Deleting an entry from an array in MATLAB

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math8
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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]?
 
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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.
 
Or even just A( A==4) = [] will work.