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Sep
23
comment Really advanced techniques of integration (definite or indefinite)
+1 Risch's algorithm has a 100 page summary. Talk about an advanced technique.
Sep
4
accepted Transforming a nonlinear system to a linear system
Sep
4
comment Transforming a nonlinear system to a linear system
It is part of a much larger nonlinear regression problem. But this can also stand alone on its own. I have three points and I want to determine $a$, $b$, and $c$ so that the Lorentzian curve goes through those three points. If I solve the nonlinear system, I need iterative methods and a starting value. I am trying to see if I can transform it into a linear system and then use a direct linear solver without an initial value.
Sep
4
comment Transforming a nonlinear system to a linear system
Not quite what I was looking for. I don't want to solve the 3x3 system using exact arithmetic. I want to change the nonlinear system to a linear 3x3 system so that I can use a numerically stable direct linear solver. This method is unstable if any of the $y_i$'s are too close or too far apart. +1 for solving the Lorentzian system though. Thanks.
Sep
4
asked Transforming a nonlinear system to a linear system
Aug
30
reviewed Close Linear Transformation $T-T^2=I$
Aug
30
reviewed Close Caratheodory's Construction: Idea?
Jul
16
comment How to fill in these steps to evaluate this Gaussian integral?
Cool, thanks. I'll keep playing with this and see if I can use this to get the general case.
Jul
13
revised How to fill in these steps to evaluate this Gaussian integral?
added 276 characters in body
Jul
13
comment How to fill in these steps to evaluate this Gaussian integral?
I know for $\mu=0$, the sum is zero. But how can we get the expression even for $\mu=0$?
Jul
13
asked How to fill in these steps to evaluate this Gaussian integral?
Jul
2
awarded  Curious
Jul
2
comment Units of a log of a physical quantity
You reasoning is flawed. Different units can be multiplied/divided but they cannot be added/subtracted. For example, you can divide meters by seconds and get meters per seconds but you cannot add seconds+meters. That is why taking the log of a unit doesn't make sense because log(1+x) = x-x^2/2+x^3/3... So how can you add sec-sec^2+sec^3...?
Jun
12
reviewed Approve suggested edit on Can a coin with an unknown bias be treated as fair?
May
12
answered College Math Competitions
May
3
answered Prove that integral is independant of its parameter
Apr
30
awarded  Yearling
Apr
4
comment Math resources for electrical engineering?
@Pacerier Because reviews are personal opinions and some people are bound to genuinely dislike something no matter what others may think of it. In this case, some people think that Kresyszig is bad for first-time-learning-something but excellent for later reference/quick review and hence the "bad reviews". In my opinion, it is excellent for both because I have used it for both. An excellent introduction to basic ODEs/PDEs, linear algebra, numerical analysis, Fourier analysis, Numerical PDEs. It has helped me with graduate courses and exams too later on.
Mar
26
reviewed Leave Open With rows have a -1 in its third column? (matlab)
Mar
26
reviewed Close Infinite chessboard question