lists:

list1 = {{1, 2, 4}, {1, 3, 5}, {2, 5, 7}};

list2 = {{1, 2, 7}, {1, 3, 3}, {2, 5, 6}};

How can we subtract the last number of each raw in list2 from list1 as

diff = {{1, 2, 3}, {1, 3, -2}, {2, 5, -1}}

list-manipulation

edited Nov 22 at 17:43

kglr

174k8196401

asked Nov 22 at 13:57

monfneg

1336

edited Nov 22 at 17:43

kglr

174k8196401

asked Nov 22 at 13:57

monfneg

1336

edited Nov 22 at 17:43

kglr

174k8196401

edited Nov 22 at 17:43

kglr

174k8196401

edited Nov 22 at 17:43

kglr

174k8196401

asked Nov 22 at 13:57

monfneg

1336

asked Nov 22 at 13:57

monfneg

1336

asked Nov 22 at 13:57

monfneg

1336

add a comment |

3 Answers
3

active

oldest

votes

up vote
7
down vote

accepted

diff = list1;

diff[[All, -1]] = Subtract[list2[[All, -1]], list1[[All, -1]]];

diff

answered Nov 22 at 14:00

kglr

174k8196401

add a comment |

up vote
3
down vote

Another solution:

list1 // ReplacePart[ {i_, 3} :> Differences[ {list1, list2}, {1, 0} ][[ 1, i, 3]] ]

answered Nov 22 at 14:53

gwr

7,20122457

add a comment |

up vote
2
down vote

Try this:

Transpose[

 Append[Transpose[list1 ][[1 ;; 2]], 

  Last[Transpose[list2 ] - Transpose[list1 ]]]]



(*  {{1, 2, 3}, {1, 3, -2}, {2, 5, -1}}   *)

Have fun!

answered Nov 22 at 14:08

Alexei Boulbitch

21.1k2369

add a comment |

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3 Answers
3

active

oldest

votes

3 Answers
3

active

oldest

votes

up vote
7
down vote

accepted

diff = list1;

diff[[All, -1]] = Subtract[list2[[All, -1]], list1[[All, -1]]];

diff

answered Nov 22 at 14:00

kglr

174k8196401

add a comment |

up vote
7
down vote

accepted

diff = list1;

diff[[All, -1]] = Subtract[list2[[All, -1]], list1[[All, -1]]];

diff

answered Nov 22 at 14:00

kglr

174k8196401

add a comment |

up vote
7
down vote

accepted

diff = list1;

diff[[All, -1]] = Subtract[list2[[All, -1]], list1[[All, -1]]];

diff

answered Nov 22 at 14:00

kglr

174k8196401

diff = list1;

diff[[All, -1]] = Subtract[list2[[All, -1]], list1[[All, -1]]];

diff

answered Nov 22 at 14:00

kglr

174k8196401

answered Nov 22 at 14:00

kglr

174k8196401

answered Nov 22 at 14:00

kglr

174k8196401

answered Nov 22 at 14:00

kglr

174k8196401

add a comment |

up vote
3
down vote

Another solution:

list1 // ReplacePart[ {i_, 3} :> Differences[ {list1, list2}, {1, 0} ][[ 1, i, 3]] ]

answered Nov 22 at 14:53

gwr

7,20122457

add a comment |

up vote
3
down vote

Another solution:

list1 // ReplacePart[ {i_, 3} :> Differences[ {list1, list2}, {1, 0} ][[ 1, i, 3]] ]

answered Nov 22 at 14:53

gwr

7,20122457

add a comment |

up vote
3
down vote

Another solution:

list1 // ReplacePart[ {i_, 3} :> Differences[ {list1, list2}, {1, 0} ][[ 1, i, 3]] ]

answered Nov 22 at 14:53

gwr

7,20122457

Another solution:

list1 // ReplacePart[ {i_, 3} :> Differences[ {list1, list2}, {1, 0} ][[ 1, i, 3]] ]

answered Nov 22 at 14:53

gwr

7,20122457

answered Nov 22 at 14:53

gwr

7,20122457

answered Nov 22 at 14:53

gwr

7,20122457

answered Nov 22 at 14:53

gwr

7,20122457

add a comment |

up vote
2
down vote

Try this:

Transpose[

 Append[Transpose[list1 ][[1 ;; 2]], 

  Last[Transpose[list2 ] - Transpose[list1 ]]]]



(*  {{1, 2, 3}, {1, 3, -2}, {2, 5, -1}}   *)

Have fun!

answered Nov 22 at 14:08

Alexei Boulbitch

21.1k2369

add a comment |

up vote
2
down vote

Try this:

Transpose[

 Append[Transpose[list1 ][[1 ;; 2]], 

  Last[Transpose[list2 ] - Transpose[list1 ]]]]



(*  {{1, 2, 3}, {1, 3, -2}, {2, 5, -1}}   *)

Have fun!

answered Nov 22 at 14:08

Alexei Boulbitch

21.1k2369

add a comment |

up vote
2
down vote

Try this:

Transpose[

 Append[Transpose[list1 ][[1 ;; 2]], 

  Last[Transpose[list2 ] - Transpose[list1 ]]]]



(*  {{1, 2, 3}, {1, 3, -2}, {2, 5, -1}}   *)

Have fun!

answered Nov 22 at 14:08

Alexei Boulbitch

21.1k2369

Try this:

Transpose[

 Append[Transpose[list1 ][[1 ;; 2]], 

  Last[Transpose[list2 ] - Transpose[list1 ]]]]



(*  {{1, 2, 3}, {1, 3, -2}, {2, 5, -1}}   *)

Have fun!

answered Nov 22 at 14:08

Alexei Boulbitch

21.1k2369

answered Nov 22 at 14:08

Alexei Boulbitch

21.1k2369

answered Nov 22 at 14:08

Alexei Boulbitch

21.1k2369

answered Nov 22 at 14:08

Alexei Boulbitch

21.1k2369

add a comment |

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