Changing the size of Vector (n no. of zeros to one zero and n no. of ones to 1)

Hi all, I have a vector A and i need to convert it into B. How can i do that with coding? The last value is the only exception in terms of size;

zer= zeros(1,20);
on= ones(1,20);
A=[zer zer on on zer on zer on zeros(1,10)];
B=[0 0 1 1 0 1 0 1 0];

If found zeros put one zero in vector B and if ones then 1 in vector B

[KALYAN ACHARJYA]

Do you want the text to numeric?

[ARN]

No A is vector and so is B. I just randomly made vector A, my original vector is different.

Answer 1

[Rik]

This code should work to remove duplicate values.

A=[1 1 0 0 1 1 1 0 1 0 1];
%A=randi([0 1],1,100);
d=[false diff(A)==0];
A(d)=[];

old code:

If your input follows this pattern strictly, you can just use indexing to get the values:

zer= zeros(1,20);
on= ones(1,20);
A=[zer zer on on zer on zer on zeros(1,10)];
B=[0 0 1 1 0 1 0 1 0];
B2=A(1:20:end);
isequal(B,B2)

[ARN]

Hi, That is the problem. It does not follow the same pattern and also my original vector is lot larger than that. I just made A and B to be in compact form.

[Rik]

So what is the exact pattern? Does it repeat a single value 20 times and do you want to know those values? You should describe what the rules are from extracting B from A.

[Rik]

I missed your edit from your question. If you want to remove repeat values, than my edited answer should work for you.

[ARN]

Thanks! But i think u misunderstood the question as i don't want to remove duplicate to make 0-1 or 1-0 i have a matrix of size [1 x 1120] which contains either 0's(x 20) or 1's (x 20) (completely random) now i want to make this vector of size [1 x 56] by removing/replacing the 20 zeros to only one zero or removing/replacing the 20 1's into only one 1.(cause i already know the 0's and 1's are in 20's) Ref: (1120/20=56)

[Rik]

Then B2=A(1:20:end); will work. It selects the first from every 20 elements in your vector, so it condenses your 1120 element vector down to 56 elements. Then call to end in that indexing takes care of any larger vector.

[ARN]

Hi, Hope u can help again

A1= [- - - - - - - - - 15:30:00 15:30:01 15:30:02 15:30:03 15:30:04 15:30:05 15:30:06 15:30:07 - - - - 15:30:12 15:30:13 15:30:14 15:30:15 15:30:16 15:30:17 - - - - - - 15:30:24 15:30:25 15:30:26 15:30:27 - - 15:30:30 15:30:31 - - ];

How can i get B1 from A1 . A1 is random will change everytime

B1= [0 15:30:00 15:30:07 0 15:30:12 15:30:17 0 15:30:24 15:30:27 0 15:30:30 15:30:31 0];

Thanks, Link to the question: https://www.mathworks.com/matlabcentral/answers/418675-getting-the-indices-of-an-array-with-conditions