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Apr
15
comment Eigenvalues of block matrix where blocks are related.
You will find information on this by looking up "saddle point problem". In general, $B\neq B^T$, so you may be able to simplify the results you find. Sherman-Morrisson formula may be helpful too if$A$ is invertible.
Apr
13
comment How to represent a system of quadratic equations in matrix form
While not using CVX, fminbnd is a builtin function that finds the minimum of a single variable function.
Apr
7
comment Plotting y=x^(1/y)
$y=x^{1/y}\implies x=y^y$. This function can be plotted easily. WA has trouble with negative inputs though. wolframalpha.com/input/…
Mar
25
reviewed Approve Check if the given set is a subspace or not (Set of polynomial functions)
Mar
1
comment Design an algorithm to solve this LP
If there is the one constraint, you could probably formulate the solution using the techniques for a knapsack problem (en.m.wikipedia.org/wiki/Knapsack_problem)
Feb
5
comment Not getting dot product of Eigen vectors in MATLAB aslo in LAPACK to zeros
Can you post the output that you are getting? That will help us to identify what the issue is. Also include the code that you used as that will be helpful also.
Jan
4
comment How to find the equidistant middle point for 3+ points on an arbitrary polygon?
For three people, it will be the centre of the circle that passes through the three points. For four or more people, it will not always be possible. E.g. People at (1,0), (0,1), (0,0), (-1,-1). For any three of these people, you can find the point that is equidistant to them all, but the fourth person will not be the same distance from that point.
Nov
21
comment Find the limit of the vector as t approaches 0?
Yes. You just take the limit of each component.
Oct
21
comment Intuitive understanding of the -b in this definition of a plane
Hint: A plane that doesn't pass through the origin is written $n\cdot (x-p)=0$, where $p$ is any point on the plane.
Oct
14
reviewed Approve Solving a system of equations - minimizing f
Aug
3
reviewed Approve Do the initial value problem $dy/dx=2y^{1/2}$ , y(0)=a has infinitely many solution for a=0.
Jul
18
awarded  Yearling
Jul
10
awarded  Popular Question
Jun
28
reviewed Approve What is the inverse of $2^x$?
Jun
27
reviewed Approve What does cross product mean in simple words?
Jun
27
answered Linear Algebra: Nullity and Invertibility
May
7
reviewed Approve Verification that $\int x\sin x=\sin x- x\cos x + C$ by differentiating both sides of the equation
Apr
11
comment Solve the differential equation using Taylor-series expansion
@Algohi I don't think it has a name. Googling "solve differential equation with Taylor series" brings up a few results you might find helpful.
Mar
28
comment Least norm solution to $Ax = b$
@mining If $A$ doesn't have full row rank, there are redundant constraints. As long as $b$ is in the column space of $A$ (i.e. $Ax=b$ is consistent), then the redundant constraints can be dropped so that $A$ has full for rank.
Mar
6
comment Matrix Multiplication in Maple
The standard manner I would use to multiply matrices is the dot operator; i.e. A.B; which should do the correct thing. I'm not sure why it would take so long to compute.