How to drop certain elements in certain positions from a list using drop function

The name of the pictureThe name of the pictureThe name of the pictureClash Royale CLAN TAG#URR8PPP

up vote
3
down vote

favorite

a = Table[i, {i, 1, 10}]
Drop[a, {5, 8}]

If go with the above procedure, It will delete all the elements from between position 5 to 8. How to drop elements which are a position 5 and position 8 using drop function.

share|improve this question

    up vote
    3
    down vote

    favorite

    a = Table[i, {i, 1, 10}]
    Drop[a, {5, 8}]
    

    If go with the above procedure, It will delete all the elements from between position 5 to 8. How to drop elements which are a position 5 and position 8 using drop function.

    share|improve this question

      up vote
      3
      down vote

      favorite

      up vote
      3
      down vote

      favorite

      a = Table[i, {i, 1, 10}]
      Drop[a, {5, 8}]
      

      If go with the above procedure, It will delete all the elements from between position 5 to 8. How to drop elements which are a position 5 and position 8 using drop function.

      share|improve this question

      a = Table[i, {i, 1, 10}]
      Drop[a, {5, 8}]
      

      If go with the above procedure, It will delete all the elements from between position 5 to 8. How to drop elements which are a position 5 and position 8 using drop function.

      list-manipulation matrix

      share|improve this question

      share|improve this question

      share|improve this question

      share|improve this question

      asked Nov 29 at 7:22

      acoustics

      32118

      32118

          2 Answers
          2

          active

          oldest

          votes

          up vote
          5
          down vote

          accepted

          Use instead Delete, in this way:

          a = Table[i, {i, 1, 10}];
          Delete[a, {{5}, {8}}]
          

          (*

          {1, 2, 3, 4, 6, 7, 9, 10}

          *)

          By the way, you can be far more efficient:

          a = Range[10]
          

          share|improve this answer

          • can we give the list of position which I wanted to drop like {3,5,8,9}
            – acoustics
            Nov 29 at 7:49

          • 2

            Delete[a,{{3},{5},{8},{9}}]
            – David G. Stork
            Nov 29 at 7:50

          • 1

            Also Delete[a, Partition[{3, 5, 8, 9}, 1]] comes to mind… if the list of positions gets longer.
            – Henrik Schumacher
            Nov 29 at 8:04

          up vote
          3
          down vote

          Drop[a, {5, 8, 3}]
          

          {1, 2, 3, 4, 6, 7, 9, 10}

          Fold[Drop[#, {#2}] &, a, Reverse[{5, 8}]]
          

          {1, 2, 3, 4, 6, 7, 9, 10}

          share|improve this answer

            Your Answer

            StackExchange.ifUsing(“editor”, function () {
            return StackExchange.using(“mathjaxEditing”, function () {
            StackExchange.MarkdownEditor.creationCallbacks.add(function (editor, postfix) {
            StackExchange.mathjaxEditing.prepareWmdForMathJax(editor, postfix, [[“$”, “$”], [“\\(“,”\\)”]]);
            });
            });
            }, “mathjax-editing”);

            StackExchange.ready(function() {
            var channelOptions = {
            tags: “”.split(” “),
            id: “387”
            };
            initTagRenderer(“”.split(” “), “”.split(” “), channelOptions);

            StackExchange.using(“externalEditor”, function() {
            // Have to fire editor after snippets, if snippets enabled
            if (StackExchange.settings.snippets.snippetsEnabled) {
            StackExchange.using(“snippets”, function() {
            createEditor();
            });
            }
            else {
            createEditor();
            }
            });

            function createEditor() {
            StackExchange.prepareEditor({
            heartbeatType: ‘answer’,
            convertImagesToLinks: false,
            noModals: true,
            showLowRepImageUploadWarning: true,
            reputationToPostImages: null,
            bindNavPrevention: true,
            postfix: “”,
            imageUploader: {
            brandingHtml: “Powered by u003ca class=”icon-imgur-white” href=”https://imgur.com/”u003eu003c/au003e”,
            contentPolicyHtml: “User contributions licensed under u003ca href=”https://creativecommons.org/licenses/by-sa/3.0/”u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href=”https://stackoverflow.com/legal/content-policy”u003e(content policy)u003c/au003e”,
            allowUrls: true
            },
            onDemand: true,
            discardSelector: “.discard-answer”
            ,immediatelyShowMarkdownHelp:true
            });

