why am I getting this difference in the plotting?
Your choice of a and b must be different from the values you posted: % First method a = 3; b = 0.9; x0 = 0.9; y0 = 1-x0; f...

ungefär en månad ago | 0

| accepted

help solving for Delx
qf = 38.6; T1 = 25; e=0.95; s=5.67e-8; K=300; t=0.12; w=3; fun = @(T,delx) [T(1)-T1; qf - K*w*t/delx*(T(1)-T(2)) - 2...

ungefär en månad ago | 0

| accepted

problem doing implicit plotting
Remove the dot at the end of the expression x.*y.

ungefär en månad ago | 1

Why i am getting blank graph? Can someone help me to figure out error in my code.
is_exam3() function is_exam3 L=0.01; M=0; q=0.5; a=0.03; Pr=0.1; b=0.2; p=0.1; m=0.1; e=1.0; H=0.1; E=0.1; o=0...

ungefär en månad ago | 0

How to solve the following PDE equation
I think you mean x(s,0) = 10 instead of x(s,t) = 10, don't you ? The easiest way to solve the equation is to discretize the exp...

ungefär en månad ago | 0

| accepted

Matrix is singular to working precision.
Obviously, your matrix is the zero matrix. Most probably the reason is that you don't assign values to K in the loop K(2*cnt-1...

ungefär en månad ago | 0

Solving unknown matrics to the power 20
p = [1 0 0 0 0 0 0]; R = [9; 8; 7; 6; 5; 4; 3]; CR = [0.45]; n = 20; TPM = diag([(CR/(p(1)*R(1)))^(1/n),zeros(1,6)]); p*TPM...

ungefär en månad ago | 0

Error using pdepe: Spatial discretization has failed. Discretization supports only parabolic and elliptic equations, with flux term involving spatial derivative
"pdepe" is a solver for parabolic-elliptic equations. Thus all equations should have a second-order derivative term in space and...

ungefär en månad ago | 0

| accepted

In matlab, although my matrix is ​​full rank, the solution is still incorrect.Ax=b,A(10000*10000),x、b(10000*1)
The condition number of your matrix D is around 1e11 (see above). This is near to singular. I think you cannot expect a better r...

ungefär en månad ago | 1

Too many input arguments error
Your function xa and xn have three inputs (n,x,g), not two (n,g). Thus x_func = @(n, g) (xa(n, g)/xn(n, g))^(1/3); % Example T...

ungefär en månad ago | 0

Why Does My Custom SA not Work for Mixed-integer Problem?
This is the problem structure of "simulannealbnd". I cannot find "IntVars". problem — Problem structure structure Problem st...

ungefär en månad ago | 0

| accepted

solving symbolic equations with partial derivatives
syms Cf(zf,zr) cf(z,theta) L zref = zf; thetaref = (zf - zr)/L; dCfdzf = diff(cf,z) * diff(zref,zf) + diff(cf,theta)*diff(the...

ungefär en månad ago | 0

Calculations with distributions of variables only
Look up "Monte-Carlo-Simulation".

ungefär en månad ago | 0

Time-dependent dynamic problem with nonlinear stiffness using ode45
You solve for U and Udot - thus you get values for U and Udot from ode45. Simply compute the matrix K(U) with these values and p...

ungefär en månad ago | 0

Error: Data must be numeric, datetime, duration, categorical, or an array convertible to double.
% Declaring Theta and Phi Variables theta = 0:0.1:pi/2; % Phi Values phi_E_Plane = 0; phi_H_Plane = pi/2; % Declaring x...

ungefär en månad ago | 0

How to solve this differential equation? I got ''Warning: Unable to find symbolic solution.'' error. What am I missing ?
You don't miss anything - your equation is just too complicated to have an analytical solution. You will have to use a numerica...

ungefär en månad ago | 0

| accepted

fsolve error: Unable to perform assignment because the indices on the left side are not compatible with the size of the right side.
Include the line size((2.*x_SW(2).*dfreq_SW_vr.*w(1).*g2) + ((1./4).*x_SW(1).*nu).*(f1b.*zet_0_0 + f2b.*eta_0_0).*g1.*cos(gamm...

ungefär en månad ago | 0

Hi All. Just wondering why answer to (i) is not 4.9e+4. an why answer to (iii) is not (9x)/2 or 4.5 x. Many thanks. Brian
For (iii), use syms x real instead of syms x

ungefär en månad ago | 1

Overwriting the maximum function evaluation
You didn't include the structure "optim_lsq" in the call to lsqcurvefit.

ungefär en månad ago | 0

Operands to the logical AND (&&) and OR (||) operators must be convertible to logical scalar values. Use the ANY or ALL functions to reduce operands to logical scalar values.
if all(abs(grad_g1_val) < tol) && subs(g1, {x1, x2, x3}, x') <= 0 activeSet = [activeSet, 1]; % Constraint 1 is ac...

ungefär en månad ago | 0

| accepted

ODE45 and dsolve result difference
dydx(2)=2-2*y(2)-8*x; instead of dydx(2)=2-2*y(2)-8*y(1);

ungefär en månad ago | 1

| accepted

Intersection condition between two ellipses
I'm surprised that we get a division by zero by the below solution method if the aspect ratio of the two ellipses is equal. Bu...

ungefär en månad ago | 0

Arrayfun with Extra Parameters
Test3 = arrayfun(f,a,b) instead of Test3 = arrayfun(@f,a,b)

ungefär en månad ago | 0

| accepted

Extract the indices based on the minimum absolute value
Maybe you mean %define the number of random numbers n = 10; %define the min and max ranges of random values stvar = [0 4]...

ungefär en månad ago | 0

How to fit a distribution whose parameters depend on other parameters?
In this case, you must assume a parametric expression for T(z) as well (e.g. T(z) = a + b*z) and add a and b to the parameters t...

ungefär en månad ago | 0

Solve and plot system in x and y with varying constants e and t
basically i would like to obtain on the same graph different curves in x and y for a fixed number of combinations of e and t. I...

ungefär en månad ago | 0

| accepted

sol2 = bvp4c(@bvpexam2, @bcexam2, sol);
Ibrardual() function Ibrardual Nt=0.5; Nb=0.5; Le=2; Pr=1; Alpha=[-0.2138;-0.4]; s=1; A=1; %% solution in structure form %...

ungefär en månad ago | 0

| accepted