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  2. Rotation matrix - Wikipedia

    en.wikipedia.org/wiki/Rotation_matrix

    If we condense the skew entries into a vector, (x,y,z), then we produce a 90° rotation around the x-axis for (1, 0, 0), around the y-axis for (0, 1, 0), and around the z-axis for (0, 0, 1). The 180° rotations are just out of reach; for, in the limit as x → ∞ , ( x , 0, 0) does approach a 180° rotation around the x axis, and similarly for ...

  3. List of retronyms - Wikipedia

    en.wikipedia.org/wiki/List_of_retronyms

    Originally referred to as the PC bus (8-bit) or AT bus (16-bit), it was also termed I/O Channel by IBM. The ISA term was coined as a retronym by IBM PC clone manufacturers in the late 1980s or early 1990s after the release of the 32 bit Extended Industry Standard Architecture (EISA), which was released after IBM's attempts to replace the AT bus ...

  4. Rotation of axes in two dimensions - Wikipedia

    en.wikipedia.org/wiki/Rotation_of_axes_in_two...

    In mathematics, a rotation of axes in two dimensions is a mapping from an xy-Cartesian coordinate system to an x′y′-Cartesian coordinate system in which the origin is kept fixed and the x′ and y′ axes are obtained by rotating the x and y axes counterclockwise through an angle .

  5. Transformation matrix - Wikipedia

    en.wikipedia.org/wiki/Transformation_matrix

    (Note that if k > 1, then this really is a "stretch"; if k < 1, it is technically a "compression", but we still call it a stretch. Also, if k = 1, then the transformation is an identity, i.e. it has no effect.) The matrix associated with a stretch by a factor k along the x-axis is given by: []

  6. List of Google Easter eggs - Wikipedia

    en.wikipedia.org/wiki/List_of_Google_Easter_eggs

    In 10.0, the text "android 10" will appear, where each of the texts "android", "1", and "0" can be moved and rotated. Rotating "1" and merging with the digit "0" will result in the "android Q" text. In this state, tapping the "Q" several times will reveal a Nonogram game, where the resulting pictures are various icons of Android. [183]

  7. Rotation formalisms in three dimensions - Wikipedia

    en.wikipedia.org/wiki/Rotation_formalisms_in...

    The engineering and robotics communities typically use 3-1-3 Euler angles. Notice that after composing the independent rotations, they do not rotate about their axis anymore. The most external matrix rotates the other two, leaving the second rotation matrix over the line of nodes, and the third one in a frame comoving with the body.

  8. Rotation around a fixed axis - Wikipedia

    en.wikipedia.org/wiki/Rotation_around_a_fixed_axis

    Rotation around a fixed axis or axial rotation is a special case of rotational motion around an axis of rotation fixed, stationary, or static in three-dimensional space.This type of motion excludes the possibility of the instantaneous axis of rotation changing its orientation and cannot describe such phenomena as wobbling or precession.

  9. Left rotation - Wikipedia

    en.wikipedia.org/wiki/Left_rotation

    In a binary search tree, a left rotation is the movement of a node, X, down to the left.This rotation assumes that X has a right child (or subtree). X's right child, R, becomes X's parent node and R's left child becomes X's new right child.