# Tagged Questions

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### Symbol or name for Basismatrix of Linear Programming

This question is about the Basismatrix in the context of Linear Programming. Basically (haha!) we have the Matrix of the standard (or normal) form, which consists of (A|E) with the coefficient matrix ...
36 views

### problems on define set with polynomials

I'm trying to say set A is the set of nonnegative integers that not of this two forms $3x^2 + (6y-4)x - y\$ and $\ 3x^2 + (6y-2)x + (y - 1)$, for example: $4=3 \cdot1^2+(6 \cdot1-4) \cdot 1-1\$ is ...
167 views

### Combine a rotation matrix with transformation matrix in 3D (column-major style)

I'm trying to concatenate a rotation matrix with a 4x4 homogeneous transformation matrix with column-major convention. I want this rotation matrix to perform a rotation about the X axis (or YZ plane) ...
59 views

### Order of operations: Matrix product and hadamard product

Is there any convention of the order of operations in a term with both ordinary matrix multiplication and hadamard (elementwise) multiplication? Obviously, $$A ( b \circ c ) \ne (A b) \circ c$$ ...
Is there a convention to write the all ones matrix in formulas? I'm going to write about the following formular: $$A = B + XD + DX + N$$ Where D is a diagonal matrix and X the all ones matrix:  ...