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Homework Help: Deleting an entry from an array in MATLAB

  1. Jul 16, 2012 #1
    I want a code in MATLAB that produces A\{4}, where A={3,6,1,-3,4,8}.

    I know for instance:
    A=[ 3 6 1 -3 4 8];

    A(5)=[]; produces

    3 6 1 -3 8

    But what should I do if I don't know the index (in this case 5) for the entry '4'; and I want to get
    [ 3 6 1 -3 8]?
     
  2. jcsd
  3. Jul 17, 2012 #2

    jbunniii

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    Science Advisor
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    Gold Member

    You could try something like

    idx = find(A == 4);
    A(idx) = [];

    This will remove all instances of 4 from the array. If the array doesn't contain any 4's, then nothing will be removed.
     
  4. Jul 25, 2012 #3
    Thanks!!
     
  5. Jul 25, 2012 #4

    uart

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    Science Advisor

    Or even just A( A==4) = [] will work.
     
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