How do I add values to specific values/ specific place of an already existing array?

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Goncalo Costa 2021-10-13

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https://ww2.mathworks.cn/matlabcentral/answers/1562716-how-do-i-add-values-to-specific-values-specific-place-of-an-already-existing-array

编辑： C B 2021-10-15

I have an array of number, t , from which I have extracted some elements at even intervals (every 30 elements, one was extracted) into an array, A.

I now intend to select specific elements in A that meet a condition (if statement), and add x elements to it (x/2 to each side). These new elements to be added are the ones around those specific elements in t (x/2 in each side).

e.g. t = [1.5, 2.5 ,3.5, 4.5, 5.5 ,6.5, 7.5, 8.5, 9.5, 10.5] ;

A = [3.5, 5.5, 7.5],

and in this case I will choose x = 2 elements.

I want to add 2 elements from t to A and finish with A = [ 2.5 ,3.5, 4.5, 5.5 , 6.5, 7.5, 8.5 ]

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Answer 1

C B 2021-10-13

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https://ww2.mathworks.cn/matlabcentral/answers/1562716-how-do-i-add-values-to-specific-values-specific-place-of-an-already-existing-array#answer_807761

编辑：C B 2021-10-15

@Goncalo Costa will this work for you?

t = [1.5, 2.5 ,3.5, 4.5, 5.5 ,6.5, 7.5, 8.5, 9.5, 10.5]
t = 1×10
    1.5000    2.5000    3.5000    4.5000    5.5000    6.5000    7.5000    8.5000    9.5000   10.5000
A = [3.5, 5.5, 7.5]
A = 1×3
    3.5000    5.5000    7.5000
x = 2
x = 2
reqx =x/2;
Index = arrayfun(@(x) findstr(x,t),A)
Index = 1×3
     3     5     7
finalIndex =[];
for i=1:length(Index)
    finalIndex = [finalIndex Index(i)-reqx:Index(i)+reqx]
end
finalIndex = 1×3
     2     3     4
finalIndex = 1×6
     2     3     4     4     5     6
finalIndex = 1×9
     2     3     4     4     5     6     6     7     8

finalIndexUnique = unique(finalIndex)
finalIndexUnique = 1×7
     2     3     4     5     6     7     8
requiredAnswer = t(finalIndexUnique)
requiredAnswer = 1×7
    2.5000    3.5000    4.5000    5.5000    6.5000    7.5000    8.5000