Answered

How to calculate between the elements in an array for consecutive indexes.

idx_1 = [32,33,34,35,36,37,38,39,40]; % 1 set of consecutive numbers idx_2 = [32,33,35,36,37,38,40,41,42]; % 3 sets of consec...

How to calculate between the elements in an array for consecutive indexes.

idx_1 = [32,33,34,35,36,37,38,39,40]; % 1 set of consecutive numbers idx_2 = [32,33,35,36,37,38,40,41,42]; % 3 sets of consec...

26 days ago | 1

| accepted

Answered

Can Ridge Regression solve my problem?

Don't buy a toolbox, if your only reason is to hope to use it to solve a problem where you don't fully understand how or why you...

Can Ridge Regression solve my problem?

Don't buy a toolbox, if your only reason is to hope to use it to solve a problem where you don't fully understand how or why you...

27 days ago | 0

| accepted

Answered

How do I declare a for loop with a given number of elements?

I'll only have a loop 5 elements long, as I'm feeling tired right now. :) jvals = linspace(0,0.03,5); for j = jvals disp(j)...

How do I declare a for loop with a given number of elements?

I'll only have a loop 5 elements long, as I'm feeling tired right now. :) jvals = linspace(0,0.03,5); for j = jvals disp(j)...

1 month ago | 1

| accepted

Answered

How to make a function that calculates many coefficients (>100) and reclaim them on many functions without having to return all these values?

Return a single struct that contains all of these variables as fields.

How to make a function that calculates many coefficients (>100) and reclaim them on many functions without having to return all these values?

Return a single struct that contains all of these variables as fields.

1 month ago | 1

Answered

How to fit data to the partial differential equation for 1-D diffusion?

Ok. I had some time to look at your surface more closely, It does not fit that PDE. It cannot do so. Now that I have your data.....

How to fit data to the partial differential equation for 1-D diffusion?

Ok. I had some time to look at your surface more closely, It does not fit that PDE. It cannot do so. Now that I have your data.....

1 month ago | 0

Answered

How can I introduce constraints to the nature of solutions provided by a boundary value problem solver such as bvp4c or bvp5c?

The simple fix that treats the problem in a way that is arguably correct, is to NOT work directly in terms of concentration! Tha...

How can I introduce constraints to the nature of solutions provided by a boundary value problem solver such as bvp4c or bvp5c?

The simple fix that treats the problem in a way that is arguably correct, is to NOT work directly in terms of concentration! Tha...

1 month ago | 0

Answered

Find the max of a vector recursive

This is a godawful problem to solve using recursive coding. Why? Suppose your vector has a million elements in it. Then this cod...

Find the max of a vector recursive

This is a godawful problem to solve using recursive coding. Why? Suppose your vector has a million elements in it. Then this cod...

1 month ago | 0

| accepted

Answered

How to fix this error “Index exceeds the number of array elements (57)” while using minboundquad function

That code was written so long ago, I forgot I ever wrote it. But also, it was written in the days when the convex hull and trian...

How to fix this error “Index exceeds the number of array elements (57)” while using minboundquad function

That code was written so long ago, I forgot I ever wrote it. But also, it was written in the days when the convex hull and trian...

1 month ago | 0

Answered

matrix calculation for matrix

Simple. One line. No for loop. Nothing hard. B = A(10:10:end,:);

matrix calculation for matrix

Simple. One line. No for loop. Nothing hard. B = A(10:10:end,:);

1 month ago | 1

Answered

Why this function infinity loop

Because if your powers grow larger than 2^53-1 (i.e., flintmax), the number is no longer expressable exactly as an integer. All ...

Why this function infinity loop

Because if your powers grow larger than 2^53-1 (i.e., flintmax), the number is no longer expressable exactly as an integer. All ...

1 month ago | 0

Answered

why ga does not respect upper bounds ?

Um, ub = [40 1e6 1e6 1e6 1e4 1e4 9000]; numel(ub) I can count, but I let MATLAB do it for me. As you should see, you posed o...

why ga does not respect upper bounds ?

Um, ub = [40 1e6 1e6 1e6 1e4 1e4 9000]; numel(ub) I can count, but I let MATLAB do it for me. As you should see, you posed o...

1 month ago | 1

| accepted

Answered

i which library can i find those two functions (h-plane and e-plane) ?

There is NO such library, because those are not legal function names in MATLAB. A dash is not legal in a name, in a function OR ...

i which library can i find those two functions (h-plane and e-plane) ?

There is NO such library, because those are not legal function names in MATLAB. A dash is not legal in a name, in a function OR ...

1 month ago | 0

Answered

How to neatly or properly display the answers for simultaneous equations?

You may want to learn how to use the symbolic toolbox, which can display answers in a form you may want. A = [2 3 5; 3 4 7; 1 1...

How to neatly or properly display the answers for simultaneous equations?

You may want to learn how to use the symbolic toolbox, which can display answers in a form you may want. A = [2 3 5; 3 4 7; 1 1...

1 month ago | 0

| accepted

Solved

Divisible by 2

This is the first problem in a set of "divisible by x" problems. You will be provided a number as a string and the function you ...

1 month ago

Answered

First order derivative using Curve Fitter (smoothing spline fit)

For example, we might try using the same fit, on some data where I know the answer. x = rand(100,1)*2*pi; y = sin(x) + randn(s...

