meta user
network profile
| bio | website | |
|---|---|---|
| location | ||
| age | ||
| visits | member for | 2 years, 2 months |
| seen | 13 hours ago | |
| stats | profile views | 102 |
|
Jan 19 |
revised |
Which of these two ways to take the derivative of a delta function times another function is correct? \delta(x)f'(x) not \delta'(x)f(x) |
|
Jan 19 |
suggested | suggested edit on Which of these two ways to take the derivative of a delta function times another function is correct? |
|
Jan 7 |
comment |
Likelihood and proportion a) well you can write it out if you want. I would. b) Take the log of the answer in part (a) and find the $a$ that maximizes that (ie, take derivative, set to 0, solve for $a$). c) I think you just have to write a little program to find the frequency of k in your file. |
|
Jan 1 |
answered | Finding an equation for a circle given two points |
|
Dec 31 |
answered | In this case, does $\{x_n\}$ converge given that $\{x_{2m}\}$ and $\{x_{2m+1}\}$ converge? |
|
Sep 13 |
awarded | Commentator |
|
Sep 13 |
comment |
Is there any math operation defined to obtain vector $[4,3,2,1]$ from $[1,2,3,4]$? It's the called the reverse identity matrix J. J[1 2 3 4]^T = [4 3 2 1]^T. |
|
Sep 10 |
answered | What function is this? |
|
Jul 21 |
comment |
Help with a derivative Just do it the normal way; or take the log of your expression and calculate its derivative. |
|
Jul 20 |
comment |
What are the Axiom of Choice and Axiom of Determinacy? This answer is at the wrong level and self-indulgent. And honestly probably doesn't help the original poster. |
|
Jun 18 |
comment |
Good textbooks on combinatorics for self-study I would not classify this book as introductory at all. |
|
Apr 20 |
awarded | Editor |
|
Apr 20 |
revised |
Transformations of Normal added 47 characters in body |
|
Apr 20 |
answered | Transformations of Normal |
|
Apr 14 |
comment |
Algorithmic Complexity of Iterated Sums I don't think so. Let f(a,n) := {if (n>1) n*f(a,n-1) else 1} = n!. Then f(a,n) is a polynomial-time algorithm using simple operations but F(n) is not a polynomial-time algorithm. |
|
Mar 16 |
awarded | Critic |
|
Mar 16 |
comment |
Recommend a statistics fundamentals book If you just want a review, just read Schaum's Outline of Probability and Statistics. It's less than $16 new. |
|
Mar 5 |
comment |
Explain $-\int^{a}_{b}\frac{Q}{4 \pi \epsilon \bar{r}^{2}} \cdot d \bar{r}= \left[\frac{Q}{4\pi \epsilon \bar{r}}\right]^{a}_{b}$ In American textbooks, curl is usually written $\nabla \times$. |
|
Mar 5 |
answered | More help with implicit differentiation |
|
Mar 2 |
comment |
Line simplification algorithm Is the shape important or is only the frequency of the teeth important? If only the frequency of the teeth, you can use a color gradient instead. You have 5000 points but only 450 pixels, then split the line into fixed number intervals (each with 30 points for example) and calculate how many teeth there are in each interval. Then color code with red for very few teeth and blue for very many teeth. |
