What does this parameter mean?

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med-sweng
med-sweng il 18 Apr 2014
Risposto: Image Analyst il 18 Apr 2014
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.

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Walter Roberson
Walter Roberson il 18 Apr 2014
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.
Image Analyst
Image Analyst il 18 Apr 2014
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.

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