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To find details about our offer of reference materials or to order items online, please select one of our main categories from the list About IAEA Reference Materials. Reference Material Online Catalog ** sage: matrix**.identity(2) [1 0] [0 1]. INPUT: The matrix command takes the entries of a matrix, optionally preceded by a ring and the dimensions of the matrix, and returns a matrix Pushes the current transformation matrix onto the matrix stack. Understanding pushMatrix() and popMatrix() requires understanding the concept of a matrix stack

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