Answered

How to generate random numbers with constraints and different boundaries (for a high dimension)?

Neither of the choices on the FEX are directly a solution. randfixedsum fails because it explicitly assumes uniform bounds on th...

How to generate random numbers with constraints and different boundaries (for a high dimension)?

Neither of the choices on the FEX are directly a solution. randfixedsum fails because it explicitly assumes uniform bounds on th...

8 hours ago | 0

| accepted

Answered

finding roots of equation in matlab

In general the roots of a 6th degree polynomial with unknown coefficients cannot be found in an algebraic form. At least not unl...

finding roots of equation in matlab

In general the roots of a 6th degree polynomial with unknown coefficients cannot be found in an algebraic form. At least not unl...

1 day ago | 1

Answered

Estimating parameter uncertainty with fminsearch

I think I am starting to understand what you are askng. One very good option is to use abs. I've been told I could use better ab...

Estimating parameter uncertainty with fminsearch

I think I am starting to understand what you are askng. One very good option is to use abs. I've been told I could use better ab...

1 day ago | 0

| accepted

Answered

How can i randomly insert 14 1's in a array of two thousand zeros?

A = zeros(1,2000); A(randperm(2000,14)) = 1;

How can i randomly insert 14 1's in a array of two thousand zeros?

A = zeros(1,2000); A(randperm(2000,14)) = 1;

2 days ago | 2

| accepted

Answered

How to solve this ode problem

Use none of them. This is NOT an ODE problem, except that you seemed to want to write it as such. It is certainly not something ...

How to solve this ode problem

Use none of them. This is NOT an ODE problem, except that you seemed to want to write it as such. It is certainly not something ...

2 days ago | 0

| accepted

Answered

Calculate the distance between a linear regression line and the data points

I am confident that what you are asking is an orthogonal distance, not the vertical difference, frequently known as the residual...

Calculate the distance between a linear regression line and the data points

I am confident that what you are asking is an orthogonal distance, not the vertical difference, frequently known as the residual...

3 days ago | 0

Answered

How do I get the intersection function of 2 surfaces?

The intersection function will rarely exist as a "function". At best, it is an implicit function, thus a problem with solution l...

How do I get the intersection function of 2 surfaces?

The intersection function will rarely exist as a "function". At best, it is an implicit function, thus a problem with solution l...

5 days ago | 0

Answered

ode,dsolve,spline,ode interp, differantial

You are not asking to do anything more than to integrate a spline, and perhaps to plot the result as a function of x. (You don't...

ode,dsolve,spline,ode interp, differantial

You are not asking to do anything more than to integrate a spline, and perhaps to plot the result as a function of x. (You don't...

5 days ago | 0

| accepted

Answered

Integrating from polyint(p)

Sorry, but polyint cannot integrate a rational polynomial, and certainly not over an infinite region. Depending on the roots of ...

Integrating from polyint(p)

Sorry, but polyint cannot integrate a rational polynomial, and certainly not over an infinite region. Depending on the roots of ...

5 days ago | 0

| accepted

Answered

How to optimize matrix multiplication speed?

Do this: P = PHI*(P + Q)*PHI' + Q; While it may look exactly like the line of code you wrote, in fact, it is the same. Matrix ...

How to optimize matrix multiplication speed?

Do this: P = PHI*(P + Q)*PHI' + Q; While it may look exactly like the line of code you wrote, in fact, it is the same. Matrix ...

5 days ago | 0

| accepted

Answered

Algorithm to extract linearly dependent columns in a matrix

It is difficult to answer this. Consider a simple matrix: format short g A = rand(4,5) A = 0.73796 0.36725 0....

Algorithm to extract linearly dependent columns in a matrix

It is difficult to answer this. Consider a simple matrix: format short g A = rand(4,5) A = 0.73796 0.36725 0....

5 days ago | 0

| accepted

Answered

How can I create a function with random imputs? I have to create a function called tri_area that returns the area of a triangle with abse b and heigh h, where b and h are input arguments of the function in that order

I think you may be confused. I believe what is asked is for a function with ARBITRARY inputs, in the sense it can be called with...

How can I create a function with random imputs? I have to create a function called tri_area that returns the area of a triangle with abse b and heigh h, where b and h are input arguments of the function in that order

I think you may be confused. I believe what is asked is for a function with ARBITRARY inputs, in the sense it can be called with...

5 days ago | 2

Answered

The accuracy on my LSTM deep learning neural network will not exceed 62.96%

You have shown no data, so we cannot truly say if you are doing something wrong. However, it sounds as it what you are doing is:...

The accuracy on my LSTM deep learning neural network will not exceed 62.96%

You have shown no data, so we cannot truly say if you are doing something wrong. However, it sounds as it what you are doing is:...

5 days ago | 0

Answered

how can i get a number as an answer?

You got a number. :) I know, its net a very useful looking number. As s floating point sym, use vpa. vpa((23401992239682647381...

how can i get a number as an answer?

You got a number. :) I know, its net a very useful looking number. As s floating point sym, use vpa. vpa((23401992239682647381...

5 days ago | 0

Answered

why does similar code generate complex numbers?

What, for example, are the THREE cube roots of a negative number? We can find them all as solutions to the equation syms x xs...

why does similar code generate complex numbers?

What, for example, are the THREE cube roots of a negative number? We can find them all as solutions to the equation syms x xs...

7 days ago | 0

Answered

Is there a tool for drawing diagrams that connect equations?

