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dulanga


Last seen: mer än 4 år ago |  Active since 2014

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poisson need help with this
he Poisson Equation on the square domain 0<x<1, 0<y<1, with u=g(x,y) on the boundary, where Finish this code, with node ...

mer än 5 år ago | 0 answers | 0

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i need help with this question
I am supposed to find the number of timesteps i.e the number of steps taken but my answer is incorrect any inputs on my code wil...

mer än 5 år ago | 0 answers | 0

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plotting help needed (increasing resolution)
this is my code how would i increase the resolution of the graph? N = 101; tmin = 0; tmax = 3; t = linspace(tmin,tmax,N...

mer än 5 år ago | 1 answer | 0

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Question


i need to get the maximum amplitude in this code but my final answer is wrong
The data file https://www.dropbox.com/s/8b8u38ghve7tfv0/Data.mat?dl=0 i get 28400 as the answer but the answer is wrong plus t...

mer än 5 år ago | 1 answer | 1

1

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Question


index exceeded matrix dimensions please help
I get this error what should i do to correct this? Index exceeds matrix dimensions. Error in t31 (line 11) F1=Fmag((N/2)+1:N)...

mer än 5 år ago | 0 answers | 0

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need help with the question
This code is not working i am using this to calulate the amplitude but i am getting this error Index exceeds matrix dimensi...

mer än 5 år ago | 1 answer | 0

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answer

Question


need help with this
turn all the amplitudes of frequencies which are higher than 3500 Hz into 0’s and amplify the rest of the spectrum (by just mul...

mer än 5 år ago | 1 answer | 0

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answer

Question


Initial value problem need help with
How would i go about this ?

mer än 5 år ago | 0 answers | 0

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need help with problem
what is wrong in this code i dont get the correct answer xleft=0; xright=(9*pi)/4; N=20; x=linspace(xleft,xright,N); x=x...

mer än 5 år ago | 2 answers | 0

2

answers

Question


heun mthod 1st order ode
Is this code correct and how do i find which integer time t is the solution y(t) closest to -0.2 y0 = -1; % In...

mer än 5 år ago | 1 answer | 0

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answer

Answered
euler method first order
thanks for your comments John the multiplication when it was supposed to be an addition was a mistake on my part.

mer än 5 år ago | 0

Question


euler method first order
This is my code is this correct? y0 = -1; % Initial Condition h = 0.1; t = 0:h:100; N=lengt...

mer än 5 år ago | 2 answers | 0

2

answers

Question


Lu decomposition help needed
this is as far as i have got can anyone help me? function [L,U] = LUdecomp(A) n = size(A,1); %number of rows m = size(A,2...

mer än 5 år ago | 0 answers | 0

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answers

Answered
residual r=ax-b ∞-norm
Would this be correct to get infinty norm a = [-5 8 -5; 0 0 12; 3 -7 -3;6 -4 4] b = [1;1;1;1] x=a\b r=a*x-b N = norm(r, I...

mer än 5 år ago | 0

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Question


residual r=ax-b ∞-norm
This is my code but i dont get the coorect answer a = [-5 8 -5; 0 0 12; 3 -7 -3;6 -4 4] b = [1;1;1;1] x=a\b r=a*x-b x1=sq...

mer än 5 år ago | 2 answers | 0

2

answers

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product series in matlab
Error when taking zero. clc clear syms k P1 = symprod((k-(4/k))-5 , k, 0, 3) P2 = symprod((k-(4/k))-5 , k, 6, 100)

mer än 5 år ago | 0 answers | 0

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summation using syms and rounding
is this way correct?Also want the number rounded to the first dp. syms k f = k-4/k-5; v1 = subs(f, k, 1:3) s_sum = sum(v...

mer än 5 år ago | 0 answers | 0

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plotting ellipsoid any help
how can i plot this out ? 4x^2 + y^2 + 9z^2 = 36 thanks

mer än 7 år ago | 0 answers | 0

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the question asks to subplot the contours any idea how?
x = linspace (-1,1); y = linspace (-1,1); [X, Y] = meshgrid(x,y); Z=7*sin(pi.*X).*cos(3*pi.*X); surf(X,Y,Z ) hold on con...

mer än 7 år ago | 1 answer | 0

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Question


i get error saying that z should be a matrix and not a scalar
x = linspace (-1,1); y = linspace (-1,1); [X, Y] = meshgrid(x,y); Z=7*sin(pi.*x).*cos(3*pi.*x); surf(X,Y,Z ) hold on con...

mer än 7 år ago | 1 answer | 0

1

answer

Question


secant method help matlab
hi i have been asked to make a function file for secant menthod fxi=f(xi); fxi_1=f(xi_1); % Initialize iteration count ...

ungefär 10 år ago | 0 answers | 0

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