Answered

numerical solution of a system of ODE which is not in standard form

Your question seems to be one of solving a system of ODEs with a mass matrix. For example in the help for ODE45, we see this opt...

numerical solution of a system of ODE which is not in standard form

Your question seems to be one of solving a system of ODEs with a mass matrix. For example in the help for ODE45, we see this opt...

alrededor de 22 horas ago | 1

Answered

calculate tension by raphson newton in matlab

You have indicated these coefficients, although I worry there may be issues, because of the use of lower versus upper case W, et...

calculate tension by raphson newton in matlab

You have indicated these coefficients, although I worry there may be issues, because of the use of lower versus upper case W, et...

alrededor de 23 horas ago | 0

Answered

Interpolating n-dimensional functions

First, IF you have a complete gridded lattice, then you don't want to use griddatan. That is DEFINITELY a BAD idea. Why? Because...

Interpolating n-dimensional functions

First, IF you have a complete gridded lattice, then you don't want to use griddatan. That is DEFINITELY a BAD idea. Why? Because...

1 día ago | 0

Answered

What am I missing here?

Thank you. That makes it much easier for someone to offer you help. Now I'll be willing to look at the problem you had. It loo...

What am I missing here?

Thank you. That makes it much easier for someone to offer you help. Now I'll be willing to look at the problem you had. It loo...

2 días ago | 1

Answered

How to extrapolate a contour plot?

Let me see. You have data in only 25% of the region of interest. Now you want to extrapolate that data into a region that compri...

How to extrapolate a contour plot?

Let me see. You have data in only 25% of the region of interest. Now you want to extrapolate that data into a region that compri...

3 días ago | 0

Answered

To solve non-linear equation by inversion notion

STOP. Is this nonlinear? Or is it linear? A*X = b is still LINEAR, even if the array is not square. Even in the linear case, t...

To solve non-linear equation by inversion notion

STOP. Is this nonlinear? Or is it linear? A*X = b is still LINEAR, even if the array is not square. Even in the linear case, t...

3 días ago | 0

Answered

how to use reshape ?

The good thing about reshape is IF you put in an empty argument, then it figures out how many columns you will need. But first,...

how to use reshape ?

The good thing about reshape is IF you put in an empty argument, then it figures out how many columns you will need. But first,...

3 días ago | 2

Answered

Is an infinite for loop infinite?

We can always try it. Perhaps we can learn something about how the loop works, done by a careful test. Remember that doubles are...

Is an infinite for loop infinite?

We can always try it. Perhaps we can learn something about how the loop works, done by a careful test. Remember that doubles are...

3 días ago | 1

| accepted

Answered

how to fit 3 lines with one equation

Easy to answer. Is it possible? Of course. Anything is possible, though it may take a heck of a lot of work. I could even fin...

how to fit 3 lines with one equation

Easy to answer. Is it possible? Of course. Anything is possible, though it may take a heck of a lot of work. I could even fin...

5 días ago | 0

Answered

Image Processing on point clouds

If you want to use image processing tools, you pretty much need an image. Those tools are not written to work without one, certa...

Image Processing on point clouds

If you want to use image processing tools, you pretty much need an image. Those tools are not written to work without one, certa...

5 días ago | 0

Answered

Error in Eigen Values

Is KSr a double precision matrix, or a function, in the form of a function handle, or the name of an m-file function? That seems...

Error in Eigen Values

Is KSr a double precision matrix, or a function, in the form of a function handle, or the name of an m-file function? That seems...

5 días ago | 0

Answered

Multiplication of two polynomials having different variables

The simple answer is to use the symbolic toolbox. If you have it, I cannnot think of a good reason why you would not use it. sy...

Multiplication of two polynomials having different variables

The simple answer is to use the symbolic toolbox. If you have it, I cannnot think of a good reason why you would not use it. sy...

5 días ago | 0

| accepted

Answered

geometric progression and multiply by a common variable, help me pls.

So, you want this? B = 3; C = B*20*sqrt(2).^(0:10) C = Columns 1 through 9 60 84.853 120 ...

geometric progression and multiply by a common variable, help me pls.

So, you want this? B = 3; C = B*20*sqrt(2).^(0:10) C = Columns 1 through 9 60 84.853 120 ...

7 días ago | 1

Answered

f(x,y)<=0

I can see several ways off the top of my head. Consider some arbitrary implicit function. fun = @(x,y) x.^2 + y.^3 - 3; Easy ...

f(x,y)<=0

I can see several ways off the top of my head. Consider some arbitrary implicit function. fun = @(x,y) x.^2 + y.^3 - 3; Easy ...

7 días ago | 0

Answered

how to decode the message 67 44 41 49 39 19 113 76 62 104 69 55.

A good clue to the answer "Is this code correct", when applied to a homework assignment like this is if you get something that m...

how to decode the message 67 44 41 49 39 19 113 76 62 104 69 55.

A good clue to the answer "Is this code correct", when applied to a homework assignment like this is if you get something that m...

7 días ago | 0

Answered

Baseball trajectory with drag and wind

This is almost a classical problem, and the reason stiff ODE solvers were provided. Essentially, when you get that error using O...

