Respondida
Reducing symbolic expressions with assumptions, but NOT simplify?
Hi Aroni, Consider the simple expression syms x f(x) = sin(x)/sqrt(1-cos(x)^2) Simplify simplify(f) If we assume that x is...

más de 2 años hace | 0

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I got error with "error using plot, vectors must be the same length"
Hi Tran, Next time, please copy/paste your code into the Question, which makes it much easier for people to help. Original cod...

más de 2 años hace | 0

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Jumps in signal connections - simulink
Hi Tobias, From the Matlab window: Click Preferences in the Environment ribbon. Select Simulink in the preferences window. C...

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I need to put this block diagram in MATLAB (not in Simulink) and I do not know how to do it
Hi Carlos, Recheck the definiton of s2. Once you have that taken care of, I suggest you proceed with connect.

más de 2 años hace | 0

Respondida
I don't know how to introduce the block (s+6) in simulink
Hi Carlos, One option would be to use block diagram manipulation. For example (there is at least one other approach): a) chang...

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Respondida
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...

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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."

más de 2 años hace | 1

Respondida
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...

más de 2 años hace | 0

Respondida
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...

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

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Pregunta

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...

más de 2 años hace | 1 respuesta | 0

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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,...

más de 2 años hace | 1

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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...

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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...

más de 2 años hace | 1

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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...

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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...

más de 2 años hace | 0

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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...

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Respondida
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 = -...

más de 2 años hace | 1

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Respondida
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); ...

más de 2 años hace | 0

Respondida
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; ...

más de 2 años hace | 0

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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 ...

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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...

más de 2 años hace | 0

Respondida
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...

más de 2 años hace | 0

Respondida
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...

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Respondida
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...

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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...

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Respondida
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 ...

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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...

más de 2 años hace | 0

Respondida
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 ...

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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...

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