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Im solving for the EOM of a 3 DOF vibrations problem with ode 45 and am having trouble getting the indices to agree when I try to store the equations in my ydot term.
Hi @CARSON KATZ Should be working now. However, it is observed that your stiffness matrix is a Tridiagonal matrix, while your ...

4년 초과 전 | 1

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Tuning PID using GA for multiple plants
Hi @SM For multiobjective optimization, then you should consider using this gamultiobj() command. https://www.mathworks.com/he...

4년 초과 전 | 1

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How to convert SDOF system to MDOF system of Nonlinear Dynamic analysis of a building
@Chaudhary P Patel I'm not a certified Building Dynamicist. But if the equations of motion of a 4-storey building can described...

4년 초과 전 | 0

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Output a plot and a matrix from a function
Hi @Miranda Gabriel Remove the semicolon ";" in this line should produce mymatrix on the Command Window. mymatrix = [locs(:), ...

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I want to plot an implicit equation
Hi @mohd ayaz I tried to plot this way to first visualize how the curve looks like for the positive part of . Qm = linspace(-1...

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How to deal with the time response of first order system?
@Cola, let's correct your Simulink model first. The ODE is given by which can be rearranged into Integrating both sides a...

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Plotting streamlines in an unsteady flow given vector field equation
@Kiat Tsen Lim Since it involves the time dimension, I think you will need to use the quiver3() function. https://www.mathwork...

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How can I create a function with several summations and Kronecker delta symbol in two dimension?
@matlab beginner Have you tried this kroneckerDelta() function? https://www.mathworks.com/help/symbolic/sym.kroneckerdelta.htm...

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Sigma-delta ADC under simscape
@Peter Balazovic Found an example model here. Do you think you can remodel it with the Simscape blocks? https://www.mathworks....

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Create a long rectangular signal with a function handle
@AEW Second opinion! fcn = @(t) (sign(sin(2*pi*t)) + 1)/2; ezplot(fcn, 0, 5)

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ode return NaN :(
Hi @ZH CC The odeToVectorField(eqn) returns this V = ...

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plotting, no graph appears
@Patrick Monst Because you forgot the 'dot' when dividing corresponding elements in the x vector. x = 0:0.01:1; y = (0.5*(1-x...

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given the aeeay of angles an = pi/n,n=2,3,...,9.generete a script that computes cos an and display the results as
@Mrunal Shah If you don't want to use the For loop approach, then try this: n = 2:1:9 A = [n; cos(pi./n)]; fprintf('%s %10s\...

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How do i get a direction field plot?
Hi @Tuân Nguyen Because there are two equilibrium points and , I think it should look like this. [T, P] = meshgrid(0:6e3/14:6...

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How to design PI controllers within Maltab?
Hi @Kyle Ramphal If the result from the PID Tuner app can be admitted as the design solution, then just do so to directly obtai...

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How to solve and graph a second order nonlinear differential equation?
Hi @Parcher Not exactly sure what you are tring to solve, but this worth a try, although it may not be the exact solution that ...

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How to solve an equation with two variables?
@Enver Kocaman The surface has singularities because there are conditions that cause , (division-by-zero). The surface shows a...

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How to add my IQ samples in Simulink as input data?
Hi @raya alhajri You can load data from MAT file into Simulink model using the "From File" Block directly: https://www.mathwor...

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how to collect similar equation and find all of them
@wlat hamad Have you checked if the collect() function works for your case? https://www.mathworks.com/help/symbolic/sym.collec...

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Print value of correlation to a plot displaying two functions
@Loriann Chevalier Perhaps like this? v = corr(y1,y2,'Type','Kendall'); txt = ['Corr = ', num2str(v)]; text(4, 0.5, txt)

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How to do an elimination procedure to represent the solution (matrix)
Can you show the slides and elimination formulas? Otherwise, I think this elimination procedure: A = [1 -2 1; 0 2 -8; ...

4년 초과 전 | 2

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How to plot two vectors at the same time
@Jonas Morgner, Do you mean llke this? v1 = [1 -2 -5 6]; v2 = -100 : .1 : 100; y = polyval(v1, v2); plot(v2, y)

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In the fraction formed by the symbolic variable "s", the coefficient is too large and shows as “Inf”, which cannot separate the numerator and denominator. How to simplify it？
@梦雪 王, Have you tried this? sympref('FloatingPointOutput', true) It should display the expression in floating-point format.

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Using ‘surf’ plot the surface f (x, y) =x(x^2+y^2).
I guess it's here: z=x.*(x.^2 + y.^2);

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Evaluate the expression 𝑦 = 4𝑥3 + 6𝑥2 + 𝑥 + 1 using MATLAB for 𝑥 = 2.
@Muhammad Kashif This is very strictly based how you displayed the equation. x = 2; y = 4*x*3 + 6*x*2 + x + 1 Mostly likel...

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Evaluate (3-4i)(-4+3i) in MATLAB.
@Muhammad Kashif You will need a Alphanumeric Keyboard lets the user type in Latin alphabet, numeric characters, and mathemati...

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Problem with designing MPC
Hi @Marcin Pilzak Because you need to have the MPC object in the Workspace. And this is how you create a basic one: Plant = tf...

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How to find steady state solution of recatti equation
@shahin sharafi You can find the solution for x with the Implicit algebraic Riccati equation solver: [X, K, L] = icare(A_Star,...

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how to save variables in a for loop
@ADNAN KIRAL for x =1:5 y(x) = x*x; end disp(y)

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How to calculate rise time, settling time, and overshoot based on real data measurements
Hi @Konvictus177 The rise time, settling time, and percentage overshoot can directly obtained from measured step response data....

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