Answered

Chosing the step between lower bound and upper bound in genetic algorithm

Actually, this is simple. even trivial. Can you force a variable to take on integer valiues in GA? (yes) In the help for GA, I...

Chosing the step between lower bound and upper bound in genetic algorithm

Actually, this is simple. even trivial. Can you force a variable to take on integer valiues in GA? (yes) In the help for GA, I...

1 month ago | 0

Answered

how to find the root of function?

Or do this: alpha=0.74; g =0.5; gamma=1.2; sigma=1; phi=0.8; epsilon_1=1.5; w_r= (epsilon_1-1)/epsilon_1; syms n_h a ...

how to find the root of function?

Or do this: alpha=0.74; g =0.5; gamma=1.2; sigma=1; phi=0.8; epsilon_1=1.5; w_r= (epsilon_1-1)/epsilon_1; syms n_h a ...

1 month ago | 0

Answered

Optimizing 1 equation with 7 variables

You do understand this is likely impossible to do? If there are ANY solutions which satisfy the given equality, then there are ...

Optimizing 1 equation with 7 variables

You do understand this is likely impossible to do? If there are ANY solutions which satisfy the given equality, then there are ...

1 month ago | 1

| accepted

Answered

Collatz Conjecture using for loop

Your code is close to a working algorithm. There are some issues truly good code would worry about. Could you ever have an over...

Collatz Conjecture using for loop

Your code is close to a working algorithm. There are some issues truly good code would worry about. Could you ever have an over...

1 month ago | 2

| accepted

Answered

Hi everyone, i want to ask about curve fitting problem,

Invariably the data will vary by multiple orders of magnitude in such a problem. And that tends to imply the noise in your data ...

Hi everyone, i want to ask about curve fitting problem,

Invariably the data will vary by multiple orders of magnitude in such a problem. And that tends to imply the noise in your data ...

1 month ago | 1

Answered

Use a while loop to determine how many Fibonacci numbers are less than 100000.

What does your test do? That is... while x < 100000 Answer it tells when the INDEX of the Fibonacci number is less than 100000...

Use a while loop to determine how many Fibonacci numbers are less than 100000.

What does your test do? That is... while x < 100000 Answer it tells when the INDEX of the Fibonacci number is less than 100000...

1 month ago | 0

Answered

I have a Matrix , and I want to multiply this Matrix with something so I can get zeros

Please stop posting answers when you are making only comments. In what you claim to have tried: A=[-3 6 -1 1 7;1 -2 2 3 -1;2 -...

I have a Matrix , and I want to multiply this Matrix with something so I can get zeros

Please stop posting answers when you are making only comments. In what you claim to have tried: A=[-3 6 -1 1 7;1 -2 2 3 -1;2 -...

1 month ago | 0

Answered

How to solve an equation system using a interp1-variable

interp1 is incompatible with symbolic parameters. You CANNOT use interp1 with solve. Period. So wherever you found that snippet ...

How to solve an equation system using a interp1-variable

interp1 is incompatible with symbolic parameters. You CANNOT use interp1 with solve. Period. So wherever you found that snippet ...

1 month ago | 0

| accepted

Answered

I have the following code to calculate d/dx sin(0.5)) using first derivative principle and compare it with the real value. Why does err starts increasing again?

What are you doing? You used a simple forward difference to compute the derivative, as an approximation to the derivative of sin...

I have the following code to calculate d/dx sin(0.5)) using first derivative principle and compare it with the real value. Why does err starts increasing again?

What are you doing? You used a simple forward difference to compute the derivative, as an approximation to the derivative of sin...

1 month ago | 1

| accepted

Answered

The running time of binary integer linear programming and linear programming

Why is there something "wrong"? It is unexpected for you. But this just comes down to two different problems, solved by differen...

The running time of binary integer linear programming and linear programming

Why is there something "wrong"? It is unexpected for you. But this just comes down to two different problems, solved by differen...

1 month ago | 0

| accepted

Answered

Matlab only calculates values for only certain inputs in a matrix.

Except that is not how to use a loop. You want to compute the inverse of each value in the array. function convof= inverseof(x)...

Matlab only calculates values for only certain inputs in a matrix.

Except that is not how to use a loop. You want to compute the inverse of each value in the array. function convof= inverseof(x)...

1 month ago | 0

| accepted

Answered

Am I understanding this correctly?

Yes. Colors that you would describe as red all have high values in the red channel, and small values in the green and blue chann...

Am I understanding this correctly?

Yes. Colors that you would describe as red all have high values in the red channel, and small values in the green and blue chann...

1 month ago | 0

Answered

How to make constant to 1 in power function in curve fitting toolbox

Before you EVER make any fit to data, PLOT IT!!!!!!!! Plot your data. Then plot it in another way, until you have drained all th...

How to make constant to 1 in power function in curve fitting toolbox

Before you EVER make any fit to data, PLOT IT!!!!!!!! Plot your data. Then plot it in another way, until you have drained all th...

1 month ago | 0

Answered

fsolve doesn't find a solution when the value of the objective function is obtained through a Montecarlo simulation

Is your objective function a differentiable result of the parameters? If not, then fsolve cannot solve the problem. Fsol ve requ...

fsolve doesn't find a solution when the value of the objective function is obtained through a Montecarlo simulation

Is your objective function a differentiable result of the parameters? If not, then fsolve cannot solve the problem. Fsol ve requ...

