Answered
Trying to plot a frequency response (magnitude and angle) using the equation of a forced vibration
Hi Bryanna, The problem statement asks for delta_t of .01, but you have .1 instead. Changing to .01 makes things clearer. The...

4 years ago | 1

Answered
How do I get rid of certain values with the same X-axis value in a certain range?
Hi Michael, here is one way, assuming that x (many values of which are repeated) and y are two columns. tol = 10; a = polyfit...

4 years ago | 0

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Answered
MATLAB and LAPACK implementation of the SVD algorithm - not the same output?
Hi Danijel, actually it's the columns that have different signs. That's for the following reason: Suppose the svd of the matr...

4 years ago | 0

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I need help with a Triple Integral
Hi Francisco. this is really just a 1d integral. Since nothing depends on theta, the theta integration instantly gives an over...

4 years ago | 0

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convolution product calculater impulse response
Hi amjad, You have to keep the indices within the bounds set by dx and dh. For the j loop, you can use the line for j=max(1,i...

4 years ago | 0

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Answered
Why is the magnitude spectrum spreaded over certain frequency range instead of line spectrum in FFT?
Hi lekhani, The spread is happening because you don't have a pure, CW, constant-amplitude cosine wave in the time domain. That...

4 years ago | 0

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Answered
How to determine the lag angle between two snine wave
Hi Hassan Consider the complex wave exp(i*(w*t+theta)) = cos(w*t+theta) + i*sin(w*t+theta) While it's true that the cos a...

4 years ago | 0

Answered
Yellow Colormap on contour lines
Hello Juan using: doc colormap will bring up all of the preconstructed choices. In this case it looks like 'hot' was used. 'a...

4 years ago | 0

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I am trying to find values of four constants from four equations. Yet the code is unable to give out values
Hi Sahir, you have to load this beam in some manner in order to get nonzero deflection. If all the boundary conditions are set...

4 years ago | 0

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What is this fft code doing?
Hi kcee, The code (I'll refer to it by line below) is not doing what it is doing very well. Let's start with the good part, th...

4 years ago | 0

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How to approximate a triple integral over a rotated grid?
Hi Oscar, Before the cyinder is tilted, you are describing the volume with cylindrical coordinates and finding the moment of in...

4 years ago | 0

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Answered
How to plot the subplots but with less lines of code?
HI muhammed all you need to do is put the subplots into a for loop and change the things that vary with subplot. That is the d...

4 years ago | 1

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Answered
I have code which calculates the electric potential due a single charge. The results are concentric circles (Correct results) but don't match the theoretical data
Hi Matthew, probably a bit late to be answering this now, but thanks to some editing done by John Kelly at Mathworks it provide...

4 years ago | 0

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Huffman Dictionary, error with index exceed when i give specific probabilities.
Hi Rafael, sum(probabilities) ans = 1.0003 SInce the probabilities don't add up to 1, the code is going to have problems. ...

4 years ago | 1

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Answered
roots of 3*3 matrix determinant
Hi Cern, I assume you mean the three values of w that give a 0 determinant. Eig works for this. K = rand(3,3) c = diag([12 2...

4 years ago | 0

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Answered
LDL does not support complex symmetric matrices
Hi Nathan, the LDL decomposition works for hermitian matrices. In LDL the D matrix is hermitian, so if A = L*D*L', then A' ...

4 years ago | 1

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fft showing frequency components at double rates
Hi Sina, Here is an observation and a possible answer. If you expand out plot(t,y) (I used xlim([4 4.1]*1e-12) ) there ar...

4 years ago | 0

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Answered
Solving set of coupled non-linear ode using ode45
Hi Ajai, The angles appear to be measured from the horizontal, not the vertical. That's because the terms involving g use cos(...

4 years ago | 0

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Answered
Energy eigenvalues plot of a Hamiltonian(Weyl)
Hi Vira, The plot has no room for px so I assumed it was zero. px=0 corresponds to E(17,:,:,:). Then everything seems to come...

4 years ago | 0

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Answered
when I am subtracting two same values found out from different equations not giving 0, it is giving imaginary value
Hi Bikram, this is all because of precision issues when dealing with floating point numbers. After running your code, tminusx...

4 years ago | 0

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Answered
Is there a way I can convert image (pixel) values to Raman shift using MATLAB?
Now that the peaks in both pixels and cm^(-1) are provided, you can do a linear fit, which is very close. p = [155.56834, 396.5...

4 years ago | 0

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Why does a sine bandwidth decrease with 1/dur, dur beeing the signal duration
Hi Jonas, I believe what you are seeing is just the natural reciprocal relation between width in the time domain and width in t...

4 years ago | 0

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Answered
PCA output gives NaN after normalizing input matrix
Hi Christopher, I am not making any comment on the svd procedure, but f = find(all(obs==0)) f = 79 80 81 82 83 ...

4 years ago | 0

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Answered
How to sort a vector based on the absolute difference of the sorted vector
Hi Awais, a= [2,3,6,12,7,18,25,0,28,5] b = sort(a)' % column vector c = [b(1:end-1) b(2:end)]; d = [diff(c,[],2) ...

4 years ago | 1

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Answered
solve equation in Matlab and for loop
Hi Myrto you have a sixth degree polynomial to solve and find the roots. However, there are no algebraic solutions for the roo...

4 years ago | 0

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Answered
Hankel function, mathematical definition
Hi Kevin, The hankel functions h that you cited are spherical hankel functions, which have half-integer order and are related t...

4 years ago | 1

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Answered
Different method of calculation the same thing give different values?
Hi Ariwan, The differences here are all down at the level of machine precision. Differences on the order of 1e-16 happen all t...

4 years ago | 1

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Answered
How do I plot an FFT of a large data set?
Hi Angelica, One possible reason is that the data has a DC offset, i.e. its mean is not zero. What can happen is that the DC o...

4 years ago | 0

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Answered
fourier transform shifted graphic
Hello MK First of all it is not a good idea to have a variable called 'sum' because that's the name of a basic Matlab function....

4 years ago | 1

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Answered
Maximize answer of second order Polynomial inequality
Hi Luuk It makes more sense to find the boundaries of the inequality: syms x eqn1 = 0.99*x^2-99==0; x_num = solve(eqn1, x) ...

4 years ago | 1

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