Respondida
About Fluid dynamics in a porous medium...
As @Torsten said, this is far too vague a question. I would suggest starting with a far simpler problem, especiially good is if...

casi 2 años hace | 0

| aceptada

Respondida
inversing huge Y Matrix
As always, I'll start by saying that computing the inverse of a matrix is a bad idea. And of course, you don't say what you thin...

casi 2 años hace | 0

Respondida
How can I solve this implicit function in MatLab?
Trivial, in some eyes. ;-) This is one of the simpler implicit problems you might write down, since a direct solution exists in ...

casi 2 años hace | 1

| aceptada

Respondida
How to add unknow parameter in matrix and solve it by use det() syntax for finding w
syms w; m1 = 1.8; m2 = 6.3; m3 = 5.4; m4 = 22.5; m5 = 54; c2 = 10000; c3 = 500; c4 = 1500; c5 = 1100; k2 = 1*10^8; k3...

casi 2 años hace | 0

Respondida
solving linear systems of equations
A long forgotten question and one with an answer that may not be appreciated by @Chloe St John, given that multiple questions by...

casi 2 años hace | 0

Respondida
MathWorks Administrator Account Privileges
Contact customer support at MathWorks. That is not Answers. We cannot help you directly. https://www.mathworks.com/support/cont...

casi 2 años hace | 0

Respondida
When integrating acceleration do you need to convert velocity?
When you keep on subtracting off the mean, you do strange things to the result. But you need to consider what a constant of inte...

casi 2 años hace | 0

Respondida
How to efficiently solve a system with an infinity number of solutions?
Note that a solution need not always exist for all n. When n==1, and so A is a 1x1 matrix, it is completely known. So unless yo...

casi 2 años hace | 0

Respondida
How can I calculate the integral of Legendre function P(n,theta) ?
@Shreen El-Sapa I think you do not understand that a Legendre polynomial is meaningless over some other interval. It has no spe...

casi 2 años hace | 1

Respondida
Create a matrix and a map of Hydrologic Soil Group values using integer or character values
MATLAB does indeed allow you to produce a character matrix, with those characters. However, I assume you have scattered data, wi...

casi 2 años hace | 0

Respondida
Determine row vector out of matrix with most evenly spaced and distributed values
Simple. Sort of. But you need to define what equal spacing means to you, and how you will measure the deviation from equal spaci...

casi 2 años hace | 0

| aceptada

Respondida
Are polyshape vertices preserved reliably without floating point errors?
Um, probably, yes. But potentially no. Yes, because on most operations, you will just be indexing into the original set of vert...

casi 2 años hace | 1

Respondida
Integrate function by for loop
As always look carefully at your code. Learn to use the debugger. It would tell you the problem, and in which line there was a p...

casi 2 años hace | 0

Respondida
matrix, where each element is a column vector
You don't need a cell array at all! Just use a 3-d array. A = randn(11,7,1001); Now to compute the max in each vector, just u...

casi 2 años hace | 1

Respondida
inverser la matrice tri-diagonale
As much as I hate the suggestion, you could trivially use inv. ;-) Better would be to use sparse matrices. That is, learn to us...

alrededor de 2 años hace | 0

Respondida
Solve long matrices equation
This is a classic algebraic Ricatti equation. https://en.wikipedia.org/wiki/Algebraic_Riccati_equation How do you solve it in ...

alrededor de 2 años hace | 0

Respondida
fminsearch doesn't converge to the right value
These things are always easier than you think. Well, except when they are just as hard as you think. ;-) First, I'll create x a...

alrededor de 2 años hace | 1

| aceptada

Respondida
How to use a variable from script in a function that is in another script
Just create your function like this. In my example, k3 and m3 will be assigned, so that you can see how it works. k3 = 3; m3 =...

alrededor de 2 años hace | 0

Respondida
How do I lower an image quality?
There are other ways to lower image quality. Several ideas have already been mentioned. Resize the image, then expand it back u...

alrededor de 2 años hace | 1

Respondida
I am struggling trying to figure out this code I have it completed but I keep getting errors, can you help?
I need to laugh (sorry, but it is true) every time I see someone claim they have completely written a long piece of code, and cl...

alrededor de 2 años hace | 0

Respondida
Finding intermediate points between two cartesian coordinates in 3D
You cannot find ALL the points between any pair, in any number of dimensions. At best, you can describe the set of all such poin...

alrededor de 2 años hace | 1

| aceptada

Respondida
How to find the point that resides on a contour that is closest to a known point?
You can't. That is, you cannot use calculus to do this, at least not as it is, not directly. That contour is a set of piecewise ...

alrededor de 2 años hace | 0

| aceptada

Respondida
i want to solve 3 non linear equations in matlab
You can want anything you want. I, for example, want to see peace in the world, with everyone treating everyone else as an equal...

alrededor de 2 años hace | 0

Respondida
I need the installer for Matlab R2010b SP1
We cannot help you. Answers does not have software, cannot supply it. The only people who would be able to help you are at MathW...

alrededor de 2 años hace | 0

Respondida
problem with genetic algorithm
Clearly, your constraint function is not evaluating as a real number. It is likely complex, based on the error message. (Though ...

alrededor de 2 años hace | 0

Respondida
fsolve stopped because the last step was ineffective
This is a common mistake I see being made. You have a problem that has symmetries in it. x(1), x(2), x(3) all play similar parts...

alrededor de 2 años hace | 1

| aceptada

Respondida
Accessing a vector form a matrix
As an example, given vectors x1,x2,x3. I'll make some up. x1 = randi(10,1,5) x2 = randi(10,1,5) x3 = randi(10,1,5) Combine t...

alrededor de 2 años hace | 0

Respondida
Find the variable inside the LCM argument
You have the expression: B=lcm(nrt,Nr*Nc) where the variables B and nrt are known. The unknown variable is the product nr*...

alrededor de 2 años hace | 1

Respondida
volume calculation from the DelaunayTri(x,y,z) function
Its not THAT hard. You compute the volume of each simplex in the tessellation. Sum the absolute values up. (Since those simplexe...

alrededor de 2 años hace | 1

| aceptada

Respondida
is there any reason for this?
Is there any reason? Well, does there absolutely need to be a "reason"? These are a set of choices, made over a period of multip...

alrededor de 2 años hace | 1

| aceptada