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Error Using Optimization with Integer Variables and Non-linear Constraints
Replace prob.Constraints.cons1 = norm_h==norm(cat(1,h(end:-1:2),h),1); prob.Objective = norm_h; by %prob.Constraints.cons1 =...
19 minutes ago | 0
A naive question regarding MATLABs definition of parabolic/elliptical PDEs (pdepe)
https://en.wikipedia.org/wiki/Elliptic_partial_differential_equation Second-order linear partial differential equations (PDEs) ...
6 hours ago | 0
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How to find the point that resides on a contour that is closest to a known point?
format long Z = peaks(50)/10; surf(Z) obj = @(x,y)(x-16.35)^2+(y-0.05)^2; nonlcon = @(z)deal([],interp2(0:49,0:49,Z,z(1),z(2...
6 hours ago | 0
The standard implementation of ldl factorization in Matlab does not work correctly
From the documentation: [L,D] = ldl(A) factorizes full matrix A into a permuted lower triangular matrix L and a block ...
7 hours ago | 0
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How to optimize the run time in my optimization problem.
I don't see anything obviously wrong in your coding - except for the last term in MTE_i which should be (TotalProduct(6)-Exper...
11 hours ago | 0
I'm getting the 'Not enough input arguments' error event though I am pretty sure I am giving all the arguments needed at all times
format long [x,it] = NewtonSystemSolver(5, 10^-12, 100, [5e4,0,0,0,5e4].', @Slammer1, @Slammer1Jacobian) Slammer1(x) function...
1 day ago | 1
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ode15s giving integration tolerance error and loop stopping at zeroth iteration
The evaluation of the variable "ros" for your vector of initial conditions y0est gives NaN. The reason is that you start with mL...
1 day ago | 0
Multiple iterations for plotting
Maybe you mean h= 0.5; b = 0.5; d1= 0.474; d2= 0.035; As= 2512*10^-6; Asc= 2512*10^-6; fy= 400*10^6; Es= 200*10^9; fc...
2 days ago | 0
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There is a matrix operation, A*B=c. would there be a way to find a specific elemetn in C and call out variables that were involved in the calculation of the specific element
Since you set C = A.*B and not C = A*B, the elements that influence the value at position (i,j) in C are the elements (i,j) in A...
2 days ago | 0
Set up a gradient descent algorithm for a multivariable economic dispatch problem
There must be something wrong in the computation of t in your code. For t=1, the usual gradient descent works: clc; clear; sym...
3 days ago | 0
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Setting Boundary Conditions & Using bvp4c
xcastle = 20; % x-coordinate of target v0 = 20; % Prescribed (...
3 days ago | 0
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Solving ODE system with a constraint/boundary condition
p_A + p_B should remain constant since dp_A/dz + dp_B/dz = 0 according to your equations. But this is not the case for p_A + p_...
3 days ago | 0
How do I write time dependent variables in my equations of motion?
Integrate from 0 to 5 with F = 0, Vin = 280. Restart with the solution obtained and integrate from 5 to 10 with F = -10, Vin = ...
4 days ago | 0
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What is the mathematical form called for PDEs used with the MATLAB function pdepe?
Would this be considered an elliptical/parabolic PDE in conservative form? No. "Conservative" usually refers to the first spati...
4 days ago | 1
| accepted
Energy optimization robot paths
toolPositionHome = T_home(1:3,4); % Define a Set of Waypoints Based on the Tool Position waypoints = toolPositionHome + ... ...
4 days ago | 0
I'm having an issue defining the initial conditions for solving a system of differential equations
You have two second-order ODEs for th and w. Thus you need 4 boundary conditions (not 6) that can be prescribed for w, dw/dx, ...
5 days ago | 1
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Received this error, not sure how to fix
Maybe you mean for ni=1:j instead of for ni=1+j If not, you try to access N(7) which does not exist.
5 days ago | 0
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Vector Length Error when Calling Function
You overwrite MATLAB's intrinsic "length" in the lines length = data(2:end,2) length = cell2mat(length)
5 days ago | 0
How to match matrix elements for a condition?
If A becomes larger, this brute-force way of solving will become intractable. A = [15 25 36 17 48 59 31 64 18 21 97 84 31 64 15...
5 days ago | 0
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How do I use my data set in an equation?
Say lm is 2x6, e.g. lb = [1 2 3 4 5 6] lm = [7 8 9 10 11 12;13 14 15 16 17 18] What would you like to compute ? [log(1/7) lo...
5 days ago | 0
error >> Matrix dimensions must agree. How to fix
z doesn't need to be prescribed in array form because you integrate with respect to z. Here I assume that the integration variab...
5 days ago | 0
How to get the formal expression of the expansion of power of a polynomial with symbolic calculation
syms x n = 10; k = 2; a = str2sym(compose("a" + (0:n-1))) f = x^n + sum(a.*x.^(0:n-1)) g = f^k; coefficients = coeffs(coll...
5 days ago | 0
Using MATLAB to do Numeric Calculus
Your code is correct. Here is a simpler way to define s and v. Just substitute tcrash by tmax. tcrash = 1596.2/(2*4.905)+sqrt...
6 days ago | 0
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probability that values are belong to an interval
It depends on how x is distributed. If f is the (continuous) probability density function for x, you get the probability p as ...
6 days ago | 0
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How to use ode15s to solve a stiff ode with mass?
tf = 200; x0 = [0 0 0 0 2500 0 0.8 0 50 50 50 50 5]; M = zeros(13,13); M(1,1) = 1; M(2,2) = 1; M(3,3) = 1; M(4,4) = 1; ...
7 days ago | 1
I am getting error:Warning: Failure at t=0.000000e+00. Unable to meet integration tolerances without reducing the step size below the smallest value allowed (7.905050e-323)
If you remove the semicolon behind %% mass balances dy_dz=[1/u*(-r3) 1/u*(...
7 days ago | 0
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vectorized operations on symbolic functions
rng("default") syms x1 x2 x3; % symbolic variables y = x1^3/3 + x2^2/2 - x3; % symbolic function y X = rand(500,3) % each row...
7 days ago | 0
Dot product does not work for symbolic vectors
Since you cannot assume functions to be real-valued, you must use dot(r,r) - (r_x*r_x' + r_y*r_y' + r_z*r_z' ) instead of dot...
7 days ago | 1
NaN in converting a sym to double
exp(lambda1*c0*eta0) and exp(lambda3*c0*eta0) evaluate to Infinity for s big enough (s slightly bigger than 0 already suffice...
8 days ago | 0
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How to plot a three variable complex function
You cannot plot the complete result of a function that depends on three independent variables. But you can plot it on slices (i...
8 days ago | 0
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