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How to use syms to solve system of equations?
Hi NIcholas, This can be done without using syms. Syms of course can be slow, and the result in this case is a typically ponde...

4年以上前 | 2

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How can I obtain the analytical expression (polynomial) of the spline curve from a curve fitting?
Hi Radu, x = 1:10; y = sin(x).^3; a = interp1(x,y,'spline','pp') a = struct with fields: form: 'pp' br...

4年以上前 | 0

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sum of a sum of a sum of a sum
Hi Marta, The code below does not address the algebra in the paper, but I am posting this because it is another way of doing th...

4年以上前 | 1

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How can I define proper frequency domain of FFT function in Matlab
Probably a bit late in the game, but the followiing code shows the peak at 300Thz. A couple of issues here: first to (a) get a...

4年以上前 | 0

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Best way to get rid of/ prevent function from creating complex numbers?
Hello Jeffrey, Deleting unsatisfactory results is of course not a good way to deal with this. I ran case {15} from your matfil...

4年以上前 | 1

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Can I input data with multiple column lengths into one matrix?
Hi Brice, If you preallocate as you mentioned then you can insert each column with t = zeros(300,numslugs); x = zeros(300,num...

4年以上前 | 0

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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年以上前 | 1

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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年以上前 | 0

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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年以上前 | 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年以上前 | 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年以上前 | 0

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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年以上前 | 0

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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年以上前 | 0

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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年以上前 | 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年以上前 | 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年以上前 | 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年以上前 | 0

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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年以上前 | 1

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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年以上前 | 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年以上前 | 1

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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年以上前 | 0

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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年以上前 | 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年以上前 | 0

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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年以上前 | 0

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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年以上前 | 0

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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...

5年弱前 | 0

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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...

5年弱前 | 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...

5年弱前 | 0

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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 ...

5年弱前 | 0

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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) ...

5年弱前 | 1

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