Recent content by morry

Thanks anaemic.

hey guys, I've got to do some Fourier series work using matlab, but I have no idea what to do. Ive found the coefficients by hand, but now I need to use MATLAB to evaluate and tabulate the first 8 terms. I then have to evaluate the series at 1000 points over a certain range. Does...

Cheers Benorin, partial fractions are no worries, just that exponential that was confusing me, seems pretty simple now.

Ok, so after finding values for A,B,C, do I just use the tables in order to work out the individual bits? ie ((-2e^-s)*A)/s etc?

Ahh, yeah that would be correct. oops

Hey guys, I am supposed to find the Laplace transform of a set of ODEs. Ive broken it down a bit and I am left with finding the Laplace transform of: (-2e^-s)/(s(s+4)(s+1)) Is this something I have to use partial fractions for? Or is there another way? I am a bit confused.

Oh ok. Sorry about that. Well: g(t)= 1 for 0<t<2 and g(t)= -1 for t>2 And g(t)=0 for t<0 edit: I just read what you wrote. It sounds like what I've got. Looks like I did kinda understand what I was doing afterall. Cheers.

hey guys, I am having a bit of trouble finding the equation for the following graph. I know it should look something like: u(t)-2u(t-2), but I don't really understand it. Can someone point me in the right direction?

Same title, by Erwin Kreyszig is really good. I have no idea how much it costs over there, but down under its about $100.

Thanks for the help again Tide, I think I've got it all out! Finally!

Thanks Tide. I am not having trouble doing the maths by hand. I can find line integrals no worries by hand its just that I have no idea how to use matlab.

Thanks Tide. I must still be doing something wrong. The graph is archimedes spiral. r= theta Heres what I've tried to do: >>syms x y r theta >>x=r*cos(theta) >>y=r*sin(theta) >>ezpolar(x,y) I only need to plot from theta= 0-->2pi Im really lost. Any info on how to do line integrals would...

Ok, so I've been given a curve in polar coordinates. I came up with a parameterisation: x(t)=rcos(theta) y(t)=rsin(theta) But now I have to plot the graph using MATLAB and I have no idea. Theta lies between 0 and 2pi. This is what I put in and got back in matlab: >> t=[0:pi/50:2pi]...

Thanks astronuc. I know what youre on about now. I had the exam this morning and I think I did quite well. No questions on sprinkler efficiency though. :)

Im not sure if that equation is right, I am pretty sure, but not 100%. I understand the vol. ratio now. Thanks :) As for the equivalence ratio, its defined as actual ratio/stoich ratio. But don't worry about trying to explain everything to me, I had the exam this morning, I think it went...