Help finding orthonormal basis of matrices

Basically I am a complete MATLAB novice, but since I am doing a course in it at university I am trying to improve! Firstly, am I right in thinking that to find the orthonormal basis of a matrix A I would simply type B=orth(A)?
Secondly, how would I use the function pinv to find the orthonormal basis of a matrix? Lastly, how would I find a basis for a row or column space of a matrix?
I would greatly appreciate any help!

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