Answered

How to use a variable from script in a function that is in another script

Just create your function like this. In my example, k3 and m3 will be assigned, so that you can see how it works. k3 = 3; m3 =...

How to use a variable from script in a function that is in another script

Just create your function like this. In my example, k3 and m3 will be assigned, so that you can see how it works. k3 = 3; m3 =...

20 days ago | 0

Answered

How do I lower an image quality?

There are other ways to lower image quality. Several ideas have already been mentioned. Resize the image, then expand it back u...

How do I lower an image quality?

There are other ways to lower image quality. Several ideas have already been mentioned. Resize the image, then expand it back u...

21 days ago | 1

Answered

I am struggling trying to figure out this code I have it completed but I keep getting errors, can you help?

I need to laugh (sorry, but it is true) every time I see someone claim they have completely written a long piece of code, and cl...

I am struggling trying to figure out this code I have it completed but I keep getting errors, can you help?

I need to laugh (sorry, but it is true) every time I see someone claim they have completely written a long piece of code, and cl...

21 days ago | 0

Answered

Finding intermediate points between two cartesian coordinates in 3D

You cannot find ALL the points between any pair, in any number of dimensions. At best, you can describe the set of all such poin...

Finding intermediate points between two cartesian coordinates in 3D

You cannot find ALL the points between any pair, in any number of dimensions. At best, you can describe the set of all such poin...

23 days ago | 1

| accepted

Answered

How to find the point that resides on a contour that is closest to a known point?

You can't. That is, you cannot use calculus to do this, at least not as it is, not directly. That contour is a set of piecewise ...

How to find the point that resides on a contour that is closest to a known point?

You can't. That is, you cannot use calculus to do this, at least not as it is, not directly. That contour is a set of piecewise ...

24 days ago | 0

| accepted

Answered

i want to solve 3 non linear equations in matlab

You can want anything you want. I, for example, want to see peace in the world, with everyone treating everyone else as an equal...

i want to solve 3 non linear equations in matlab

You can want anything you want. I, for example, want to see peace in the world, with everyone treating everyone else as an equal...

25 days ago | 0

Answered

I need the installer for Matlab R2010b SP1

We cannot help you. Answers does not have software, cannot supply it. The only people who would be able to help you are at MathW...

I need the installer for Matlab R2010b SP1

We cannot help you. Answers does not have software, cannot supply it. The only people who would be able to help you are at MathW...

25 days ago | 0

Answered

problem with genetic algorithm

Clearly, your constraint function is not evaluating as a real number. It is likely complex, based on the error message. (Though ...

problem with genetic algorithm

Clearly, your constraint function is not evaluating as a real number. It is likely complex, based on the error message. (Though ...

28 days ago | 0

Answered

fsolve stopped because the last step was ineffective

This is a common mistake I see being made. You have a problem that has symmetries in it. x(1), x(2), x(3) all play similar parts...

fsolve stopped because the last step was ineffective

This is a common mistake I see being made. You have a problem that has symmetries in it. x(1), x(2), x(3) all play similar parts...

30 days ago | 1

| accepted

Answered

Accessing a vector form a matrix

As an example, given vectors x1,x2,x3. I'll make some up. x1 = randi(10,1,5) x2 = randi(10,1,5) x3 = randi(10,1,5) Combine t...

Accessing a vector form a matrix

As an example, given vectors x1,x2,x3. I'll make some up. x1 = randi(10,1,5) x2 = randi(10,1,5) x3 = randi(10,1,5) Combine t...

1 month ago | 0

Answered

Find the variable inside the LCM argument

You have the expression: B=lcm(nrt,Nr*Nc) where the variables B and nrt are known. The unknown variable is the product nr*...

Find the variable inside the LCM argument

You have the expression: B=lcm(nrt,Nr*Nc) where the variables B and nrt are known. The unknown variable is the product nr*...

1 month ago | 1

Answered

volume calculation from the DelaunayTri(x,y,z) function

Its not THAT hard. You compute the volume of each simplex in the tessellation. Sum the absolute values up. (Since those simplexe...

volume calculation from the DelaunayTri(x,y,z) function

Its not THAT hard. You compute the volume of each simplex in the tessellation. Sum the absolute values up. (Since those simplexe...

1 month ago | 1

| accepted

Answered

is there any reason for this?

Is there any reason? Well, does there absolutely need to be a "reason"? These are a set of choices, made over a period of multip...

is there any reason for this?

Is there any reason? Well, does there absolutely need to be a "reason"? These are a set of choices, made over a period of multip...

1 month ago | 1

| accepted

Answered

find a zero of a two-variable function

A two variable function is a surface. (@Sam Chak said this, but did not take the idea to the point of completion.) But if a sur...

find a zero of a two-variable function

A two variable function is a surface. (@Sam Chak said this, but did not take the idea to the point of completion.) But if a sur...

1 month ago | 0

Answered

Extracting values from optimization variable and setting constraints

Are you saying you want to constraint the sum of absolute values? That is, in context of a LINEAR programming problem? This is ...

Extracting values from optimization variable and setting constraints

Are you saying you want to constraint the sum of absolute values? That is, in context of a LINEAR programming problem? This is ...

1 month ago | 0

| accepted

Answered

I am trying to do multi step math and keep returning the wrong answer

Of course it is wrong. Why did you write 72/13? Why 25/3? I think you don't understand that 8(1/3) is NOT the same thing as ...