I don't think there is a tool in MATLAB that will take a set of equations in arbitrary order, and then create this diagram. Yo...

Is there a tool for drawing diagrams that connect equations?

I don't think there is a tool in MATLAB that will take a set of equations in arbitrary order, and then create this diagram. Yo...

7 days ago | 0

Answered

How can ı solve this constraint optimization problem?

Many things you can do, but since this is your homework, and there are already answrs posted, I'll just suggest a couple of thin...

How can ı solve this constraint optimization problem?

Many things you can do, but since this is your homework, and there are already answrs posted, I'll just suggest a couple of thin...

7 days ago | 0

Answered

USING MEX TO SPEED UP THE CODE

As a counterpoint, there are some issues to consider. Much of MATLAB is already compiled code, at least in the hard working part...

USING MEX TO SPEED UP THE CODE

As a counterpoint, there are some issues to consider. Much of MATLAB is already compiled code, at least in the hard working part...

7 days ago | 1

| accepted

Answered

help solving differential equations

I think you have multiple problems here, now that you claim to have the correct equation. DSOLVE finds an analytical solution to...

help solving differential equations

I think you have multiple problems here, now that you claim to have the correct equation. DSOLVE finds an analytical solution to...

7 days ago | 0

Answered

Simplifying a algebraic or numeric expression to lowest possible power

The problem is, there are multiple solutions, because sqrt is not as simple a thing as you like. syms x >> y = sqrt(x.^2) y ...

Simplifying a algebraic or numeric expression to lowest possible power

The problem is, there are multiple solutions, because sqrt is not as simple a thing as you like. syms x >> y = sqrt(x.^2) y ...

8 days ago | 0

| accepted

Answered

Install 2 instances of Matlab on the same PC

Yes, and no. I frequently have several old versions of MATLAB on my computer. Walter has many as I recall. The only issue is if ...

Install 2 instances of Matlab on the same PC

Yes, and no. I frequently have several old versions of MATLAB on my computer. Walter has many as I recall. The only issue is if ...

8 days ago | 0

| accepted

Answered

Is there any method to calculate the inverse of matrix which changed a few values?

Bruno is correct in how to solve the problem, and also SOME of the issues with it. If you use this tool multiple times, the floa...

Is there any method to calculate the inverse of matrix which changed a few values?

Bruno is correct in how to solve the problem, and also SOME of the issues with it. If you use this tool multiple times, the floa...

8 days ago | 0

| accepted

Answered

wrong differential equation solution

Sorry. I don't know what you did incorrectly, but here is what I see. syms y(t) yalpha = (1/80)*(36*exp(-t) + 125*sin(t) -3*...

wrong differential equation solution

Sorry. I don't know what you did incorrectly, but here is what I see. syms y(t) yalpha = (1/80)*(36*exp(-t) + 125*sin(t) -3*...

8 days ago | 1

| accepted

Answered

How to limit calculation precision?

There are only two standard choices in MATLAB for floating point computations, and two ways to get round the problem. That is,...

How to limit calculation precision?

There are only two standard choices in MATLAB for floating point computations, and two ways to get round the problem. That is,...

8 days ago | 1

Answered

Question about Anderson-Darling (adtest)

Not using adtest. Like the Ford Model T, which Henry Ford sold in any color as long as the color you wanted was black, adtest te...

Question about Anderson-Darling (adtest)

Not using adtest. Like the Ford Model T, which Henry Ford sold in any color as long as the color you wanted was black, adtest te...

9 days ago | 1

| accepted

Answered

Problem of ``sprandn'': the number of nonzero elements is inconsistent with density

Bruno has already explained why sprand/sprandn fail to produce the requested density of arrays. So this answer is here only to a...

Problem of ``sprandn'': the number of nonzero elements is inconsistent with density

Bruno has already explained why sprand/sprandn fail to produce the requested density of arrays. So this answer is here only to a...

9 days ago | 1

Answered

How to place a number (1) in a random position in Line 1 in a matrix of zeros?

M = zeros(10,10); M(1,randi(10)) = 1; However, if you had no idea how to solve a basic problem of matrix indexing, you REALLY ...

How to place a number (1) in a random position in Line 1 in a matrix of zeros?

M = zeros(10,10); M(1,randi(10)) = 1; However, if you had no idea how to solve a basic problem of matrix indexing, you REALLY ...

9 days ago | 1

Answered

find the std of each parameter after lsqlin

There are some issues that make this a little problematic. The main issue is if lsqlin finds itself butted up against a boundary...

find the std of each parameter after lsqlin

There are some issues that make this a little problematic. The main issue is if lsqlin finds itself butted up against a boundary...

9 days ago | 0

| accepted

Answered

How do I remove the z variable in the polynomial equation?

What you don't understand is that IF you did what you want, the polynomial will become diffcult to use and difficult to evaluate...

How do I remove the z variable in the polynomial equation?

What you don't understand is that IF you did what you want, the polynomial will become diffcult to use and difficult to evaluate...

9 days ago | 1

| accepted

Answered

Can one run fminsearch on grids?

No. fminsearch presumes a continuously valued function, defined everywhere. You CANNOT use it to solve discrete problems. And ev...

Can one run fminsearch on grids?

No. fminsearch presumes a continuously valued function, defined everywhere. You CANNOT use it to solve discrete problems. And ev...

10 days ago | 0

| accepted