how to form a two-column array for a given but dimmension-unknown array?

Dear All,

I have two array with the same length A and B. I want to form another array C which is formed by A and B. But the dimmensions of A and B are uncertain, sometimes A (B) is a row vector so that C = [A' B'], but sometimes A (B) is a column vector so that C = [A B].

I am wondering if there is a simple way to form array C without checking the dimmensions of A and B.

Thanks.

Benson

Answer 1

[Stephen23]

"I am wondering if there is a simple way to form array C without checking the dimmensions of A and B."

C = [A(:),B(:)]

Answer 2

[Joel Lynch]

You can make a row vector of any N dimensional matrix by linearizing, for example

A( 1:numel(A), 1 ) = A(:);

.Thus, you can always make

C = C(1:numel(A),1:2) = [ A(:) , B(:) ];

[Benson Gou]

Hi, Joel,

I run your code. But the second C = C(1:numel(A),2) = [ A(:) , B(:) ] has the following error message:

Index exceeds array bounds.

Error in function_sub (line 506)

C = C(1:numel(A),2) == [ A(:) , B(:) ];

Thanks a lot.

Benson

[Joel Lynch]

Sorry, should be C(1:numel(A),1:2)=…

or more simply, C=…

I just included the indices so it was clear what size C would be.

[Benson Gou]

I got the following error message again.

Error using horzcat

Dimensions of arrays being concatenated are not consistent.

Thanks.

Benson

[Joel Lynch]

Assuming A and B have the same number of elements, then C=[A(:),B(:)]; should work.

Make sure A, B, and C are cleared and reset before trying this. numel(A) and numel(B) should be the same. And C should not be defined.