Answered

Can someone explain the concept of B= null(A) in simple words?

Think of A as a vector pointing someplace in a 5 dimensional space. Got that? It points somewhere. Now, in 5 dimensions, we co...

Can someone explain the concept of B= null(A) in simple words?

Think of A as a vector pointing someplace in a 5 dimensional space. Got that? It points somewhere. Now, in 5 dimensions, we co...

1 month ago | 1

| accepted

Answered

How to get more decimal places in my output?

In fact, it does NOT neglect that term. It is in there, just too small for you to see in only 4 decimal places. help format Yo...

How to get more decimal places in my output?

In fact, it does NOT neglect that term. It is in there, just too small for you to see in only 4 decimal places. help format Yo...

1 month ago | 1

Answered

How to remove last characters from String using mod?

It is generally a bad idea to use names for variables that are already useful function names. So here rem is one such bad idea. ...

How to remove last characters from String using mod?

It is generally a bad idea to use names for variables that are already useful function names. So here rem is one such bad idea. ...

1 month ago | 2

| accepted

Answered

Random sampling of elements from an array based on a target condition in MATLAB

Are you looking for an exact match to V1? An approximate sum equal to V1? If so, then how close of a tolerance do you need? Is ...

Random sampling of elements from an array based on a target condition in MATLAB

Are you looking for an exact match to V1? An approximate sum equal to V1? If so, then how close of a tolerance do you need? Is ...

1 month ago | 1

Answered

how to use large numbers

Depending on what you are doing, you can use any of several tools. For example ... The symbolic toolbox: sym(17)^173 ans = 7...

how to use large numbers

Depending on what you are doing, you can use any of several tools. For example ... The symbolic toolbox: sym(17)^173 ans = 7...

1 month ago | 1

| accepted

Answered

is max built in functions

Yes. max is definitely a built-in function. As such, use of it will have been (sadly) outlawed by your assignment.

is max built in functions

Yes. max is definitely a built-in function. As such, use of it will have been (sadly) outlawed by your assignment.

1 month ago | 0

| accepted

Answered

Calling a multivariable system of equations

I think you do not understand functions. And, well, I suppose this is a not uncommon problem for new users. There are at least t...

Calling a multivariable system of equations

I think you do not understand functions. And, well, I suppose this is a not uncommon problem for new users. There are at least t...

1 month ago | 0

Answered

I need to have eigenvalues of this matrix including symbols "m" and "n"

Actually, it is pretty easy, and the solution arrives almost immediately. A=[0 1/sqrt(3*n*m) 1/sqrt(3*n*m) 1/sqrt(3*n*m) 1/sqrt...

I need to have eigenvalues of this matrix including symbols "m" and "n"

Actually, it is pretty easy, and the solution arrives almost immediately. A=[0 1/sqrt(3*n*m) 1/sqrt(3*n*m) 1/sqrt(3*n*m) 1/sqrt...

1 month ago | 0

Answered

How to find integral of this function.

No, that is not going to have any closed form solution. One suggestion in the comments was to try vpaintegral. If it does not ...

How to find integral of this function.

No, that is not going to have any closed form solution. One suggestion in the comments was to try vpaintegral. If it does not ...

1 month ago | 0

| accepted

Answered

how to numerically define 1/x^2+0.4/(60-x)^2

If x is a vector or array, then you are trying to compute element-wise operations. But / and ^ and * are all operators that are ...

how to numerically define 1/x^2+0.4/(60-x)^2

If x is a vector or array, then you are trying to compute element-wise operations. But / and ^ and * are all operators that are ...

1 month ago | 0

Answered

Extrapolating rate constants from reaction data

l,k, m are just scalar symbolic variables. When you write solve(k) for example, it solves the problem k == 0 What is the ...

Extrapolating rate constants from reaction data

l,k, m are just scalar symbolic variables. When you write solve(k) for example, it solves the problem k == 0 What is the ...

1 month ago | 0

Answered

how to use Discretize syntax

Funny. Actually, both of the other answers have missed an important point. While they properly describe how to use discretize, b...

how to use Discretize syntax

Funny. Actually, both of the other answers have missed an important point. While they properly describe how to use discretize, b...

1 month ago | 1

Answered

Using Polyfiti, Polyval, and plotting

Ok, now that I know where you are coming from, I'll pose this as an answer. It looks correct to me. The call to polyfit will cr...