First order derivative using Curve Fitter (smoothing spline fit)

For example, we might try using the same fit, on some data where I know the answer. x = rand(100,1)*2*pi; y = sin(x) + randn(s...

1 month ago | 0

Answered

csv to .mat file

help csvread help save Perhaps you need to do the Onramp MATLAB tutorial?

csv to .mat file

help csvread help save Perhaps you need to do the Onramp MATLAB tutorial?

1 month ago | 1

Answered

Optimize function wich only admits scalar input

FIRST, NEVER return a variable that has the same name as your function. That is a dangerously, recursively incestuous operation ...

Optimize function wich only admits scalar input

FIRST, NEVER return a variable that has the same name as your function. That is a dangerously, recursively incestuous operation ...

1 month ago | 0

Answered

How to tell solver that symbols are matrices

A = sym('a',[2,2]) As you can see, A is a 2x2 matrix. B = rand(2,2); X = rand(2,2); Asol = solve(A*X == B,A) So now, for ...

How to tell solver that symbols are matrices

A = sym('a',[2,2]) As you can see, A is a 2x2 matrix. B = rand(2,2); X = rand(2,2); Asol = solve(A*X == B,A) So now, for ...

1 month ago | 0

Answered

How to simplify this symbolic equation - nominator and denominator manipulation

I never did understand why people worry about making a symbolic tool give a result in a mathematically identical form, that happ...

How to simplify this symbolic equation - nominator and denominator manipulation

I never did understand why people worry about making a symbolic tool give a result in a mathematically identical form, that happ...

2 months ago | 0

| accepted

Answered

Estimate area inside point cloud

As long as the curve is a sequence of points defining the perimeter and they are distinct, you can just compute the area using a...

Estimate area inside point cloud

As long as the curve is a sequence of points defining the perimeter and they are distinct, you can just compute the area using a...

2 months ago | 1

Answered

Graphing a polyfit function

DON'T USE A HIGH ORDER POLYNOMIAL! DON'T USE A HIGH ORDER POLYNOMIAL! DON'T USE A HIGH ORDER POLYNOMIAL! Do I need to say it ...

Graphing a polyfit function

DON'T USE A HIGH ORDER POLYNOMIAL! DON'T USE A HIGH ORDER POLYNOMIAL! DON'T USE A HIGH ORDER POLYNOMIAL! Do I need to say it ...

2 months ago | 0

Answered

natural cubic spline interpolation matlab

PLEASE DO NOT SEND ME E-MAIL ASKING FOR HELP. I ask people not to do this. (Note that for those people who might decide to do so...

natural cubic spline interpolation matlab

PLEASE DO NOT SEND ME E-MAIL ASKING FOR HELP. I ask people not to do this. (Note that for those people who might decide to do so...

2 months ago | 0

Answered

How can I show only the data from variable?

Use semi-colons at the end of those lines where you do not want to see all the crapola dumped to the command window.

How can I show only the data from variable?

Use semi-colons at the end of those lines where you do not want to see all the crapola dumped to the command window.

2 months ago | 0

Answered

New Variables & Name in loop

Don't do it. https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval...

New Variables & Name in loop

Don't do it. https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval...

2 months ago | 1

Answered

How to select last digit of numbers and put it into a matrix?

Well, since you did write a fair amount of code, homework or not is irrelevant. There are some issues with your code however. ...

How to select last digit of numbers and put it into a matrix?

Well, since you did write a fair amount of code, homework or not is irrelevant. There are some issues with your code however. ...

2 months ago | 0

| accepted

Answered

Real solutions to polynomials

When you use solve, remember that first of all, it will be impossible to find algebraic solutions to a general polynomial of deg...

Real solutions to polynomials

When you use solve, remember that first of all, it will be impossible to find algebraic solutions to a general polynomial of deg...

2 months ago | 0

Answered

Why in a function an output argument isn't saved to workspace?

Suppose you use ANY MATLAB function? How does it work? For example... x = 1:5; Suppose you want to compute the mean of that ve...

Why in a function an output argument isn't saved to workspace?

Suppose you use ANY MATLAB function? How does it work? For example... x = 1:5; Suppose you want to compute the mean of that ve...

2 months ago | 0

| accepted

Answered

Hilbert Matrix in least squares polynomial regression

Is A really a hilbert matrix? LOOK CAREFULLY AT WHAT YOU WRITE!!!!!!!!! In fact, A is not even a valid 3x3 matrix. If you fail ...

Hilbert Matrix in least squares polynomial regression

Is A really a hilbert matrix? LOOK CAREFULLY AT WHAT YOU WRITE!!!!!!!!! In fact, A is not even a valid 3x3 matrix. If you fail ...

2 months ago | 1

Answered

Find a value in a matrix

help max Look at the SECOND argument returned from max.

Find a value in a matrix

help max Look at the SECOND argument returned from max.

2 months ago | 0

Answered

How to find solution using VPASOLVE

You have 2 variables, with 4 equations. vpasolve is NOT a tool that attmepts to solve a problem APPROXIMATELY. You cannot use vp...

How to find solution using VPASOLVE

You have 2 variables, with 4 equations. vpasolve is NOT a tool that attmepts to solve a problem APPROXIMATELY. You cannot use vp...

2 months ago | 0