            }
            });

            draft saved
            draft discarded

            StackExchange.ready(
            function () {
            StackExchange.openid.initPostLogin(‘.new-post-login’, ‘https%3a%2f%2fmathematica.stackexchange.com%2fquestions%2f186943%2fhow-to-drop-certain-elements-in-certain-positions-from-a-list-using-drop-functio%23new-answer’, ‘question_page’);
            }
            );

            Post as a guest

            Required, but never shown

            2 Answers
            2

            active

            oldest

            votes

            2 Answers
            2

            active

            oldest

            votes

            active

            oldest

            votes

            active

            oldest

            votes

            up vote
            5
            down vote

            accepted

            Use instead Delete, in this way:

            a = Table[i, {i, 1, 10}];
            Delete[a, {{5}, {8}}]
            

            (*

            {1, 2, 3, 4, 6, 7, 9, 10}

            *)

            By the way, you can be far more efficient:

            a = Range[10]
            

            share|improve this answer

            • can we give the list of position which I wanted to drop like {3,5,8,9}
              – acoustics
              Nov 29 at 7:49

            • 2

              Delete[a,{{3},{5},{8},{9}}]
              – David G. Stork
              Nov 29 at 7:50

            • 1

              Also Delete[a, Partition[{3, 5, 8, 9}, 1]] comes to mind… if the list of positions gets longer.
              – Henrik Schumacher
              Nov 29 at 8:04

            up vote
            5
            down vote

            accepted

            Use instead Delete, in this way:

            a = Table[i, {i, 1, 10}];
            Delete[a, {{5}, {8}}]
            

            (*

            {1, 2, 3, 4, 6, 7, 9, 10}

            *)

            By the way, you can be far more efficient:

            a = Range[10]
            

            share|improve this answer

            • can we give the list of position which I wanted to drop like {3,5,8,9}
              – acoustics
              Nov 29 at 7:49

            • 2

              Delete[a,{{3},{5},{8},{9}}]
              – David G. Stork
              Nov 29 at 7:50

            • 1

              Also Delete[a, Partition[{3, 5, 8, 9}, 1]] comes to mind… if the list of positions gets longer.
              – Henrik Schumacher
              Nov 29 at 8:04

            up vote
            5
            down vote

            accepted

            up vote
            5
            down vote

            accepted

            Use instead Delete, in this way:

            a = Table[i, {i, 1, 10}];
            Delete[a, {{5}, {8}}]
            

            (*

            {1, 2, 3, 4, 6, 7, 9, 10}

            *)

            By the way, you can be far more efficient:

            a = Range[10]
            

            share|improve this answer

            Use instead Delete, in this way:

            a = Table[i, {i, 1, 10}];
            Delete[a, {{5}, {8}}]
            

            (*

            {1, 2, 3, 4, 6, 7, 9, 10}

            *)

            By the way, you can be far more efficient:

            a = Range[10]
            

            share|improve this answer

            share|improve this answer

            share|improve this answer

            answered Nov 29 at 7:25

            David G. Stork

            22.7k22051

            22.7k22051

            • can we give the list of position which I wanted to drop like {3,5,8,9}
              – acoustics
              Nov 29 at 7:49

            • 2

              Delete[a,{{3},{5},{8},{9}}]
              – David G. Stork
              Nov 29 at 7:50

            • 1

              Also Delete[a, Partition[{3, 5, 8, 9}, 1]] comes to mind… if the list of positions gets longer.
              – Henrik Schumacher
              Nov 29 at 8:04

            • can we give the list of position which I wanted to drop like {3,5,8,9}
              – acoustics
              Nov 29 at 7:49

            • 2

              Delete[a,{{3},{5},{8},{9}}]
              – David G. Stork
              Nov 29 at 7:50

