unset an array index

• 03/28/2025 at 1:48 AM #245370
  RiDA_hrn

  hello
  i have an array which contain highs and when break this high, i want to remove this high value from array
  i’m looping through array to draw segments of each value in this array which is highs.
  when break high i want to do like that
  unset($A[i])  or $A[i] = 0 idk …. i need help

  

  RiDA_hrn

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  03/28/2025 at 8:45 AM #245374
  LucasBest

  Hello,

  you can either :
  * $A[i] = 0 // set previous high in your array to 0 so that you know that this high is no longer relevant. When you need to draw, if the value is 0, then you don’t draw… It is the simplest method.
  * remove that index value by recording all values of the array that come after in previous index, like if you remove a plate from the middle of a pile of plate (the one above replace the removed one, the one above the one above remove the one that was directly above, etc…). That is kind of unset($A[i]) which does not exist in prorealcode.
  => this require more time when the high is broke but will keep your array smaller and thus your code will require less time in a long run…

  Removing plates from a pile

  // Ai => is the index that is pointing to last index of the array. i = 0 While i <= Ai do if high > A[i] then // Test if the high is broke Ai = Ai-1 For j = i to Ai do A[j] = A[j+1] Next endif i = i+1 wend

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  // Ai => is the index that is pointing to last index of the array.   i = 0 While i <= Ai do   if high > A[i] then // Test if the high is broke   Ai = Ai-1 For j = i to Ai do A[j] = A[j+1] Next endif   i = i+1 wend

  Something like that… (I did not tested it)

  2 users thanked author for this post.

  robertogozzi, Iván

  

  LucasBest

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  03/29/2025 at 1:03 AM #245399
  RiDA_hrn

  when use ARRAYSORT is index change ? for example : i0 = 10 , i1 = 5  , i2= 12 when apply arraysort ascend is i0 = 5 ?

  

  RiDA_hrn

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  03/29/2025 at 1:05 AM #245400
  RiDA_hrn

  when use arraysort is index change ? for example : i0 = 10 , i1 = 5 , i2 = 12 … when use arraysort ascend, is i0 = 5 ?

  

  RiDA_hrn

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  03/29/2025 at 9:22 AM #245402
  LucasBest

  Yes, if you use arraysort, it will change data in each index.

  It will not change anything for the code above, as long as you use arraysort outside the while…wend boucle.

  But if you don’t care about the order of the array, you can also use arraysort to accelerate the process of removing the data that are no longer relevant.

  If you want to keep the ability of using the instruction “Iset”, you can use a temporary array to keep only relevant data, then use “unset” to delete the first array and then move back the data in it…

  There is always lot of solutions, the best (fast, shorter, etc) one will depend on what you plan to do with your code…

  

  LucasBest

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