Concatenating Matrices with different columns

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Linden
Linden 2014-1-31
评论： Youssef Khmou 2014-1-31
Hi, Is there an easy way to concatenate matrices with different columns? That is, if A is 2x3 and B is 2x5, how do I make C=A;B? The problem is sometimes columns in A is larger than columns in B and vice versa.
Thanks.

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回答（2 个）

Youssef Khmou
Youssef Khmou 2014-1-31
编辑：Youssef Khmou 2014-1-31
Linden,
One of the ways is to use cells, here is an example,
A=rand(2,3);
B=rand(2,5);
C=cell(2,1);
C{1,1}=A;
C{2,1}=B;
Walter Roberson
Walter Roberson 2014-1-31
Numeric matrices cannot have varying number of columns. Cell matrices can contain multiple objects that do not need to be the same size as each other.
You can pad matrices as you put them together: compare their size() to figure out how the padding needs to happen.
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Walter Roberson
Walter Roberson 2014-1-31
You can fill with numbers other than zeros, including NaN. NaN would allow you to unambiguously detect padding without danger that actual values to calculate with might happen to be NaN, which would potentially be a problem with padding with 0.

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