Answered
Valid Shape FFT Deconvolution
Hi Benjamin, Here's an approach for the 'valid' convolution. Problem parameters: x = 1:7; nx = numel(x); h = 1:3; nh = numel...

2 years ago | 0

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Answered
Simulink - Saving Base Workspace Variables
One option is to use the Model Workspace: "Each model is provided with its own workspace for storing variable values."

2 years ago | 1

Answered
Matrices size difference within for loop and unable to perform assignment of elements
Hi mcp0228, The loop variable iNepochs will be a scalar value, hence the LHS of the assignment is a column vector. for iN...

2 years ago | 0

Answered
Why is Symbolic Math Toolbox Giving Decimal Answers?
Check your sympref The defaults are sympref Resulting in [sym(pi) sym(sqrt(3))] But, if you change this pref sympref('Floa...

2 years ago | 0

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Answered
Change content of Simulink Matlab Function block through console
Use MATLABFunctionConfiguration and modify the FunctionScript property.

2 years ago | 0

Question

Can the Symbolic Math Toolbox Be Used to Prove Matrix Identities?
With the following defintions syms s A = symmatrix('A',3); B = symmatrix('B',[3 1]); C = symmatrix('C',[1 3]); L = symmatri...

2 years ago | 1 answer | 0

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answer

Answered
getLoopTransfer is giving the same open loop transfer functions for two different systems
Hi Janki, I'd have to go through the math on the two calls to getLoopTransfer to determine if that result makes sense. Offhand,...

2 years ago | 1

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Answered
using hasSymType(expression, 'constants') returns true when no constants
Hi Andrew, Both of those examples seem to be in accordance with doc hasSymType and children, except that children returns a cel...

2 years ago | 0

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Answered
Can't get symbolic numbers.
Hi Austin, Seems to work here as you expect. sym(1/5) sym(1/5,'r') But the preceeding results are based on the default sympr...

2 years ago | 1

Answered
FFT is shifting my artificial signal?
Hi Zach, a) create the X vector with spacing based on the sampling frequency, Fs b) create the wave vector with sinusoids comp...

2 years ago | 0

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Answered
Assigning certain seed value to Simulink Uniform Random Number block in programmatic way
Hi JW, That looks like a typographical error in the doc (which is odd, I've always imagined stuff like that is generated automa...

2 years ago | 0

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Answered
Number of filter taps in Gaussian filter design
Hi Jay, The doc page for gaussdesign states "The number of symbols between the start and end of the impulse (span) and the num...

2 years ago | 0

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Answered
Inconsistency between the FFT results and the analytic spectrum of a Gaussian function
Hi Sherwin, fft assumes the input sequence starts at k = 0, so we have to apply ifftshift on the input to fft. fs = 10; t = -...

2 years ago | 1

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Answered
How to plug x^2+y^2 in to euler's Method
Hi Michael, Focusing only on the error message ... this line is the source of the error f(i) = x.^(2).*(i)+y.^(2).*(i); ...

2 years ago | 0

Answered
Solving symbolic third order polynomial
Hi Axel, What is the source for the equations in red? Here is Matlab's solution: syms q(t) a0 a1 a2 a3 q0 q1 dq0 dq1 t0 t1; ...

2 years ago | 0

Answered
How to identify transfer function of a motor with IODelay?
Hi Erik, Here's what I tried: Load the data load forum.mat Run the script so I can operate on the same variables. Take note ...

2 years ago | 1

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Answered
Solving symbolically for variables that are equal to several equations
Hmm. Don't know why solve doesn't find a solution, syms xi v r a mu spec_eng1 = [xi == (v^2)/2-mu/r, xi == -mu/(2*a)] solve(s...

2 years ago | 0

Answered
I am trying to get my function to return two variables to the workspace. It is a very simple function. What am I doing wrong.
If you want both outputs returned, use ouput arguments on the call [m,n] = save_13(1,2) When you call a function without outpu...

2 years ago | 0

Answered
Simulink - output of a block as an another block parameter
Hi Wiktor, Some Simulink blocks have parameters that can be specified either internally or externally, such as the Integrator b...

2 years ago | 0

Answered
Hello, I want to use the LPC function to achieve AR pre-whitening, will the AR coefficient obtained by fftfilt filtering signal is a residual signal?
Hello Yx Y, Based only on reading the lpc example, it would seem that the call to fftfilt should be xest = fftfilt([0 -a(2:end...

2 years ago | 0

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Answered
Using Fourier Series write a MATLAB function to synthesize the wave-form in problem (2-19), Assume A = 4mV. Your function should take n ( # of harmonics ) and produce a plot
Hi Evan First, check your code that defines one period of v(t). It''s probably easier to define v(t) using piecewise syms t T...

2 years ago | 0

Answered
Use of syms, piecewise & conv commands
Hi Ben, First you have to decide if you want to solve the problem for a closed form expression using symbolic tools, like syms ...

2 years ago | 0

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Answered
how to get the correct plot of function sin(N+1)*pi*x^2/sin(pi*x)^2 with different N
Hi Daniel, I think you are correct that the limit of y as x approaches any integer is (N+1)^2. However, all the compuations are...

2 years ago | 0

Answered
Repeat array onto the same row
A=[1,2,3,4] horzcat(A,A) horzcat(A,A(1:floor(numel(A)/2))) % or use ceils depending on how you want to handle the case where ...

2 years ago | 1

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Answered
How to plot FFT?
Hi Sara, The frequency vector needs to be corrected. And for this data it's helpful to subtract out the mean before taking the...

2 years ago | 0

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Answered
Fourier analysis of an spwm signal
Hi Mosharof, Load the data load spwm_one_cycle.mat Plot the differences between time samples. We see that the data is not equ...

2 years ago | 0

Answered
transform the cell 'string' containing strings into a single string
load string.mat who string string_new = join(horzcat(string{:})) Probably not a good idea to have a variable named string, w...

2 years ago | 1

Answered
Add zero padding to fft for accurate estimation
Hi Niusha Here is the first part of the code: Fs = 1e3; t = 0:0.001:1-0.001; x = cos(2*pi*100*t)+sin(2*pi*202.5*t); xdft = ...

2 years ago | 1

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Answered
calculate wrong or "/" work different
Hi pipor The ldivide, .\ and mldivide, \, which is what you're actually using here, for the scalar case are mathematically (tho...

2 years ago | 0

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Answered
How to get the eigenvalues of a transfer funciton matrix
Hi 宇航杨, Considering that question 1 is about the "eigenvalues of a transfer function matrix", I would say that defining what t...

2 years ago | 0