Recent content by zhaniko93

I don't quite understand, my book said that \delta(n) is 1 for n = 0 and 0 otherwise. now you're saying that it is infinity? is it dirac delta or kroneker delta? how should I distinguish? (on wikipedia, \delta[n] is kroneker and \delta(w) is dirak, so I should distinguish by [] and (), but in...

Thanks krome. yes I meant w = 0, so for w=0 the sum doesn't converge. but I found such formula for DFTF of 1: so for w=0 (and other 2πk numbers) I get 2π. did i get something wrong? also, for w not equal to 2πk, I get 0, so that sum must converge to 0. can you give any hint how should I...

Hello. I'm stuck on calculating DTFT of 1. DTFT formula is: so dtft of 1 is: 1) in case of w=1, sum becomes: doesn't it diverge? 2) in case of w no 1, how the hell should that sum be calculated? thanks

Thanks milesyoung, it helped!

Matlab syms y(t) x(t) a t Dy = diff(y); A = dsolve(diff(y, 2) + 4*y == dirac(t), y(0) == 0, Dy(0) == -1); ezplot(A, [0 10]) pretty(laplace(A)) I get something slightly different in matlab

Homework Statement I'm given the transfer function of LTI system is \frac{1}{s^2 + 4} Homework Equations H(s) = \frac{Y(s)}{X(s)} The Attempt at a Solution first of all I had to find diff. equations of the system. I found that it's y'' + 4*y = x; Then they asked to find such...

It didn't help :((((

I want MATLAB to write my expression of type a/(b+ci)(d+li) to a+bi form and then give b

I have such MATLAB problem: I create variables R1 RF R2 and w so: Code: syms RF R1 R2 w then I write expression: Code: 3*R1*w*(RF + 200)/((R2*w*29*i + 3)*(3*R1*w - 2*i)) which gives: Code: (3*R1*w*(RF + 200))/((3*R1*w - 2*sqrt(-1))*(R2*w*29*sqrt(-1) + 3)) why sqrt(-1) and not i...

anybody please

I have such MATLAB problem: I create variables R1 RF R2 and w so: syms RF R1 R2 w then I write expression: 3*R1*w*(RF + 200)/((R2*w*29*i + 3)*(3*R1*w - 2*i)) which gives: (3*R1*w*(RF + 200))/((3*R1*w - 2*sqrt(-1))*(R2*w*29*sqrt(-1) + 3)) why sqrt(-1) and not i? furthermore? if I want real part...

Thanks jsgruszynski. I know that it won't be "too much", but I'm planning to apply for masters degree there, and now I'm learning advanced physics + EE + computer sciences + a lot of math. As I have no time left for anything else, I am wondering if it's better to give up physics and spend more...

I am undergraduate first-year student from Georgia (country, not state of US). I am planning to continue learning in caltech or berkeley on electronics / mechanics faculty. I have been studying physics for 2 years by МГУ program (it's beside university), which used to be the best physics program...