title: Automatically Deleting specific Elements in Mathematica Tables
body: <p>I have a question which can be divided into two subquestions.
  I have created a table the code of which is given below.</p>
  
  <p>Problem 1.</p>
  
  <pre><code>xstep = 1;
  xmaximum = 6;
  numberofxnodes = 6;
  numberofynodes = 3;
  numberofzlayers = 3;
  maximumgridnodes = numberofxnodes*numberofynodes
  mnodes = numberofxnodes*numberofynodes*numberofzlayers;
  orginaltable = 
     Table[{i, 
            node2 = i + xstep, node3 = node2 + xmaximum,
            node4 = node3 - xstep,node5 = i + maximumgridnodes,
            node6 = node5 + xstep,node7 = node6 + xmaximum,
            node8 = node7 - xstep}, 
          {i, 1, mnodes}]
  </code></pre>
  
  <p>If I run this I will get my original table. Basically I want to remove the sixth element and multiples of the sixth element from my original table. I am able to do this by using this code below.</p>
  
  <pre><code> modifiedtable = Drop[orginaltable, {6, mnodes, 6}]
  </code></pre>
  
  <p>Now I get the modified table where every sixth element and multiples of sixth element of my original table is removed. This solves my Problem 1.</p>
  
  <p>Now my Problem 2: </p>
  
  <p>** MAJOR EDITED VERSION**:(ALL THE CODES GIVEN ABOVE IS CORRECT)</p>
  
  <p>Thanks a lot for the answers, but I wanted something else and I made a mistake
  while explaining it initially so I'm making another try.</p>
  
  <p>Below is my modified table: I want the elements in between
   "/** and **/"  deleted and remaining there.</p>
  
  <blockquote>
    <p>{{1, 2, 8, 7, 19, 20, 26, 25}, {2, 3, 9, 8, 20, 21, 27, 26}, {3, 4,10, 9, 21, 22, 28, 27}, {4, 5, 11, 10, 22, 23, 29, 28}, {5, 6, 12, 11, 23, 24, 30, 29}, {7, 8, 14, 13, 25, 26, 32, 31}, {8, 9, 15, 14, 26, 27, 33, 32}, {9, 10, 16, 15, 27, 28, 34, 33}, {10, 11, 17, 16, 28, 29, 35, 34}, {11, 12, 18, 17, 29, 30, 36, 35}, /**{13, 14, 20, 19, 31, 32, 38, 37}, {14, 15, 21, 20, 32, 33, 39, 38}, {15, 16, 22, 21,  33, 34, 40, 39}, {16, 17, 23, 22, 34, 35, 41, 40}, {17, 18, 24, 23, 35, 36, 42, 41},**/ {19, 20, 26, 25, 37, 38, 44, 43}, {20, 21, 27, 26, 38, 39, 45, 44}, {21, 22, 28, 27, 39, 40, 46, 45}, {22, 23, 29, 28, 40, 41, 47, 46}, {23, 24, 30, 29, 41, 42, 48, 47}, {25, 26, 32, 31,43, 44, 50, 49}, {26, 27, 33, 32, 44, 45, 51, 50}, {27, 28, 34, 33, 45, 46, 52, 51}, {28, 29, 35, 34, 46, 47, 53, 52}, {29, 30, 36, 35, 47, 48, 54, 53}, /**{31, 32, 38, 37, 49, 50, 56, 55}, {32, 33, 39, 38,50, 51, 57, 56}, {33, 34, 40, 39, 51, 52, 58, 57}, {34, 35, 41, 40, 52, 53, 59, 58}, {35, 36, 42, 41, 53, 54, 60, 59},**/ {37, 38, 44, 43,55, 56, 62, 61}, {38, 39, 45, 44, 56, 57, 63, 62}, {39, 40, 46, 45, 57, 58, 64, 63}, {40, 41, 47, 46, 58, 59, 65, 64}, {41, 42, 48, 47,59, 60, 66, 65}, {43, 44, 50, 49, 61, 62, 68, 67}, {44, 45, 51, 50, 62, 63, 69, 68}, {45, 46, 52, 51, 63, 64, 70, 69}, {46, 47, 53, 52, 64, 65, 71, 70}, {47, 48, 54, 53, 65, 66, 72, 71}, /**{49, 50, 56, 55, 67, 68, 74, 73}, {50, 51, 57, 56, 68, 69, 75, 74},{51,52, 58, 57, 69, 70, 76, 75}, {52, 53, 59, 58, 70, 71, 77, 76}, {53, 54, 60, 59, 71, 72, 78, 77}}**/</p>
  </blockquote>
  
  <p>Now, if you observe, I wanted the first ten elements
   (1st to 10th element of <code>modifiedtable</code>)  to be there in my final table 
   ( <code>DoubleModifiedTable</code> ). the the next five (11th to 15th elements of <code>modifiedtable</code>) deleted.
  Then the next ten elements ( 16th to 25th elements of <code>modifiedtable</code>) 
  to be present in my final table ( <code>DoubleModifiedTable</code> ) 
  then the next five deleted (26th to 30th elements of <code>modifiedtable</code>) and so on for the whole table.</p>
  
  <p>Let say we solve this problem and we name the final table <code>DoubleModifiedTable</code>.</p>
  
  <p>I am basically  interested in getting the <code>DoubleModifiedTable</code>. I decided to subdivide the problem as it easy to explain.</p>
  
  <p>I want this to happen automatically through the table since as this is just an example table but in reality I have huge table. If I can understand how I can solve this problem for this table, then I can solve it for my large table too.</p>