Answered

Irregular intervals inside a for loop

There are multiple ways to do this. For example: P = primes(20); % Note that P is a ROW vector P SumP = 0; for P_i = P Su...

Irregular intervals inside a for loop

There are multiple ways to do this. For example: P = primes(20); % Note that P is a ROW vector P SumP = 0; for P_i = P Su...

2 meses ago | 0

Highlighted

Counting the passengers on a train: solving a basic problem using MATLAB

I saw this problem online recently. <https://www.youtube.com/watch?v=-rbozrj9poo Passenger distribution on a train> Not a...

2 meses ago | 6

Answered

Which triangulation method does alphaTriangulation?

An alpha shape starts with a Delaunay triangulation. Then some parts of it are deleted as defined by the alpha shape. (Having wr...

Which triangulation method does alphaTriangulation?

An alpha shape starts with a Delaunay triangulation. Then some parts of it are deleted as defined by the alpha shape. (Having wr...

2 meses ago | 0

Answered

Locate index and weights for linear interpolation for a monotonically increasing vector

I cannot compare your code to something meaningful because your code is not complete. It lacks mustBeLogical, and possibly other...

Locate index and weights for linear interpolation for a monotonically increasing vector

I cannot compare your code to something meaningful because your code is not complete. It lacks mustBeLogical, and possibly other...

2 meses ago | 1

Answered

Solving 3 equations with 3 unknowns using for loop ?

syms Xb Xm a E1 = (Xb-Xm*25e-3)*(-230.6815e-6*a) == (1.05e3-1.01038e3)*9.81*1.2566e-6 ; E2 = (Xb-Xm*50e-3)*(-108.65e-6*a) == (...

Solving 3 equations with 3 unknowns using for loop ?

syms Xb Xm a E1 = (Xb-Xm*25e-3)*(-230.6815e-6*a) == (1.05e3-1.01038e3)*9.81*1.2566e-6 ; E2 = (Xb-Xm*50e-3)*(-108.65e-6*a) == (...

2 meses ago | 1

Answered

Can the equations in the differential equation group be represented by symbols when matlab ode solves the differential equation group ?

Sorry, but the numerical ode solvers, such as ODE45 are NOT symbolic tools. They CANNOT solve an ode with symbolic parameters. P...

Can the equations in the differential equation group be represented by symbols when matlab ode solves the differential equation group ?

Sorry, but the numerical ode solvers, such as ODE45 are NOT symbolic tools. They CANNOT solve an ode with symbolic parameters. P...

2 meses ago | 0

Answered

How to I find x in sin(x) = 0.65

Simple enough. I'll use solve, since you mentioned that. What happens if you just call solve? syms x solve(sin(x) == 0.5) So ...

How to I find x in sin(x) = 0.65

Simple enough. I'll use solve, since you mentioned that. What happens if you just call solve? syms x solve(sin(x) == 0.5) So ...

2 meses ago | 1

Answered

How do I create this full diagonal matrix

What are you doing with the matrix x, once you create a matrix with the diagonal in question? Does MATLAB know what you are doin...

How do I create this full diagonal matrix

What are you doing with the matrix x, once you create a matrix with the diagonal in question? Does MATLAB know what you are doin...

2 meses ago | 0

Answered

Polynomial surface fitting problem with constraint y <=1

You have the model: y = a*x1^b + c*x2^d I'll assume that x1 is temperature, and x2 is current discharged. You have told u...

Polynomial surface fitting problem with constraint y <=1

You have the model: y = a*x1^b + c*x2^d I'll assume that x1 is temperature, and x2 is current discharged. You have told u...

2 meses ago | 1

| accepted

Answered

Is it posible to solve system of differential equations with piecewise function inside?

Well, actually, yes you can solve the problem using a numerical ODE solver. That is trivial. For example, consider the simple pr...

Is it posible to solve system of differential equations with piecewise function inside?

Well, actually, yes you can solve the problem using a numerical ODE solver. That is trivial. For example, consider the simple pr...

2 meses ago | 0

Answered

how to get common range for several intervals

Please stop asking the same question over and over again. Finding the sub-interval that covers the maximum number of intervals...

how to get common range for several intervals

Please stop asking the same question over and over again. Finding the sub-interval that covers the maximum number of intervals...

2 meses ago | 1

Answered

A set of data has two large intervals, can it be divided into two sets of data? Thanks for your answer.

Are you asking how to divide this into two separate curves, the upper half, and the lower half? I can only assume that is your g...

A set of data has two large intervals, can it be divided into two sets of data? Thanks for your answer.

Are you asking how to divide this into two separate curves, the upper half, and the lower half? I can only assume that is your g...

2 meses ago | 1

| accepted

Answered

Writing a script for Goldbach's Conjecture

Let me suggest you are starting from the wrong end? Instead, start with all primes less than your target maximum, so 1000. Can ...

Writing a script for Goldbach's Conjecture

Let me suggest you are starting from the wrong end? Instead, start with all primes less than your target maximum, so 1000. Can ...

2 meses ago | 0

Answered

who does logical works

When something is too big or complicated, TAKE IT APART. TRY IT. x= [ 2 3 4 8 10 0 -2] So x is a vector of integers. What doe...

who does logical works

When something is too big or complicated, TAKE IT APART. TRY IT. x= [ 2 3 4 8 10 0 -2] So x is a vector of integers. What doe...

2 meses ago | 1

Answered

CRT gamut solid

Not totally pertinent, but years ago, I built a solid model of some gamuts. I no longer have it, since I gave it away when I ret...

