MATLAB Answers

0

How to assign vectors to existing vector

Asked by karishma koshy on 7 Aug 2019
Latest activity Edited by madhan ravi
on 15 Sep 2019 at 7:31
Hi all
I want to assign a set of vectors in place of zero to existing vectors (ventor_2). But I always want to check the the new set of vectors (newvector_2) does not have the number that exist in previous vector (vector_1)
Vector_1 = [ 1 2 3 4]
Vector_2 = [ 2 0 4 0 6 7 ] Newvector_2 = [ 2 5 4 8 6 7]
How can I do that
Thank you

  4 Comments

Show 1 older comment
"new set of vectors (newvector_2) does not have the number that exist in previous vector (vector_1)"
--> is there any order in which the non repeated numbers must occur or should it be totally random?
Yes, it should be in the chronological order
@Guillaume I have got a set vectors vector_1 before vector_2. So I want to confirm that newly assigned numbers to newvector_2 are not present in vector_1. I know how to check for a single number . But how can I do it for all the numbers in the vector?

Sign in to comment.

3 Answers

Answer by Samatha Aleti on 12 Aug 2019

Without logically going to each element you can use functions like find(), intersect(), setxor() for vectorization in achieving what you need. Here is how you can do it:
vector_1 = [ 1 2 3 4];
vector_2 = [ 2 0 4 0 6 7];
% x is the vector whose elements are to be added to vector_2
x = [1 2 5 8];
xcommon = intersect(x, vector_1);
vector_3 = setxor(x,xcommon);
idxZero = find(~ vector_2);
% Truncate additional elements
vector_3(length(idxZero)+1:length(vector_3)) = [];
vector_2(idxZero) = vector_3;
For detailed information on above functions, refer the following document links:

  2 Comments

Where did x come from?
I took "x" as an example here. In your case "x" is the vector set whose elements are to be added in place of zeros of vector_2.

Sign in to comment.


Answer by madhan ravi
on 12 Aug 2019
Edited by madhan ravi
on 15 Sep 2019 at 7:31

newvector_2=vector_2;
ix=nnz(~vector_2);
v12=[vector_1,nonzeros(vector_2).'];
u=unique(v12);
d=setdiff(1:max(v12),v12);
newvector_2(~vector_2)=[d,max(v12)+(1:ix-numel(d))]

  0 Comments

Sign in to comment.


Answer by Andrei Bobrov
on 12 Aug 2019

Let X - interval for input data in 'vector_2'
X = [0, 15];
x = setdiff(X(1):X(2),vector_1); % input data
newvector_2 = vector_2;
lo = vector_2 == 0;
n = sum(lo);
b = repmat(x,1,ceil(n/numel(x)));
newvector_2(lo) = b(randperm(numel(b),n));

  0 Comments

Sign in to comment.