Answered
Gaps in contour plot using custom secant method (when solving for two-plume merger)
The equation for rho is a polynomial of degree 4. The MATLAB function "roots" solves for the four zeros of this equation. I ...

10 months ago | 0

| accepted

Answered
May I ask everyone to help me solve this problem
I'm not sure, but if you want to integrate the normal distribution, use "mvncdf". integral2 can be very inaccurate when integrat...

10 months ago | 0

Answered
Clustering using Gower's Distance
To use a distance that is not implemented, you have to define a function handle. Since I guess that GowerDst is not a function h...

10 months ago | 0

Answered
Why do I get the wrong values for enthalpy on the P-h diagram block in Simulink/Simscape?
The reference enthalpy for R-134a is often given for the saturated liquid at -40°C, with a value of 148.4 kJ/kg. If you look at ...

10 months ago | 1

| accepted

Answered
Problems plotting an implicit solution to a differential equation
For more complicated cases where an explicit solution cannot be found: syms y(x) eqn = diff(y) == (2*x+y+2)/(2*x+y-4); soluti...

10 months ago | 0

| accepted

Answered
fft function seemingly not evaluating correctly
syms x f = 1/(2*sym(pi))*exp(-0.5*x^2); fourier(f) The Gaussian Pulse example under https://uk.mathworks.com/help/matlab/ref...

10 months ago | 0

Answered
mvncdf seems to be violating the additive property of integrals
The complete IR^2 is made up of four quarter zones, not two. Sketch the quarter zones over which you integrate to understand wha...

10 months ago | 1

| accepted

Answered
how to evaluate the integral of the expression involving bessel functions.
l = 0; R_I = 2; N = 3; P = 3; k = [0.28,0.2,0.1,0.05]; %[k0,k1,k2,k3] e = [0.3,0.9,0.7]; %[e1,e2,e3] d = [0.1,0....

10 months ago | 0

Answered
I have 9 coupled nonlinear ordinary differential equations. and i have to convert it in to state space form. here i have 9 state variable including theta.
Write your system as M(U,U')*U'' = f(U,U') with a (9x9) matrix M. Then you can use ode15s to solve the system V' = W ...

10 months ago | 0

| accepted

Answered
Solving boundary value problem
I think this is what you want. But although there are four boundary conditions for four free parameters, they do not suffice to...

10 months ago | 2

Answered
Wierd wiggle in plot of symbolic expression
Using IB0(t) = vpaintegral(@(tau)B(tau,0),tau,0,t,'Waypoints',[1]); instead of IB0(t) = int(B(tau,0),tau,0,t); makes the wi...

10 months ago | 4

| accepted

Answered
How to Apply Multiple BC Types (Dirichlet, Robin, Neumann) on a Single 3D Face?
gd = [3 4 -0.5 0.5 0.5 -0.5 -0.5 -0.5 0.5 0.5; 3 4 0.5 1.5 1.5 0.5 -0.5 -0.5 0.5 0.5; 3 4 -1.5 -0.5 -0.5 -1.5 -0.5...

10 months ago | 1

| accepted

Answered
Solving a system of a changing number of nonlinear equations
The solver doesn't converge. You should check parameters and equations. load 'AppxSteadyStateTestInput.mat' fun = @(x)test1(x,...

10 months ago | 0

Answered
How to Apply Multiple BC Types (Dirichlet, Robin, Neumann) on a Single 3D Face?
Here is one way to create the geometry such that you can set different boundary conditions on different faces at the top. If yo...

10 months ago | 0

Answered
Cap Maximum ODE solve time
Josh Meyer's answer shows you one possible way to do this: https://uk.mathworks.com/matlabcentral/answers/511547-possibility-to...

10 months ago | 1

Answered
Please help me to plot surface figure. I want to draw this attached photo 2 dimension of (NG,etta) in 3 dimension as (NG, R,etta)
proj() function sol= proj clc;clf;clear; global n; global s %Relation of base fluid rhof=997.1*10^-3;kf=0.613*10^5;cpf=4...

10 months ago | 0

| accepted

Answered
How do I delete specific parts of a graph
The arclength of a function will always be increasing. Thus your graph cannot be the arclength of a function. clear, clc syms ...

10 months ago | 1

| accepted

Answered
How can I calculate the power spectral density of a gaussian pulse?
Here is another one: https://uk.mathworks.com/matlabcentral/answers/169376-power-spectral-density-two-approaches

10 months ago | 1

| accepted

Answered
Please help me. I want to run this attached simple code
Use function dy= projfun(x,y) and replace m by x in the function. Further, b5 and a are undefined. Further, you miss a multi...

10 months ago | 0

| accepted

Answered
Positive Roots of bessel functions.
As I understand your question, given l, you try to find 0 < x_1 < x_2 < x_3 < ... < x_m that makes J_l(x_i) = 0 for i = 1,2,......

10 months ago | 0

Answered
Can we find derivative of bessel functions in matlab directly?
You can compute it symbolically first and insert the result as a numerical expression in your code. syms x diff(besselj(0,x),x...

10 months ago | 0

| accepted

Answered
Problem with fit Model with odd order polynomial
In the case of the polynomial of degree 5, the design matrix is rank-deficient: T = readmatrix("DistortionTab...

10 months ago | 0

Answered
Doubt of Linear Algebra self-paced course
Why don't you copy it from the course and use it in future ? Or use "quiver" resp. "quiver3": figure(1) quiver([0,0] ,[0,0], ...

10 months ago | 0

| accepted

Answered
How to use arrayfun with built-in Matlab functions where the variable parameter is passed with 'Name', 'Value'?
x=[ 6.9100 6.1800 6.0500 5.7900 5.5000 5.2400 4.9800 4.6800 4.5100 4.6191 5.2582 5.9801 6...

10 months ago | 0

| accepted

Answered
MNPBEM Error - Issue with dot product in tripolygon file
The variable "edge" does not seem to have a substructure with name "pos". E.g. s = 2; s.pos will give this error message. ...

10 months ago | 0

Answered
Please help me to run this code
Note that you plot y(1,:), not y(6,:). If I were you, I'd simply use "plot" to compare the three curves depending on Gr. proj(...

10 months ago | 0

| accepted

Answered
Convert a decimal approximation to exact value symbolically
Here, you need the fact that y2-y1 is an odd function: syms x y y1=sin(pi*x/2); y2=x; x1=-1; x2=1; A=2*int(y2-y1,x,x1,0)

11 months ago | 0

| accepted

Answered
solving system of equations
This works, but I doubt it will work in all possible cases. % Tolerance for convergence check tol = 1e-8; max_iter = 100; it...

11 months ago | 0

Answered
first order PDE , verification of one solution
You shouldn't waste your time here with symbolic manipulations. What is important is that solutions f(x,y) of the PDE df/dx + ...

11 months ago | 0

Answered
Interp1 is not working after applying unique because of rounding off
https://uk.mathworks.com/help/matlab/ref/uniquetol.html

11 months ago | 0

| accepted