Is there a quick and easy way to insert/delete values into the middle or beginning of a cell array and/or a numerical array

Question

Robert Garneau 2018-12-16

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评论： Robert Garneau 2018-12-17

I have a cell array and a numerical array. I want to insert values into the beggining, middle and end of the cell array or the numerical array. Is there an easy way to do this.

I also want to be able to delete array elements at the beginning, middle or end of the arrays. Same question...

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Answer 1

Stephen23 2018-12-17

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在 MATLAB Online 中打开

Just use indexing:

>> V = randperm(9)
V =
   9   5   7   3   4   6   8   2   1
>> idx = 3;
>> val = 0;
>> V = [V(1:idx),val,V(idx+1:end)]
V =
   9   5   7   0   3   4   6   8   2   1

Note that this will work for the beginning and end too (try it with idx=0).

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Robert Garneau 2018-12-17

Thank you very much....

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Answer 2

madhan ravi 2018-12-16

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编辑：madhan ravi 2018-12-16

在 MATLAB Online 中打开

a=1:11;
a(1) = somevalue%first element [] square bracket removes that element
a(fix(mean(a))) %mid element
a(end) % last element

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Robert Garneau 2018-12-16

say we have a 4 element array where

a(1) has value 1

a(2) has value 2

a(3) has value 3

a(4) has value 4

I want to be able to insert a new value in a new location anywhere in the array.

Say I want to insert the value 6 after the second element of the array. The new array would look like (note it now has 5 elements):

a(1) would have value 1

a(2) would have value 2

a(3) would have value 6

a(4) would have value 3

a(5) would have value 4

If i then wanted to delete the second element the new array would then have 4 elements again.

a(1) would have value 1

a(2) would have value 6

a(3) would have value 3

a(4) would have value 4

The array would grow and shrink as i inserted and deleted elements. I know I can do this with multiple arrays. The question is, is there an easier way to do it using MATLAB Functions/abilities.

Thanks

Bob