CRT gamut solid

Not totally pertinent, but years ago, I built a solid model of some gamuts. I no longer have it, since I gave it away when I ret...

2 meses ago | 1

Answered

Backslash for inverse to solve Ax=B

When you have a singular system, then pinv and backslash will both attempt to solve the problem, to the extent they can. I seri...

Backslash for inverse to solve Ax=B

When you have a singular system, then pinv and backslash will both attempt to solve the problem, to the extent they can. I seri...

2 meses ago | 0

| accepted

Answered

how do i write commands for errors and warnings in Matlab

You wrote code for an ERROR message. If you don't know if it is correct, then TRY IT! Does it do as requested? An error termina...

how do i write commands for errors and warnings in Matlab

You wrote code for an ERROR message. If you don't know if it is correct, then TRY IT! Does it do as requested? An error termina...

2 meses ago | 1

Answered

How to get the expression of a 3d surface

Congratulations! You are the one millionth person to ask this same question. Your reward for this is a one way, unpaid trip to N...

How to get the expression of a 3d surface

Congratulations! You are the one millionth person to ask this same question. Your reward for this is a one way, unpaid trip to N...

2 meses ago | 0

Answered

Failure in initial objective function evaluation. FMINCON cannot continue.

You need to read the examples. Look at the help for fmincon. Why? What is nvars? nvars = 2; nvars is the scalar 2. I assume y...

Failure in initial objective function evaluation. FMINCON cannot continue.

You need to read the examples. Look at the help for fmincon. Why? What is nvars? nvars = 2; nvars is the scalar 2. I assume y...

2 meses ago | 0

| accepted

Answered

Alternating forward and reversed cos function

This may be easier than you think. But since you asked, and had no idea how to do it, it may be harder than you think. DRAT. Now...

Alternating forward and reversed cos function

This may be easier than you think. But since you asked, and had no idea how to do it, it may be harder than you think. DRAT. Now...

2 meses ago | 0

| accepted

Answered

How to calculate R^2 based on external linear equation?

Unfortunately, R^2 is not a completely simple concept when working with an orthogonal regression. To compute a valid R^2, we nee...

How to calculate R^2 based on external linear equation?

Unfortunately, R^2 is not a completely simple concept when working with an orthogonal regression. To compute a valid R^2, we nee...

2 meses ago | 2

Answered

How can i graph these equations?

None of the solutions you tried are correct, because they try to treat these functions as single valued relations. That is not t...

How can i graph these equations?

None of the solutions you tried are correct, because they try to treat these functions as single valued relations. That is not t...

2 meses ago | 0

Answered

Count number of digits after decimal point?

MATLAB does not distinguish between numbers with trailing zeros after the decimal point. That is, 0.25 == 0.250 == 0.250000000. ...

Count number of digits after decimal point?

MATLAB does not distinguish between numbers with trailing zeros after the decimal point. That is, 0.25 == 0.250 == 0.250000000. ...

2 meses ago | 1

| accepted

Answered

Factoring out a smaller equation, using symbolic math, from a larger equation

You were using collect in the wrong way. You were thinking in terms of what you wanted to see INSIDE the parens. Instead, you ne...

Factoring out a smaller equation, using symbolic math, from a larger equation

You were using collect in the wrong way. You were thinking in terms of what you wanted to see INSIDE the parens. Instead, you ne...

2 meses ago | 0

| accepted

Answered

How can I set bounds for ga that change with the values of the optimization variables?

You cannot. Bounds are FIXED constants. They do not vary at all, and the optimizer assumes that as fact. If you have a constrai...

How can I set bounds for ga that change with the values of the optimization variables?

You cannot. Bounds are FIXED constants. They do not vary at all, and the optimizer assumes that as fact. If you have a constrai...

2 meses ago | 1

| accepted

Answered

What do I do to upgrade from MatLab 2013a to run-on MacOS Catalina

What can you do now? Looking at the system requirements page, we see that R2019b is the oldest release supported for Mac OS 10....

What do I do to upgrade from MatLab 2013a to run-on MacOS Catalina

What can you do now? Looking at the system requirements page, we see that R2019b is the oldest release supported for Mac OS 10....

2 meses ago | 0

Answered

how to get convolution for two signals without using conv command

Several ways you could do this. If your signal is represented as a discrete sequence, then just use a double loop, accumulating ...

how to get convolution for two signals without using conv command

Several ways you could do this. If your signal is represented as a discrete sequence, then just use a double loop, accumulating ...

2 meses ago | 0

Answered

Countering error while using interp1 function

Your problem is NOT in interp1. It is in the incorrect use of datetime. Read the error message: Error using datetime (line 597)...

Countering error while using interp1 function

Your problem is NOT in interp1. It is in the incorrect use of datetime. Read the error message: Error using datetime (line 597)...

3 meses ago | 2

| accepted

Answered

Does Matlab have a way to find the formula that defines a sequence?

Things are never as easy as you think. For example, is there a simple difference relation that will generate this sequence: P =...

Does Matlab have a way to find the formula that defines a sequence?

Things are never as easy as you think. For example, is there a simple difference relation that will generate this sequence: P =...

3 meses ago | 2

Answered

Comparison of very large numbers

@Steven Lord said it exactly correct. The problem is not that a tool like ismember rounds anything, nor that ismembertol would h...

Comparison of very large numbers

@Steven Lord said it exactly correct. The problem is not that a tool like ismember rounds anything, nor that ismembertol would h...

3 meses ago | 0