Update : Merge two arrays Matlab

Question

This is an updated version of the question Merge two arrays Matlab

Suppose the two arrays are now

    A1 = [x1 y1
          x2 y2
          x3 y3
          0  0
          0  0
          0  0
          0  0
          0  0
              ]

and

   A2 = [a1 b1
          a2 b2
          a3 b3
          a4 b4
          0  0
          0  0
          0  0
              ]

Now, how to merge A1 and A2 in the shortest way, such that

The earlier answer was correct and it removes all the zeros. But how to achiev this in the shortest way by indexing , similar to the previous answer?

Update :

This is what I tried Using the answer from the previous question

    A=[A1(max(A1')>0,:);A2(max(A2')>0,:)]
    A = padarray(A,[size(A1,1) - size(A,1) 0],'post')

It is pretty trivial, but as I have mentioned in my question clearly, is there an one line answer or a command that can achieve this like the previous question? My main aim is to expand my knowledge base on how to effectively use the indexing advantage of matlab and act as a guide for others as well who will come across this question, with many suggestions it may have.

Thanks, LN

it is just the size of A1. Please check the size of A1 and A2. — Lakshmi Narayanan
– Lakshmi Narayanan, Commented Apr 30, 2014 at 14:54
well, this looks like a pretty trivial extension of your previous question. Why don't you try to work out the solution yourself, then you ask here if something goes wrong? — Acorbe
– Acorbe, Commented Apr 30, 2014 at 14:57
I tried, and got a long way out. Am new to this @Acorbe, exp indexing arrays and was facing a deadline. So was not able to try new things. Am sorry if am asking too much. — Lakshmi Narayanan
– Lakshmi Narayanan, Commented Apr 30, 2014 at 15:07
please check the edits @Peter I hope am able to convince you guys that I tried something. — Lakshmi Narayanan
– Lakshmi Narayanan, Commented Apr 30, 2014 at 15:38

Robert Seifert · Accepted Answer · 2014-04-30 15:04:39Z

2

How about:

A2(length(A1),2) = 0;
A = A1 + circshift( A2,find(A1(:,1),1,'last'))

answered Apr 30, 2014 at 15:04

Robert Seifert

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Stewie Griffin · Accepted Answer · 2014-04-30 19:58:48Z

1

An alternative to thewaywewalk's answer is:

A = zeros(size(A1)); 
A(1:nnz([A1;A2])/2,:) = reshape(nonzeros([A1;A2]),[],2)

answered Apr 30, 2014 at 19:58

Stewie Griffin

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Rafael Monteiro · Accepted Answer · 2014-05-01 03:50:22Z

0

Based on Robert P.'s answer (as the OP requested a one line answer):

A = [reshape(nonzeros([A1;A2]),[],2); zeros(size(A1,1) - nnz([A1;A2])/2, 2)]

answered May 1, 2014 at 3:50

Rafael Monteiro

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