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David Goodmanson


David Goodmanson

594 total contributions since 2012

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Answered
Constructing an FFT-like result array.
HI betz, All of the following applies if the time domain waveform is REAL For a N point fft, N even: (a) point 1 is the four...

3 días ago | 1

| accepted

Answered
Equation of Motion is Blowing Up
HI Samuel, I won't have access to Matlab for a few days so this needs to be verified, but I believe that in the last line of th...

6 días ago | 0

Answered
transfer functions arithmetic - is it distributive?
Hi Kapil, The second expression is merely the first expression multiplied by (z-1)/(z-1). So the two are equivalent, with the s...

6 días ago | 0

Answered
How can I re-write an anonymous function into a standard function?
Hi Jesus, [ CORRECTED to include a minus sign ] function [returns,variance] = MultiObjective(mu,C,w) returns = -mu'*w'; ...

8 días ago | 0

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Answered
I'm trying to ad a condition to an equation
Hi Xavier, I don't think your original function is overcomplicated at all. It's straightforward code that is self-commenting, ...

10 días ago | 1

Answered
Cholesky Decomposition Column-Wise Algorithm Implementation
Hi J, I added to the code in your last comment by including the obvious missing 'for' statements, etc. After that, it's pretty...

alrededor de 2 meses ago | 1

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Answered
scientific notation in each element
Hi c^2, try "format short g" beforehand. Things stay that way until further notice. To go back to the default you can use ...

alrededor de 2 meses ago | 0

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Answered
FFT of ON OFF signal
Hi imran, you appear to be pretty close on this. The code below uses ftshift to put f = 0 at the middle of the freq array, and...

alrededor de 2 meses ago | 0

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Answered
Centered FFT & DFT: cannot devise required phase shift vector(s).
Hi Peter, here are some phase shifts. I shortened up some of the variable names to make it easier (for me, anyway) to follow w...

alrededor de 2 meses ago | 1

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Answered
Why is 1/ones(3,1) OK while 1/ones(1,3) is not OK?
Hi Yuki, In the expression x = 1/ones(3,1) multiplying both sides on the right by ones(3,1) gives x*ones(3,1) = 1. The row ve...

alrededor de 2 meses ago | 2

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Answered
Bivariate Normal Distribution different for expression and mvnpdf()
Hello Aishwarya, The problem here is that the array x is 2x31 and does not have every possible combination of an element of X1 ...

2 meses ago | 2

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Answered
How do you find the approximate interval that displays the solution?
Hello Isabel, I believe the idea here is that when lambda is large enough, the expression for Tb gets increasingly close to Tb_...

2 meses ago | 0

Answered
ODE45 to solve a system of two coupled 2nd order ODEs
Hi Ricardo, I am inferring that you have the following system with fixed points S: S---k1---M---k2---M---k1---S Then eqn 1 is...

3 meses ago | 0

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Answered
How to element wise exponential of a matrix
Hi Titas, dy = Columns 1 through 10 15.7800 31.5600 47.3400 63.1200 78.9000 94.6800 110.4600 126.2400 142.0200...

3 meses ago | 1

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Answered
Anttena Paterns radiation patterns
Hello MT, The basic issue is setting phi_3db to degrees, but there may also be a problem with the basic definition of phi_3db (...

3 meses ago | 0

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Answered
"Fminunc cannot continue" Error with gamma function
Hi Yasin, You can use the gammaln function which is tailor made for this situation.

3 meses ago | 1

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Answered
How can I find a p-value when dealing with a weighted sum of chi-square distributions?
HI Michael, Since this is a weighted sum instead of a weighted mixture (as I erroneously assumed), the calculation will be alon...

3 meses ago | 0

Answered
Interpreting xcorr results compared to corrcoef
Hi Jonathan, For the input column vectors, corrcoeff subtracts the mean off of each one and normalizes each to be a unit vector...

3 meses ago | 1

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Answered
How to generate matrices that satisfies constraints on sum of row elements and sum of column elements?
Hi sharadhi, Here is an example for 3x3, where all the row and column sums are 100 (looks like you edited the original question...

3 meses ago | 0

Answered
Cumulative distribution function of a function of a random variable
Hi Franziska, a = 1.2; x = .2 y = a*(1+x)*(2/(1+ (1+x)^(1/(a-1))))^(a-1) xx = (y/a)/(2-(y/a)^(1/(a-1)))^(a-1) -1 % ...

3 meses ago | 0

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Answered
FFT interpolation using zero-padding and the Chirp Z-Transform for a single tone sinusoid
Hi Matt, I made one minor change at the beginning of your code, replacing the first four lines with M = 100; m = linspace(0,1...

3 meses ago | 0

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Answered
Fourier transform of table signal
Hello fima, It’s true that the amplitude is off, but frequency is a much more serious issue. The time domain plot shows that t...

3 meses ago | 0

Answered
fourier transform of exp
HI Hadimargo, A few modifications are necessary to make this work out. oo First, in the time domain the exponential function i...

3 meses ago | 1

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Answered
Generate random numbers from a mixture distribution
Hi Thomas. I presume you mean something like the following. A uniform random variable is used to create an index that picks fr...

4 meses ago | 2

Answered
How to rotate the plot attached(Truncated Pyramid) to make its sides parallel to its Axis.
Hi adam, two lines become y(m)=R*sind(n+45); x(m)=R*cosd(n+45);

4 meses ago | 0

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Answered
Trouble with MATLAB Triple Integral
Hi Goerge, The problem with the func([x,y,z]) approach is that there is too much expectation that [x,y,x] is 1x3. Once the int...

4 meses ago | 0

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Answered
Linear interpolation with multiple values for each point
Hi Justin, If the problem is what I think it is, with d and e known, linear interpolation between o and p determined by a<d<b ...

4 meses ago | 0

Answered
Problem with the Color Bar
Hi Hans, try colormap(jet) colorbar by default this has 64 color levels (as does the default colormap, 'parula') and looks m...

4 meses ago | 1

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Answered
Question about fft2(2D Fourier Transform) of a Gaussian function
Hi Zhu Li, A couple of things are going on here. First, there is the checkerboard pattern in the angle plot. I added an extra ...

4 meses ago | 1

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Answered
The power sum of all frequencies seems that the half amount of the middle frequency power is not added. But the algorithm accords with the Parseval theorem. why?
Hi H^2, It helps that you are doing this for four frequencies rather than some crazy huge number of them. x = 1:4; N = length...

4 meses ago | 0

| accepted

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