1 month ago | 0

Answered

How to create a vector of symbolic variables with specific labeling

The simple direct way seems easiest. v = sym('v',[1 29]); v = v([1 2 3 5 7 9 10 12 18 29])

How to create a vector of symbolic variables with specific labeling

The simple direct way seems easiest. v = sym('v',[1 29]); v = v([1 2 3 5 7 9 10 12 18 29])

1 month ago | 0

Answered

Unable to plot exponential graphs properly

What do you reasonably expect to happen? t varies over the interval -10 and 400. What is exp(-10)? If you don't know, then try ...

Unable to plot exponential graphs properly

What do you reasonably expect to happen? t varies over the interval -10 and 400. What is exp(-10)? If you don't know, then try ...

1 month ago | 0

| accepted

Answered

Plot graph of polynomials

That is not a polynomial. You have a sqrt root in there. And an absolute value. So learn how to use functions like abs, and sqr...

Plot graph of polynomials

That is not a polynomial. You have a sqrt root in there. And an absolute value. So learn how to use functions like abs, and sqr...

2 months ago | 1

| accepted

Answered

Can someone explain to me why I'm getting "Not enough input arguments" in line 2

For the simple reason that you named a function named size. Don't do this. Type this at the command line: which size -all If i...

Can someone explain to me why I'm getting "Not enough input arguments" in line 2

For the simple reason that you named a function named size. Don't do this. Type this at the command line: which size -all If i...

2 months ago | 0

Answered

Solving a system of equations with arbitrary Parameter value

Look carefullly at what is returned. solution = solve(eqn_final, variable_final, "ReturnConditions", true); solution solution...

Solving a system of equations with arbitrary Parameter value

Look carefullly at what is returned. solution = solve(eqn_final, variable_final, "ReturnConditions", true); solution solution...

2 months ago | 0

| accepted

Answered

why PSI values are diffrent when nlmefit using ode45 solver compared to when it uses analytical solution?

There can sometimes be problems when you try to apply a nonlinear estimation scheme on top of an ODE solver. The nonlinear fitti...

why PSI values are diffrent when nlmefit using ode45 solver compared to when it uses analytical solution?

There can sometimes be problems when you try to apply a nonlinear estimation scheme on top of an ODE solver. The nonlinear fitti...

2 months ago | 0

Answered

I don't know how to call my function

What language are you using here? Possibly not MATLAB. :) s = s + L*(i)^2; Do you think that squares the number i, and then mu...

I don't know how to call my function

What language are you using here? Possibly not MATLAB. :) s = s + L*(i)^2; Do you think that squares the number i, and then mu...

2 months ago | 0

Answered

How efficient is it to use (end+1) to add a value to an array?

Increasing the size of an array incrementally is a TERRIBLE thing to do. WHY? Every time you add a new element to the end of t...

How efficient is it to use (end+1) to add a value to an array?

Increasing the size of an array incrementally is a TERRIBLE thing to do. WHY? Every time you add a new element to the end of t...

2 months ago | 1

Answered

How to use ~= operator as constraint function?

For which solver? This is a 1-variable problem. If you want help, it does help if you explain more than you have done. Note tha...

How to use ~= operator as constraint function?

For which solver? This is a 1-variable problem. If you want help, it does help if you explain more than you have done. Note tha...

2 months ago | 1

Answered

solve efficiently sparse large linear system of equations

The fact is, a 3kx3k system is not that slow to solve. So unless you are doing this solve many thousands of times, keeping it sp...

solve efficiently sparse large linear system of equations

The fact is, a 3kx3k system is not that slow to solve. So unless you are doing this solve many thousands of times, keeping it sp...

2 months ago | 0

Answered

Matlab envelope function help

Seems pretty easy. Read the help, and look at the examples. Envelope is part of the signal processing toolbox. t = linspace(0,5...

Matlab envelope function help

Seems pretty easy. Read the help, and look at the examples. Envelope is part of the signal processing toolbox. t = linspace(0,5...

2 months ago | 0

| accepted

Answered

Solving equations for Variable/Variable

No reason you cannot do this: syms A B C D E eqn = (A*B*C)/E == D; syms CoverD solve(subs(eqn,C,CoverD*D),CoverD)

Solving equations for Variable/Variable

No reason you cannot do this: syms A B C D E eqn = (A*B*C)/E == D; syms CoverD solve(subs(eqn,C,CoverD*D),CoverD)

2 months ago | 0

| accepted

Answered

Am I to understand that every function in matlab should be its own file?

Like SOME languages. Perhaps the ones you know. But certainly not all other languages. In general, yes, it is not unreasonable ...

Am I to understand that every function in matlab should be its own file?

Like SOME languages. Perhaps the ones you know. But certainly not all other languages. In general, yes, it is not unreasonable ...

2 months ago | 1

Answered

Find Image SVD without using SVD command

Too late for an answer to the question posed, but since the question is getting comments asking for more help, I'll post an answ...

Find Image SVD without using SVD command

Too late for an answer to the question posed, but since the question is getting comments asking for more help, I'll post an answ...

2 months ago | 1

Answered

How to find the closed form solution of the natural and forced response of 2sin(3t) - 4x with x(0) = 0

Why do you think it is not correct? Would dsolve lie? That dsolve code must be pretty darn tricky. In fact, you have not used d...

How to find the closed form solution of the natural and forced response of 2sin(3t) - 4x with x(0) = 0

Why do you think it is not correct? Would dsolve lie? That dsolve code must be pretty darn tricky. In fact, you have not used d...

2 months ago | 1

| accepted

Answered

parallel computing in Genetic algorithm

Whenever I see someone say they need to use parallel computing to make their code run faster, I wonder if the real problem is th...

parallel computing in Genetic algorithm

Whenever I see someone say they need to use parallel computing to make their code run faster, I wonder if the real problem is th...

2 months ago | 0