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Extract data from a bode plot.
s = tf('s'); HLM = ((2.524e-06)*s^3 + 37.11*s^2 + 37.6*s)/((2.704e-07)*s^3 + 1.767*s^2 + 41.36*s + 80); Finf = 1e-3; %Hz Fs...

4 years ago | 1

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substract an element from previous element in a matrix
The diff function seems to be appropriate.

4 years ago | 0

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Plot level curves and projections as a contour
I am not certain what result you want. The contour3 function or surfc could be an option — N1 = 10; N2 = 10; x1 = linspac...

4 years ago | 0

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Answered
ODE45 needs column vector from anonymous function
Do element-wise division: yprime = @(x,y) ((-x.*y)./(sqrt(6-(y.^2)))); ↑ and it does — options = o...

4 years ago | 0

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Error using mesh, Z must be a matrix, not a scalar or vector.
In figure(3) the code needs to be: [tt,xx]=meshgrid(t1,x); mesh(xx,tt,T) The problem was using ‘t’ instead of ‘t1’ and using...

4 years ago | 0

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Answered
sub2ind - understanding question
The graphic explanation in Examples explains how MATLAB stores and addresses matrices using both linear indexing and subscripts....

4 years ago | 0

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How to plot this function with the interval of [-2,2]?
Use fimplicit — syms x f(x) = x + 1 - 2*sin(pi*x) figure fimplicit(f, [-2 2]) grid xlabel('x') .

4 years ago | 0

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Find zero crossings in each row of a matrix (321 x 123 double)
t = linspace(0, 5, 123); % Create Data A = sin(randi(9,5,1)*2*pi*t/5 + 2*pi*randi(9,5,1)) ...

4 years ago | 0

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Answered
How to plot this equation?
syms t y f(t,y) = 2*y/t - (t*y)^2 figure fsurf(f, [-5 5 -5 5]) xlabel('t') ylabel('y') zlabel('f(t,y)') It is nec...

4 years ago | 0

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Plotting phase space for 2nd order nonlinear ODE
I am not certain what you want to plot for the phase plot. This calculates and plots as a funciton of and also calculates t...

4 years ago | 1

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Answered
How to plot graph?
Try this — Ax = gca; Ax.YAxis.Exponent = 0; I checked, and this will work in R2018a according to the R2018a NumericRuler Pro...

4 years ago | 0

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Answered
How do i plot the phase of fft values in a matrix?
Use the angle function to calculate the phase from the complex fft result. The unwrap function may also be helpful, depending o...

4 years ago | 1

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How to optimize an objective function with repect to two variables using fmincon?
The general approach to maximising a function is to negate it so the minimum that the optimisation functions find is actually th...

4 years ago | 1

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Answered
Find boundary of curve-forming points
This is not perfect, however it is the best I can do with these data — LD = load('data.mat'); beta = LD.beta; r = abs(beta...

4 years ago | 0

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Converting discrete signal to frequency domain
The fft calculation an plotting is straightforward. (You can also use the pspectrum function and others.) Fs = 100; Fn = Fs...

4 years ago | 0

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Answered
Matlab 2015a Script to solve the equation w=-tan(0.8*w)
Use vpasolve with an initial value (or range of values as described in Specify Ranges of Solutions) — syms w EQ = w + tan (0....

4 years ago | 0

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Please explain this code about differential equations.
They refer to the function values returned by ode45 (in this code). y(1) is y(2) is y(3) is That can easily be inferre...

4 years ago | 0

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divide a string every 15 characters
Try this — A = ["+6.64430238e+00+1.14987825e-02-4.68099585e-06+9.62334222e-10-8.24360065e-14"]; B = string(reshape(char(A),15...

4 years ago | 1

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Answered
Trigonometric non linear equation
Try something like this — theta=30; k=360; h=0.5555; F = @(h) ((cosd(theta).*(sind(k*h).^2)) - (2*(sind(k.*h.*cosd(theta))....

4 years ago | 0

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Answered
How do I hyphen a word using LaTex?
It appears to work as written — figure xlabel("multi-disciplinary", 'Interpreter','latex') Do you want a different result? ...

4 years ago | 0

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Arrays have incompatible sizes for firpm() function.
The ‘frequency’ and ‘response’ vectors must be the same lengths, and they must have even numbers of elements (according to the d...

4 years ago | 0

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Answered
Fitting a curve (not a surface) for set of 3d points
I have no idea what model you want to fit to the data. This does a linear regression — A = [-27.9887180593615 -1340.7554656...

4 years ago | 0

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Answered
Using plot with dates stored in a cell array
I get a different result — i = 1; dates{i} = '1/22/20'; dtv = datetime(dates{i}, 'InputFormat','MM/dd/yy') That appears to ...

4 years ago | 0

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How do I save multiple PCA results in a cell array? Error: Brace indexing not supported
I am not certain what the problem is. This runs without error for me, and produces the appropriate result — LD = load('pre...

4 years ago | 0

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Answered
Needing help using ode15s to solve an equation.
I find it easiest to let the Symbolic Math Toolbox do all the heavy lifting — syms C(t) C_in C_0 Q_in Q_out t V_0 Y DE = (V_...

4 years ago | 1

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Answered
help plot of function using handle
Call ‘G’ with its argument — b1 =1 b2 =2 b3 =3 b4 = 4 % Replace Missing Value %------...

4 years ago | 1

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Answered
Numerical Fourier transforms of matrix?
I have no idea what you want. I would not suggest integrating the individual sine and cosone coefficients using numerical integ...

4 years ago | 0

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Answered
Can I use an anonymous function as an input to a regular function
I am not certain what you are doing. Try this — anon = @(x) x+3; y = hello(3,anon) function y = hello(input1,fcn) ...

4 years ago | 0

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How do I keep f as a variable in a state space model, as f is supposed to be the input variable??
Since ‘f’ is only defined in ‘B_motor’ simply create an anonymous function from it, and then from ‘motor_ss’ (to keep with the e...

4 years ago | 0

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Answered
Using splitapply to add a column to a table
I am not certain what result you want. Try this — Tickers = ["AAPL"; "AAPL"; "AAPL"; "MSFT"; "MSFT"; "MSFT"]; MonthlyRetur...

4 years ago | 0

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