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Pregunta
How Does Symbolic Math Toolbox Define Differentiation of a Complex Function?
The doc page diff - Differentiate symbolic expression or function - MATLAB is essentially silent on how diff handles differentia...
alrededor de 16 horas hace | 0 respuestas | 0
0
respuestasPregunta
Why Does sym(cell) Not Return a Cell?
As far as I can tell, there is no documented behavior for calling sym with single input that's a cell. Nevertheless, if doing so...
5 días hace | 1 respuesta | 0
1
respuestaPregunta
Can Same Commands in Debugger and Command Window Exhibit Different Behavior?
I was debugging what I'm pretty sure is a bug (or at least an inconsistency) in @doc:subs and came across a behavior that I don'...
5 días hace | 1 respuesta | 1
1
respuestahow to implement a non-causal system?
In general (but not always), causality of a linear, time invariant (LTI) system cannot be determined by inspection of the diffe...
13 días hace | 0
Pregunta
How Can Short-Circuiting Logical Operators &&, II be Overloaded in a Classdef?
Logical and - Find logical AND - MATLAB and logical or - Find logical OR - MATLAB can be overloaded for classes with functions "...
19 días hace | 1 respuesta | 1
1
respuestaanonymous function with rng call inside
t = 2*(rand(1,1000)-0.5)*100; figure plot(t,f(t,10),'b.',t,f(t,10),'r.') function y = f(t,interval) tinterval = ceil(t/in...
20 días hace | 0
Find symbolic solution with intermediate variables of a cubic equation
Check the "AbbreviateOutput" setting of sympref
21 días hace | 0
| aceptada
Importing space-delimited files where there are spaces in data fields
T = readtable('timing_log.96278.txt',NumHeaderLines=4,VariableNamesLine=3); T(end-1:end,:) = []; T.description = strtrim(strin...
22 días hace | 1
Two sided laplace transform
No, there is not, at least not directly. However, the two-sided Laplace transform of f(t) can be developed by expressing f(t) ...
27 días hace | 0
Pregunta
Is There a Way to Control Which Folders are Stored in the Drop Down History?
I have a workflow on Linux that needs to do lots of file i/o that goes something like this: 1. Store the originating folder wit...
alrededor de 2 meses hace | 1 respuesta | 0
1
respuestaPossibility of Using a State-Space Actuator in a Robot Created with Simscape Multibody
Without more info ... I'm pretty sure the answer is yes. The output of the State Space block can be sent into the Simscape Multi...
alrededor de 2 meses hace | 0
Why I do not see the correct transfer function
Hi Zeyuan, Is G1 defined correctly? If it is, or if stil having trouble after correcting it, it would be easier to help with a...
alrededor de 2 meses hace | 0
| aceptada
Pregunta
Why is vecnorm So Slow?
Why is vecnorm so much slower than the raw calculation and why does such difference increase as the input gets larger. I can see...
2 meses hace | 1 respuesta | 0
1
respuestaPregunta
Does solve Return an Appropriate Solution for a System of Rational Equations?
Consider a system of equations with LHS being rational functions in two variables. syms x y g = (x-1)/(y-2) == 0; h = (y-2)/(...
2 meses hace | 0 respuestas | 2
0
respuestasHelp using the toeplitz function
"-2 going to down the main diagonal and then 1 in the upper dioagonal and 1 in the lower diagonal." That's symmetric so only on...
3 meses hace | 1
List all memoized function caches
mf1 = memoize(@func1); mf2 = memoize(@func2); for ii = 1:10,mf1(ii);mf2(ii);end clear mf1 mf2 mfs = struct(matlab.lang.inter...
3 meses hace | 1
| aceptada
List all memoized function caches
Hi Matt, Is evalin acceptable? clearvars clearAllMemoizedCaches; mf1a = memoize(@func1); mf1b = memoize(@func1); mf2 = me...
3 meses hace | 0
Make memoized function calls recognize equivalent input sequences (and so avoid redundant cache entries)
That's interesting and seems to suggest that the input argument list is saved off to some data structure (like a cell array?) be...
3 meses hace | 1
| aceptada
Pregunta
What's the Best Way to Convert a .mat File from -v4 format to -v7 Format?
Is there a better way than reading all of the data from the -v4 .mat file and then saving all of the data to a -v7? data = load...
3 meses hace | 1 respuesta | 0
1
respuestaInnerjoin when a table contains user-defined objects
Hi Matt, I think the class defintion has to change so that the myclass constructor can accept zero arguments. I believe that w...
3 meses hace | 0
| aceptada
Integral from a function that has a singularity
According to quadgk, for an integrand with a singularity we should "split the interval and add the results of separate integrati...
3 meses hace | 0
Pregunta
Does Matlab Take Full Advantage of the BLAS Routines?
It's my understanding that Matlab uses BLAS routines under the hood for many matrix algebra operations. Is that correct? If so,...
3 meses hace | 1 respuesta | 0
1
respuestaMemoize an anonymous function with externally scoped variables
[Matt J added:] "... MATLAB® returns the associated cached output values if the following conditions are true. The input argum...
4 meses hace | 1
| aceptada
Solution of ODE with Symbolic Math Toolbox.
Use rewrite to get the solution in terms of heaviside. syms("t", "positive") syms("T_1", "k_p", "positive") syms("u(t)", "y(t...
5 meses hace | 0
| aceptada
BodePlot: Plotting straight lines on the Mag and Phase plots. Can access the phase plot, to do so, but not the mag plot
Looks like the mag and phase axes were reversed, specify the axis input to the line commands. The NextPlot commands aren't neede...
5 meses hace | 0
| aceptada
chebyshev II BPF magnitude response is not equal to 1 in the passband - incorrect magnitude response when using freqz(b,a)
Hi Mohamad, When using the two-output form of zp2sos the gain, g, must be applied to the output of freqz to get the correct fre...
5 meses hace | 1
How to approach iterative data reading?
Hi Eric, Use logical indexing. time = [rand(1, 5000)]; accel = [rand(1,5000)]; gcamp = [rand(1,5000)]; sd = std(accel); th...
5 meses hace | 0
| aceptada
how to use mussv with negative frequency?
mussv appears to run w/o error for a complex-valued state space model and does extend its analysis to negative frequencies. Alt...
5 meses hace | 1
Discussion
550,000 Questions on Answers
The 550,000th question has been asked on Answers. How to build a BESS model phasor system - MATLAB Answers - MATLAB Central
6 meses hace | 0
Pregunta
Why Does polyval Return Zero When the Coefficients are Empty?
polyval([],1) polyval(ones(1,0),1) Do those results follow from a mathematical justification or are they arbitrarily specified...
6 meses hace | 3 respuestas | 1