            • 1

              Also Delete[a, Partition[{3, 5, 8, 9}, 1]] comes to mind… if the list of positions gets longer.
              – Henrik Schumacher
              Nov 29 at 8:04

            can we give the list of position which I wanted to drop like {3,5,8,9}
            – acoustics
            Nov 29 at 7:49

            can we give the list of position which I wanted to drop like {3,5,8,9}
            – acoustics
            Nov 29 at 7:49

            2

            2

            Delete[a,{{3},{5},{8},{9}}]
            – David G. Stork
            Nov 29 at 7:50

            Delete[a,{{3},{5},{8},{9}}]
            – David G. Stork
            Nov 29 at 7:50

            1

            1

            Also Delete[a, Partition[{3, 5, 8, 9}, 1]] comes to mind… if the list of positions gets longer.
            – Henrik Schumacher
            Nov 29 at 8:04

            Also Delete[a, Partition[{3, 5, 8, 9}, 1]] comes to mind… if the list of positions gets longer.
            – Henrik Schumacher
            Nov 29 at 8:04

            up vote
            3
            down vote

            Drop[a, {5, 8, 3}]
            

            {1, 2, 3, 4, 6, 7, 9, 10}

            Fold[Drop[#, {#2}] &, a, Reverse[{5, 8}]]
            

            {1, 2, 3, 4, 6, 7, 9, 10}

            share|improve this answer

              up vote
              3
              down vote

              Drop[a, {5, 8, 3}]
              

              {1, 2, 3, 4, 6, 7, 9, 10}

              Fold[Drop[#, {#2}] &, a, Reverse[{5, 8}]]
              

              {1, 2, 3, 4, 6, 7, 9, 10}

              share|improve this answer

                up vote
                3
                down vote

                up vote
                3
                down vote

                Drop[a, {5, 8, 3}]
                

                {1, 2, 3, 4, 6, 7, 9, 10}

                Fold[Drop[#, {#2}] &, a, Reverse[{5, 8}]]
                

                {1, 2, 3, 4, 6, 7, 9, 10}

                share|improve this answer

                Drop[a, {5, 8, 3}]
                

                {1, 2, 3, 4, 6, 7, 9, 10}

                Fold[Drop[#, {#2}] &, a, Reverse[{5, 8}]]
                

                {1, 2, 3, 4, 6, 7, 9, 10}

                share|improve this answer

                share|improve this answer

                share|improve this answer

                edited Nov 29 at 7:49

                answered Nov 29 at 7:35

                kglr

                175k9197402

                175k9197402

                    draft saved
                    draft discarded

                    Thanks for contributing an answer to Mathematica Stack Exchange!

                    • Please be sure to answer the question. Provide details and share your research!

                    But avoid

                    • Asking for help, clarification, or responding to other answers.
                    • Making statements based on opinion; back them up with references or personal experience.

                    Use MathJax to format equations. MathJax reference.

                    To learn more, see our tips on writing great answers.

                    Some of your past answers have not been well-received, and you’re in danger of being blocked from answering.

                    Please pay close attention to the following guidance:

                    • Please be sure to answer the question. Provide details and share your research!

                    But avoid

                    • Asking for help, clarification, or responding to other answers.
                    • Making statements based on opinion; back them up with references or personal experience.

                    To learn more, see our tips on writing great answers.

                    draft saved

                    draft discarded

                    StackExchange.ready(
                    function () {
                    StackExchange.openid.initPostLogin(‘.new-post-login’, ‘https%3a%2f%2fmathematica.stackexchange.com%2fquestions%2f186943%2fhow-to-drop-certain-elements-in-certain-positions-from-a-list-using-drop-functio%23new-answer’, ‘question_page’);
                    }
                    );

                    Post as a guest

                    Required, but never shown

                    Required, but never shown

                    Required, but never shown

                    Required, but never shown

                    Required, but never shown

                    Required, but never shown

                    Required, but never shown

                    Required, but never shown

                    Required, but never shown

                    Related Post

                    Leave a Reply

                    Your email address will not be published. Required fields are marked *