Finite Fourier Transform on a 2d wave
How does the finite fourier transform work exactly?
The transform of f(x) is
\widetilde{f}(\lambda_{n}) =\int^{L}_{0} f(x) X_{n} dx
If I had a 3d wave equation pde and I applied Finite fourier transform on the pde for
z(x,y,t)=X(x)Y(y)T(t)...
1. Homework Statement [/prove f(x1,y1)-f(x0,y0)=fx(x*,y*)(x1-x0)+fy(x*,y*)(y1-y0)
prove there exists a point (x*,y*)
if fx and fy are all continuous on a circular region and contain A(x0,y0) and B(x1,y1)
2. Homework Equations
[b]3. The Attempt at a Solution
I'm thinking mean value...
I'm having a hard time visualising them.
How do you plot vector fields
How do you plot spanning sets?
How do you tell if something spans a plane, 3d, a line or more dimensions.
Javascript is in an external file liked by this:
<script type="text/javascript" src="myscript.js"></script>
in the head tag
i have
<form name="myform" action="" method="POST" onSumbit="return validateForms()">
and some form stuff and then:
<input type="submit" value="Submit"...
1. Homework Statement
F(x,y,z)=0
x=a(y,z)
y=b(x,z)
z=c(x,y)
what does
\frac{\partial c}{\partial x} \frac{\partial b}{\partial z} \frac{\partial a}{\partial y} equal.
2. Homework Equations
maybe you could tell me?
3. The Attempt at a Solution
i've spent hours and hours...
(\frac{\partial z}{\partial x})y
the small y, what does it mean.
the context this is used in is F(x,y,z) where each variable is a function of the other 2 variables.
1. Homework Statement
z=1-x^2-2y^2
find volume under curve
bounded by the xy plane.
is the answer sheet wrong? (see below)
why am i struggling so much with this??!?!?! how do i do it?
2. Homework Equations
according to other answer sheet, it is pi/sqrt 2
3. The Attempt at a...
1. Homework Statement
prove 0u=0 where u is in the vector space.
2. Homework Equations
the 10 various axioms for addition and scalar multiplication.
3. The Attempt at a Solution
pretty much just
(u+-u)u=0
or
(1-1)u=0
1u+-1u=0
and then i get stuck. i can prove that...
1. Homework Statement
In set theory, i have a two part question, the first is showing that the system S={set of all real numbers( \Re )}, #}
where a#b=a+b-ab
we have to show that it's not a group.
and then find what c is so that the system = { \Re \cap\overline{c}, # } is a group.
2. Homework...
Can you give me 3-10 points why you believe in the theory of evolution and/or the big bang? this is independant of any other theories.
I'd like it numbered. and just brief points, like a topic and brief explanation of why this makes you believe evolution and/or the big bang to be true. I'll...
RFID attendance marking, what infrastructure??
im trying to plan for an RFID system.
1)what resources and material and general infrastructure do i need?
2) i think i want it to connect it up to my Uni's intranet maybe wireless, so i'd only need to wire the power source? this good?
3)...
How do you write error messages
for when a function has been given an input that is illogical for what the function does.
in matlab
function b = bla(a)
for example if a < 0
i want it to display a message
1. Homework Statement
romeo proposed to juliet. now hes waiting for her response.
R = 'event that she replies'
W='event that she wants to get married'
Mon = 'event on monday'
Tue = 'event on Tuesday'
P(R\wedgeMon | W) = 0.2
P(R\wedgeTue | W) = 0.25
P(R\wedgeMon| \bar{W}) = 0.05...
so i found this program matlab on the computers at uni. ive been messing around with it. right now im learning a bit about floating point systems and stuff and i thought it would be cool to write up a function that finds the smallest and largest numbers but turns out its harder than i first...
im trying to study but i have um misplaced my textbook. (it ran away from me, after i neglected it whilst doing other assesments)
so i would greatly appreciate just a couple questions with answers, (feel free to give me more though ;) )
on any of these things (in order of priority)
-...
1. Homework Statement
there is a line through A : (1;-2; 1) and B : (0; 2; 3)
and the line through C : (4; 1;-2) and D : (2; 2; 2)
are they parallel?
3. The Attempt at a Solution
i said no they weren't.
i had the lines as being:
(-t+1)i+(4t+2)j+(2t+1)k
and (-2t+4)i+(t+1)j+(4t-2)k...
when integrating by trig substitution why do you use what you use??
for example int. (1+x^2)^0.5 dx
why do you use x= tan u
i mean obviously because it works, but if you didn't know it works how would you figure it out?
i would think that you should use x=sinh u
but ive been trying...
what do you do when m=0, do you just have 1 term + a constant?
what do you do when there is only 1 value for m. do you have Ae^mt + Ate^mt or what?
im a little confused.
EDIT
-for differential equations i mean, when youre trying to solve for y and the equation has differentials of y in...
apply integration by parts twice and swapping the u and v's and then rearranging the equation to say that it is equal to bla/2
like for example i said u is x^n or something and v' is sin x or something.
later on when im faced with another integral, i apply the int by parts but this time...
1. Homework Statement
do a laplace transform on a given non homogeneous equation.
to eventually find out y
2. Homework Equations
i dont think the equation is needed. however this non homogeneous equation is equal to Ae^kt
3. The Attempt at a Solution
well. i applied the laplace...
1 being the worst you can buy right now, 100 the best you can buy right now
i got a mobile intel R 4 series express chipset family
with a booster: nvidia geforce G210M cuda 512Mb
i think thats right. >.> could be wrong though :s
the dxdiag window thing just says the mobile intel r 4 stuff but...
Can someone explain Laplace transformations!!!!!!!!! i dont understand ittttt.
[edit] sorry. i hadnt even heard of laplace transformations until i found it in my assignment.
basically i want to know how to use them
so, some simple, well explained examples perhaps?
1. Homework Statement
i have to create a general formula for integral of (x^n * e^x) dx
using whatever method i deem appropriate. (the only way i could think of is by parts)
2. Homework Equations
int(x^n * e^x)dx
int(uv')dx=uv-int(vu')dx
3. The Attempt at a Solution
i used...
i was taught that i2 = -1
because ((-1)1/2)2=(-1)2/2=(-1)1=-1
but isnt it mathematically correct to say
\sqrt{-1} * \sqrt{-1} = \sqrt{-1*-1} = \sqrt{1} = 1
what the heck!!
Is there some bleedingly obvious thing im missing.
1. Homework Statement
i'm sorry i know i've been bombarding physics forums with questions but i need help :p
using reverse product rule \int uv' = uv - \int vu'
and say i have a*b
i noticed my teaher said that a=u and b=v not v' and he simly made that into a v' by deriving.
is there a...
1. Homework Statement
i have to integrate e^(-y) / y
and i found out that you have to use this exponential integral and someone else said it doesnt have an integral. either way im thoroughly confused
3. The Attempt at a Solution
i have no clue what so ever. The original question had it...