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Question
the application decic is different from the predefined syntax
Hi There, In the help center, the syntax of decic is [y0,yp0] = decic(eqs,vars,constraintEqs,t0,y0_est,fixedVars,yp0_est,opti...
2 months ago | 1 answer | 0
1
answerQuestion
define 300 function calls x1(t)---x300(t)
Hi there, I am using ode15s to resolve a DAE system. Since there are 300 variables x1(t)~x300(t) in my case, so I feel it is a...
2 months ago | 3 answers | 0
3
answersQuestion
Can ode15i solve a stiff DAE?
Hi there, Can ode15i solve a stiff DAE? Many THX!
2 months ago | 1 answer | 0
1
answerQuestion
Solve Semilinear DAE System
Hi there, Here I have two questions. Firstly, I want to know, in the file “Solve Semilinear DAE System” of the help center, ...
2 months ago | 1 answer | 0
1
answerQuestion
Any commands about rotation where the unit of the input is radian
Hi there, We find in Matlab, the command rotx denotes a rotation matrix around the x-axis by ang degrees, and the unit of the ...
5 months ago | 2 answers | 0
2
answersQuestion
What codes can be used to retain the decimals before the defined symbolic variable
Hi there, I want to ask, what codes can be used to retain the decimals before the defined symbolic variable? For instance, a s...
5 months ago | 1 answer | 0
1
answerQuestion
how to change the size of the fonts inside the bar graph
Hi there, I am using the bar code to draw a bar graph. So how to change the size of the fonts inside the graph, as shown in th...
5 months ago | 1 answer | 0
1
answerQuestion
Can Simscape Multibody calculate the natural frequencies of the Stewart Platform?
Hi there, as the title says, I want to know if Simscape Multibody can calculate the natural frequencies of the Stewart Platform?...
8 months ago | 0 answers | 0
0
answersQuestion
how to input a function as a parameter of a function
Hi there, Here I have the following recursive code fMin1D to find the local minima of a user-defined function f=fun(x). fun(x...
8 months ago | 2 answers | 0
2
answersQuestion
the computation of the determinant of a matrix composed of block matrices
Hi there, I read the computation of the determinant of a matrix composed of block matrices in this manner from a publicatio...
10 months ago | 0 answers | 0
0
answersQuestion
multiply a matrix into every block matrix in a big matrix
Hi there, Here I want to multiply a matrix H into every block matrix Aij in the matrix A, i.e., Are there any codes can r...
11 months ago | 3 answers | 0
3
answersQuestion
Why the peak values are evidently different under the impulse function to a second order function with zero damping?
Hi there, I am using impulse function to get the impulse response of a second order function where the damping is zero. The co...
12 months ago | 2 answers | 0
2
answerssolve the pendulum problem using ode15s
Hi Shivam, Many thanks for your nice and great help! I am trying to learn your idea in the codes and compare them with mine. H...
1 year ago | 0
Question
solve the pendulum problem using ode15s
Hi guys, The pendulum problem at https://ww2.mathworks.cn/help/symbolic/solve-differential-algebraic-equations.html?s_tid=...
1 year ago | 1 answer | 0
1
answerQuestion
how to correctly use the function "subs"
Hi there, I am using subs to replace some symbols in a symbolic expression Jacobian_mtx_1. The symbols that I want to be repla...
1 year ago | 1 answer | 0
1
answerQuestion
Jacobian matrix in ode15s
Hi everyone, I am using ode15s to solve a set of stiff odes and the final model is developed in the form of where M(t,y) is...
1 year ago | 1 answer | 0
1
answerQuestion
how to format the codes to compute the differential-algebraic equations using ode15s?
Hi guys, I’m trying to use ode15s to solve the dynamic model of a mechanical system in the form of where M is the mass mat...
1 year ago | 1 answer | 0
1
answerQuestion
Can ode45 solve differential-algebraic equations?
Hey everyone, Here I just want to ask as the titile shows, can ode45 solve differential-algebraic equations? the differenti...
1 year ago | 1 answer | 0
1
answerQuestion
the mass matrix and Jacobian matrix in ode15s
Hi there, I have a set of odes in the form where M and K are n*n matrixes q is a n*1 vector containing the generalised coord...
2 years ago | 3 answers | 2
3
answersbuild an augmented PID control model for a DC servo motor in Simulink
Hi Sam, thx for providing the 2 choices. the term augmented means the actuating torques of a motor for a predefined trajectory a...
2 years ago | 0
Question
build an augmented PID control model for a DC servo motor in Simulink
Hi there, I am going to build an augmented PID control model for a DC servo motor in Simulink. The state-space model of the DC...
2 years ago | 2 answers | 1
2
answersQuestion
how to determine the arithematic operations in a code?
Hi there, I want to know: are there any commands in Matlab that can offer us the number of arithematic operations in a code? ...
3 years ago | 1 answer | 0
1
answerQuestion
the length of the time span in ode45
Hi there, I am using ode45 to solve a set of ODEs. Here I want to ask, if the length of the time span is relevant to the accur...
3 years ago | 2 answers | 0
2
answersQuestion
define a jacobian matrix in odeset for ode15s
Hi guys, I am using ode15s to solve my ODEs. It is said that in odeset ( https://au.mathworks.com/help/matlab/ref/odeset.ht...
6 years ago | 0 answers | 0
0
answersQuestion
partial differentating a matrix by a vector
Hi guys, I want to comute , where M is a symbolic matrix , and A is a symbolic vector. Are there any commands in Matl...
6 years ago | 1 answer | 0
1
answerQuestion
Substitution of initial numerical values before odefunction
Hi guys, I am using ode45 to solve a system of ODEs. According to the syntax of ode45, the system is formatted into the form of...
6 years ago | 1 answer | 0
1
answerQuestion
what functionalDerivative returns is a 1*1 symfun, not a vector
Hi guys, I am trying the codes syms u(x) v(x) H = u^2*diff(v,x)+v*diff(u,x,x); D = functionalDerivative(H,[u v]) at http...
6 years ago | 1 answer | 0
1
answerQuestion
Internal error with symbolic engine. Quit and restart MATLAB.
Hi guys, I am using symbolic math toolbox in Matlab 2018b in Win10 64-bit. The problem is Error mupadmex Internal error...
6 years ago | 0 answers | 0
0
answersQuestion
Divide large size matrixes, multiply the small matrixes and sum the results together.
I divided two m x n matrixes A and B into several equal i x j matrices using mat2cell, respectively, and then I want to multipl...
6 years ago | 1 answer | 0
1
answerQuestion
Why the seond arugment in the command jacobian is not a vector of variables?
Hi guys, I am using the code Jacobian in Matlab to symbolically compute the Jacobian matrix for two vectors-A and B. These two ...
6 years ago | 1 answer | 0
