What does this parameter mean?

I came about this parameter passed to a function in `MATLAB`:

    [X Y ones(n,1)]

Assume X: x-dimension; Y: y-dimension; n: size

What does the above mean?

Thanks.

Answer 1

[Walter Roberson]

It is equivalent to

horzcat(X, Y, ones(n,1))

ones(n,1) is a column vector of 1's that has n entries in it. If size(X,1) or size(Y,1) is not the same as n, then you would receive an error about incompatible dimensions.

Answer 2

[Image Analyst]

Your "Assume...." sentence is difficult and ambiguous, so I'll just describe it.

In order for that to work, you must have X be a n rows by "whatever" column matrix. Y must also be a n-rows by "whatever"-column matrix. Though the columns for X and Y may be different. ones() makes a n row by 1 column "column vector". The brackets stitch them all together from left to right.