I am trying to do multi step math and keep returning the wrong answer

Of course it is wrong. Why did you write 72/13? Why 25/3? I think you don't understand that 8(1/3) is NOT the same thing as ...

1 month ago | 0

| accepted

Answered

Calling GA() with 10 generations 10x vs GA() with 100 generations.

Is there any difference? Of course! Make it more extreme yet. Suppose you were to stop after 1 iteration. ONLY 1. But do it 100 ...

Calling GA() with 10 generations 10x vs GA() with 100 generations.

Is there any difference? Of course! Make it more extreme yet. Suppose you were to stop after 1 iteration. ONLY 1. But do it 100 ...

1 month ago | 0

Answered

Check the result if it is divisible or not

Do you understand that you are using DOUBLE precision arithmetic to compute that mod? Do you understand that 7^2026 is a number ...

Check the result if it is divisible or not

Do you understand that you are using DOUBLE precision arithmetic to compute that mod? Do you understand that 7^2026 is a number ...

1 month ago | 1

| accepted

Answered

Treating ties in a Gaussian Elimination process

Um, max does exactly that. Where is there a problem? x = [1 2 3 4 3 4 1]; [xmax,ind] = max(x)

Treating ties in a Gaussian Elimination process

Um, max does exactly that. Where is there a problem? x = [1 2 3 4 3 4 1]; [xmax,ind] = max(x)

1 month ago | 0

Answered

Matlab editor settings: notify undefined variables

For one example of a scenario where a variable appears to be undefined, yet is properly used, consider the case of a nested func...

Matlab editor settings: notify undefined variables

For one example of a scenario where a variable appears to be undefined, yet is properly used, consider the case of a nested func...

1 month ago | 0

Answered

Trying to determine roots of this polynomial (Det)

k = [1750 -750 0; -750 1250 -500; 0 -500 500]; m = [75 0 0; 0 75 0; 0 0 50]; D=inv(m)*k; syms x I = [x,0,0;0,x,0;0,0,x]; La...

Trying to determine roots of this polynomial (Det)

k = [1750 -750 0; -750 1250 -500; 0 -500 500]; m = [75 0 0; 0 75 0; 0 0 50]; D=inv(m)*k; syms x I = [x,0,0;0,x,0;0,0,x]; La...

1 month ago | 1

Answered

Area using trapezoidal rule

Um, this is WRONG. Basic integral calculus does NOT say a result should never be negative. You are possibly misunderstanding wha...

Area using trapezoidal rule

Um, this is WRONG. Basic integral calculus does NOT say a result should never be negative. You are possibly misunderstanding wha...

1 month ago | 1

| accepted

Answered

Incorrect Coefficients from Symbolic Polynomial Equation Solving

NO. You think there is a unique solution. But that is wrong. syms a1 a2 a3 a4 x; % Define symbolic variables % Define the equ...

Incorrect Coefficients from Symbolic Polynomial Equation Solving

NO. You think there is a unique solution. But that is wrong. syms a1 a2 a3 a4 x; % Define symbolic variables % Define the equ...

1 month ago | 0

| accepted

Answered

How do I extract one point from a piecewise function?

You can define a piecewise function as a symbolic function. For example... syms t M_xy(t) = piecewise(t < 0, 0, t > 0, t); % N...

How do I extract one point from a piecewise function?

You can define a piecewise function as a symbolic function. For example... syms t M_xy(t) = piecewise(t < 0, 0, t > 0, t); % N...

1 month ago | 0

Answered

Why isn't my MATLAB plot not showing up?

A STRONG suggestion is when you do something, to look at the results of your code. Don't just give up when you see nothing in th...

Why isn't my MATLAB plot not showing up?

A STRONG suggestion is when you do something, to look at the results of your code. Don't just give up when you see nothing in th...

1 month ago | 0

Answered

Estimating SQRT of a non-negative number the long way

If you generate an error message, MATLAB stops execution. An error is a failure, and nothing gets past that. However, a warning ...

Estimating SQRT of a non-negative number the long way

If you generate an error message, MATLAB stops execution. An error is a failure, and nothing gets past that. However, a warning ...

1 month ago | 0

Answered

Finding the index k of square nilpotent matrix A

A nilpotent matrix is a square matrix A that has the property that for SOME integer power k, we have A^k is entirely zero. The s...

Finding the index k of square nilpotent matrix A

A nilpotent matrix is a square matrix A that has the property that for SOME integer power k, we have A^k is entirely zero. The s...

1 month ago | 1

| accepted

Answered

Simultaneous Constant Optimisation for Curve Fitting

Do NOT manually search through a 15 dimensional space for a solution. You are just wasting your time, and this is why tools are ...

Simultaneous Constant Optimisation for Curve Fitting

Do NOT manually search through a 15 dimensional space for a solution. You are just wasting your time, and this is why tools are ...

1 month ago | 1

Answered

How do I graph the negative portion of a square root plot?

Since in reality, you have what is called an implicit function, we want to use fimplicit. I might do it like this: fun = @(x,y)...

How do I graph the negative portion of a square root plot?

Since in reality, you have what is called an implicit function, we want to use fimplicit. I might do it like this: fun = @(x,y)...

1 month ago | 1

Answered

How to invert a square matrix using Gaussian elimination

I assume you are forced to use your own code for gaussian elimination here. A bad idea if you are not. NEVER write such code you...

How to invert a square matrix using Gaussian elimination

I assume you are forced to use your own code for gaussian elimination here. A bad idea if you are not. NEVER write such code you...

1 month ago | 0