已回答
Problem with integration: there is a pole on a contour
In the usual sense, your integral does not exist. But you can compute its principal value: syms z syms t real f = (z^2+3*z+2...

18 days 前 | 2

已回答
Integral2 seems to substitute non-scalar values of variable into integrand. Why?
"integral2" usually calls the function to be integrated with matrices of the same size for t1 and t2 to make the necessary funct...

19 days 前 | 2

| 已接受

已回答
error when using lsqnonlin to function containing fzero function
"K" is a vector because "fraction" is a vector. Thus the "y" you compute in "denaturationfun" is a vector. But "fzero" cannot so...

19 days 前 | 0

| 已接受

已回答
I'm trying to solve jeffry hamel equation using RK4 but it's not giving output as expected.
s = 6; Kn = 0.1; U20 = -1; U2 = fsolve(@(U2)fun_shoot(U2,s,Kn),U20) [Y,Z] = fun_odes(U2,s); plot(Z(:,1),Y) xlabel('U') yl...

19 days 前 | 1

已回答
Generalised solution to a n-order system of equations
Here is my code, that provies a range of answers from a to b, inclusive. Besides that you shouldn't give the same names to the ...

20 days 前 | 0

已回答
Unconstrained minimisation problem with a complicated range
I'll formulate the problem for one property - a generalization to three properties is obvious. I'll assume that each of the 3*N...

22 days 前 | 0

已回答
I'm trying to solve a 2nd order ode with ode45, but have no idea where to start.
After dividing your equation by t, you can just follow the example Solve Nonstiff Equation under https://uk.mathworks.com/hel...

22 days 前 | 0

已回答
How to solve for 1D non homogenous ODE by Finite element method
I usually set A(1,1) = 1, F(1) = 0, A(N+1,N+1) = 1, F(N+1) = 2 and only loop from 2 to N here: %%%% Assembling %%%% for i=1:...

22 days 前 | 0

已回答
How do I change my scalars to fit my normpdf?
xq = 0:100; mu = [25, 50].'; sigma = [5, 10].'; ndist = 1./(sigma*sqrt(2*pi)).*exp(-((xq-mu)./sigma).^2); plot(xq,ndist) g...

23 days 前 | 1

| 已接受

已回答
newton raphson for nonlinear heat equation scheme
Why don't you use "pdepe" ? Ten lines of code maximum, and you are done. To get rid of the error in the above code, replace % ...

23 days 前 | 0

已回答
How to quantify shape similarity between two vectors.
Shift the curves by their means first so that the means of all objects lie in the origin (0). This will remove translational dif...

23 days 前 | 0

已回答
input appears to be a function and variable and exceeds the number of array elements???
You define a string of length 59 named "input". Then you want to use "input" as the MATLAB command to request user input for "ag...

23 days 前 | 0

已回答
How to solve for the maximum or minimum value of a symbolic function
syms Vr theta_r Vse rho gamma positive real syms X_r positive real syms n_t positive real syms Vs positive real syms x y l...

24 days 前 | 0

| 已接受

已回答
An error 'matlabexecutionerror' occurred when i use 'min' in type optim.problemdef.OptimizationExpression
"min" is not a supported operation for optimization variables: https://uk.mathworks.com/help/optim/ug/supported-operations-on-o...

25 days 前 | 0

已回答
How do I make x the subject of this function?
D = 0.05; Y = 0.2170535; f = @(X) Y - (D^2 * acos(1-(2*X/D)) - sqrt(X.*(D-X) .* (D-2*X)) / (pi*D^2)); X = 0:0.001:0.025; plo...

26 days 前 | 0

已回答
Is there a function to create the P-P plot in Matlab, to compare two cumulative distribution functions against each other?
rng default; % for reproducibility a = 0; b = 100; nb = 50; % Create two log-normal distributed random datasets, "x" and "y...

26 days 前 | 1

| 已接受

已回答
give correction to my code for finding value of three variable by newton rapson iteration.
The residual for your initial guess is [191,44,534], the residual for the last column of Z is [75e-9,10e-9,9e-12]. Thus obviousl...

27 days 前 | 0

已回答
Adjacency matrix for ODE45
k = [0,0.1,0.2,0]; reshape(k,2,2) I think you want the reshaped matrix to be reshape(k,2,2).'

28 days 前 | 0

| 已接受

已回答
Numerical solution for the heat equation does not match the exact solution
I cannot believe that the value for alpha has no influence on the solution. So I guess that the exact solution maybe holds for...

28 days 前 | 2

| 已接受

已回答
When i remove the element wise divison of the RLC beacuse RLC is single array it gives me this error Index exceeds the number of array elements. Index must not exceed 1.
You must keep the elementwise division. So Change Kf_LMax = Kf_Max * (RLC / (1 + RLC)); to Kf_LMax = Kf_Max * (RLC ./ (1 + R...

28 days 前 | 0

已回答
Computation of left eigenvectors of polyeig
Hint: If you solve for s and x satisfying (A0.'+s*A1.'+...+s^p*Ap.')*x = 0, using polyeig(A0.',A1.',...,Ap.') , it follows...

29 days 前 | 0

已回答
Setting linear constraints for fmincon,
If real(gamma) and imag(gamma) are vectors of optimization variables, the constraints PS(gamma) - t <= 0; - PS(gamma) - t <...

29 days 前 | 0

已回答
How to plot temperature along a defined line within a 2D temperature field
Does this help ? https://uk.mathworks.com/matlabcentral/answers/52403-plot-solution-of-pde-toolbox-on-a-line-or-submanifold

1 month 前 | 0

| 已接受

已回答
Both function plots start at 1, even though I have time step as t=0:6
Use plot(t,v) plot(t,a) instead of plot(v) plot(a)

1 month 前 | 0

| 已接受

已回答
in this code for finding root by newton raphson method i gave derivative of f in g. instead of giving derivative directly how can i get derivative using any code?
syms x f = x^4-x^2-80; g = jacobian(f); f = matlabFunction(f) g = matlabFunction(g)

1 month 前 | 0

| 已接受

已回答
how to plot two nonlinear functions
x = -10:0.1:10; y = 0:0.1:20; [X,Y] = meshgrid(x,y); Z1 = X.^2+X.*Y-10; Z2 = Y+3*X.*Y.^2-57; % Visualize the two surfaces ...

1 month 前 | 2

已回答
Using symbolic solver, I seem to not be able to get a system of equations that give me a desired answer. Does a solution not exist?
It's the same situation as in your other problem: https://uk.mathworks.com/matlabcentral/answers/2138791-how-can-i-find-a-uniqu...

1 month 前 | 1

已回答
2nd Order Polynomial Coefficient Solving
I don't see R in your regression equation T = a + b*P + c*S + d*S^2 + e*(S*P) + f*(s^2*P) And I assume that "s" means "S". M ...

1 month 前 | 2

| 已接受

已回答
limited integration with respect to x in Simulink
As far as I can see, the integral is of the form integral_{x=0}^{x=L} dx / (a*x+b) for some constant values a and b. The anti...

1 month 前 | 0

已回答
Routh-Hurwitz criterion
Roots of a general polynomial of degree 6 cannot be explicitly computed. You must give numerical values to a,b,c,d,e and f and u...

1 month 前 | 0

| 已接受