What does this parameter mean?

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med-sweng
med-sweng 2014-4-18
回答： Image Analyst 2014-4-18
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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回答（2 个）

Walter Roberson
Walter Roberson 2014-4-18
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 2014-4-18
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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