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How do you compute the product of a matrix and each column of another matrix without a for loop in MATLAB, or is this just not possible?
y = C*x

19 dagen ago | 0

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Answered
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...

19 dagen ago | 0

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

19 dagen ago | 1

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Answered
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...

19 dagen ago | 0

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

19 dagen ago | 0

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Answered
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]...

19 dagen ago | 0

Answered
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...

20 dagen ago | 0

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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...

21 dagen ago | 0

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Answered
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 %...

21 dagen ago | 0

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Answered
What is the most computationally efficient factorization of a matrix A?
Prove that the matrix is positive definite and count the number of FLOPs of Cholesky compared to the other factorizations. Sect...

22 dagen ago | 0

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what is the error here?
The error is that the parameter "S" is not an input to function "odeBVP" and thus undefined in f =[y(2);y(3);(1/3)*D1*((y(2)^2...

23 dagen ago | 0

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Runge kutta giving complex numbers
It doesn't make sense to use such discontinuous input data for the solution of a differential equation. Solving a differential ...

25 dagen ago | 0

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How does Matlabs Symbolic Math Toolbox always finds an analytical eigendecomposition for arbitrary polynomial matrices?
For me this begs the question, is the eigenvalue polynomial from eig(...) truly analytic? What do you mean for a polynomial to ...

25 dagen ago | 1

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Answered
Want to understand how to implement in matlab the following differential equation?
If you know P1 over time, you don't have a differential equation, but simply an algebraic relation to determine Q: Q = (P1-P2)/...

25 dagen ago | 0

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Coding the Thomas algorithm for a heat and mass transfer problem
When I run the function, I get: Not enough input arguments. Error in solvePDEs (line 27) y(n) = linspace(y_span(1), y_s...

26 dagen ago | 1

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Answered
Mapreduce with tall array in matrix multiplication
Would this work for you ? B = ones(2,3); A = tall(ones(200,2)); values = A*B; gather(values)

26 dagen ago | 0

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Does pdepe accept 'Vectorized', 'on' as an option? If so, what does it do?
If you look into the documentation for "pdepe", you will find that the "Vectorized" option cannot be chosen: Cited from the doc...

27 dagen ago | 0

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Answered
Complex Integration in MATLAB with symbolic integration limits
Does this help ? Note that no distiction is made about the R-value. But you should keep in mind that the answer is incorrect i...

27 dagen ago | 0

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how i can change column vector into row vector??
Simply converting a row vector into a column vector needs the usual transpose operator which is .' You used only ' with is conju...

29 dagen ago | 0

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Does cummax works in a sde solver?
My question is: does here cummax works on all previous values of X(2)-X(1), or it takes it as a scalar at every iteration? It t...

29 dagen ago | 0

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H have a error in FDM.
F(i+1) = (F(i) + F(i+2))/2 -H(i)*(h/2)*(F(i+1)-F(i)) +(h^2)*(G(i)^2) - (h^2)*(F(i)^2) + (h^2)*(S/2)*((((i*h)+1)/2)*((F(i+...

30 dagen ago | 0

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Answered
Error using matlab.internal.math.interp1 Input coordinates must be real.
For some reason, the k suggested by "fminbnd" becomes complex-valued so that interpolation in function "valfunsto" is no longer ...

30 dagen ago | 0

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Answered
Computing Partial derivates of anonymous functions comprised of sum of standard functions
Your code works for me. Maybe you have a MATLAB version where the second argument to "diff" is only interpreted as the order of ...

ongeveer een maand ago | 0

Answered
Computing Partial derivates of anonymous functions comprised of sum of standard functions
Stay numerical in your computation and approximate the gradient of your objective function "obj" by finite-difference quotients:...

ongeveer een maand ago | 0

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Answered
How do I optimize/find the minimum of a multi-variable function?
If you don't restrict your x- and y- variables to certain lower and upper bounds, the minimum of the function your get from "fit...

ongeveer een maand ago | 0

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Can I use fmincon with a whole model as function?
I don't see your problem. You call "fmincon" as sol = fmincon(@fun,x0) and write a function "fun" as function obj = fun(x) ...

ongeveer een maand ago | 0

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Answered
Regarding choosing correct boundary condition
If you set qL = 1 and qr = 1 and you defined f as f = D*du/dx in the function where you need to specify [c,f,s], you can specify...

ongeveer een maand ago | 0

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Answered
How to interpolate 2-parameter dependents matrices?
Use griddedInterpolant or scatteredInterpolant on each matrix element separately depending on whether the point pairs (Vi,qj) fo...

ongeveer een maand ago | 0

Answered
Mathematical Equations to MATLAB
%Parameters beta = 2; alpha = 200; Ccl = 2000; Cpm = 2500; Rl = 1100; Cren = 50000; delta = 0.223; P = 12; N = 8; Clo...

ongeveer een maand ago | 0

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Answered
How can I replace NaN in a table with a zero?
https://uk.mathworks.com/matlabcentral/answers/231096-replace-nan-s-in-table-with-zero

ongeveer een maand ago | 0