Baseball trajectory with drag and wind

This is almost a classical problem, and the reason stiff ODE solvers were provided. Essentially, when you get that error using O...

7 días ago | 0

Answered

Generating dispersed (non-integer) random matrix/array that sums to a particular value

I think you do not understand what you are asking. randfixedssum indeed produces results that are uniformly sistributed within...

Generating dispersed (non-integer) random matrix/array that sums to a particular value

I think you do not understand what you are asking. randfixedssum indeed produces results that are uniformly sistributed within...

8 días ago | 0

| accepted

Answered

What frustrates you about MATLAB? #2

That the mind reading toolbox has never become available for general use? ;-) Truly, that scares me just a bit if it ever truly...

What frustrates you about MATLAB? #2

That the mind reading toolbox has never become available for general use? ;-) Truly, that scares me just a bit if it ever truly...

8 días ago | 2

Answered

Code to produce orthogonal rows in a N* N matrices

Not that hard. First check, is this homework? Hmm. Highly unlikely, since I had to think for at least a second about how to solv...

Code to produce orthogonal rows in a N* N matrices

Not that hard. First check, is this homework? Hmm. Highly unlikely, since I had to think for at least a second about how to solv...

8 días ago | 2

| accepted

Answered

Double integration of a binomial function (in x and y) generated from two row arrays

I follow what you did (possibly) A = 10; B = 20; a = [0, 1, 2, 3, 4]; b = [5, 6, 7, 8, 9]; syms x y x = sym('x'); y = sym...

Double integration of a binomial function (in x and y) generated from two row arrays

I follow what you did (possibly) A = 10; B = 20; a = [0, 1, 2, 3, 4]; b = [5, 6, 7, 8, 9]; syms x y x = sym('x'); y = sym...

9 días ago | 1

| accepted

Answered

Bilinear and Trilinear Interpolation

Wow. I guess I've been working with those tools for so many years, as well as building variations of them, that I think of them ...

Bilinear and Trilinear Interpolation

Wow. I guess I've been working with those tools for so many years, as well as building variations of them, that I think of them ...

9 días ago | 1

| accepted

Answered

How to solve PDE problem

This is second order in the time derivative, so there is a utt term. But that should make in not in the realm of pdepe, which al...

How to solve PDE problem

This is second order in the time derivative, so there is a utt term. But that should make in not in the realm of pdepe, which al...

9 días ago | 0

Answered

1D Linear Elasticity Equivalent Stiffness Solution not being solved (6 equations and 6 vars)

These are differential equations, a boundary value problem. We use dsolve to solve it. For example, a simple example is: syms ...

1D Linear Elasticity Equivalent Stiffness Solution not being solved (6 equations and 6 vars)

These are differential equations, a boundary value problem. We use dsolve to solve it. For example, a simple example is: syms ...

9 días ago | 1

| accepted

Answered

Double integration of a binomial function (in x and y) generated from two row arrays

Let me explain, because you either have a simple problem to solve, or an impossible one. I've restated my comment as an answer,...

Double integration of a binomial function (in x and y) generated from two row arrays

Let me explain, because you either have a simple problem to solve, or an impossible one. I've restated my comment as an answer,...

9 días ago | 1

Answered

cubic interpolation vs spline interpolation vs cubic spline interpolation?

pchip is not a true cubic spline, in the sense that it is not a twice differentiable piecewise cubic interpolant. pchip is only ...

cubic interpolation vs spline interpolation vs cubic spline interpolation?

pchip is not a true cubic spline, in the sense that it is not a twice differentiable piecewise cubic interpolant. pchip is only ...

9 días ago | 0

Answered

F solve error, how can I fix it?

There are no real solutions. First, I converted them to a problem that fimplicit can use. F1 = @(x,y) -(118/121)*x.^2-(333/242)...

F solve error, how can I fix it?

There are no real solutions. First, I converted them to a problem that fimplicit can use. F1 = @(x,y) -(118/121)*x.^2-(333/242)...

9 días ago | 0

Answered

how to do the equation following its answer on matlab?

There is the obvious... Using y = 1/z, we can transform the problem. syms z y Fz = (1/z + 1/z^2 - 1/z^3)/(1 + 1/z + 1/z^2 + 4...

how to do the equation following its answer on matlab?

There is the obvious... Using y = 1/z, we can transform the problem. syms z y Fz = (1/z + 1/z^2 - 1/z^3)/(1 + 1/z + 1/z^2 + 4...

10 días ago | 0

| accepted

Answered

Got an Error Using Grid -Unknown Command Option

You don't get charged less for MATLAB, if you save on lines of code. They also don't charge less if you use another comma. You ...

Got an Error Using Grid -Unknown Command Option

You don't get charged less for MATLAB, if you save on lines of code. They also don't charge less if you use another comma. You ...

10 días ago | 0

Answered

why the result of the following code vector y is not equals to y1 or y2 . How can I get the equals of them.

y2 y2 = 3414.6226519281 3421.81651603882 3493.03577073497 3510.3010446007 ...

why the result of the following code vector y is not equals to y1 or y2 . How can I get the equals of them.

y2 y2 = 3414.6226519281 3421.81651603882 3493.03577073497 3510.3010446007 ...

11 días ago | 1