Using Polyfiti, Polyval, and plotting

Ok, now that I know where you are coming from, I'll pose this as an answer. It looks correct to me. The call to polyfit will cr...

1 month ago | 1

| accepted

Answered

all combinations of numbers

It is often true that people decide to do something unimaginably huge, because something small seemed easy enough. Computers are...

all combinations of numbers

It is often true that people decide to do something unimaginably huge, because something small seemed easy enough. Computers are...

1 month ago | 0

Answered

Double for Loop to find root of polynomial

lambda=2; Quadratic_For_Omega_Squared=@(L,M)[1,-(L^2 +2 * M^2 +1 -lambda), +M^2 * (L^2 +M^2 -lambda)]; L=1:-0.1:0; M=1:-0.1:0...

Double for Loop to find root of polynomial

lambda=2; Quadratic_For_Omega_Squared=@(L,M)[1,-(L^2 +2 * M^2 +1 -lambda), +M^2 * (L^2 +M^2 -lambda)]; L=1:-0.1:0; M=1:-0.1:0...

1 month ago | 0

| accepted

Answered

I need to plot hyperbolas with ellipses

Well, first, you need to write down the equation for the hyperbola. Seems silly, or maybe obvious, but you can't do anything wit...

I need to plot hyperbolas with ellipses

Well, first, you need to write down the equation for the hyperbola. Seems silly, or maybe obvious, but you can't do anything wit...

1 month ago | 0

Answered

taylor series expansion for acos(1-x)

Actually, the expansion you ask for does NOT exist. Why not? Because. I hope that is a good enough answer.. ;-) Seriously, the ...

taylor series expansion for acos(1-x)

Actually, the expansion you ask for does NOT exist. Why not? Because. I hope that is a good enough answer.. ;-) Seriously, the ...

1 month ago | 1

| accepted

Answered

Looking for a code in Matlab optimization

No. There is no direct code to do so, at least not that I know of. Should I write it? sigh. But if you spend some time reading,...

Looking for a code in Matlab optimization

No. There is no direct code to do so, at least not that I know of. Should I write it? sigh. But if you spend some time reading,...

1 month ago | 2

| accepted

Answered

How to find the two Y values for my function with one known X value? please help

There must be a million ways. Here is a trivial one. f=@(x,y)2x*y - 6*y - 6*x + 4*x^2 + 6*y^2 - 12; syms Y Ysol = solve(f(2...

How to find the two Y values for my function with one known X value? please help

There must be a million ways. Here is a trivial one. f=@(x,y)2x*y - 6*y - 6*x + 4*x^2 + 6*y^2 - 12; syms Y Ysol = solve(f(2...

1 month ago | 0

Answered

After a condition of X amount of iterations, if fail then do another function?

I'd echo the point made by Rik, that a variable named true, that may in fact be false is a really, really bad idea. It is asking...

After a condition of X amount of iterations, if fail then do another function?

I'd echo the point made by Rik, that a variable named true, that may in fact be false is a really, really bad idea. It is asking...

1 month ago | 2

| accepted

Answered

if year is divisible by 400 - then is a leap year if year is divisible by 100 - then is not a leap year if year is divisible by 4 - then is a leap year

Hint: What does the mod function tell you? Specifially, if mod(Y,4)==0, what would that tell you? Similarly, what would it tell ...

if year is divisible by 400 - then is a leap year if year is divisible by 100 - then is not a leap year if year is divisible by 4 - then is a leap year

Hint: What does the mod function tell you? Specifially, if mod(Y,4)==0, what would that tell you? Similarly, what would it tell ...

2 months ago | 1

Answered

how to program integration method with a variable step ?

Note that trapz allows you to provide any spacing your heart desires, because you can give it a vector of values for x and y. So...

how to program integration method with a variable step ?

Note that trapz allows you to provide any spacing your heart desires, because you can give it a vector of values for x and y. So...

2 months ago | 0

| accepted

Answered

Using a For Loop to calculate the pi for a taylor series

I had to look online to find a formula for pi that used an alternating sum of reciprocals of cubes of odd numbers. There had to ...

Using a For Loop to calculate the pi for a taylor series

I had to look online to find a formula for pi that used an alternating sum of reciprocals of cubes of odd numbers. There had to ...

2 months ago | 2

| accepted

Answered

nested calls to fmincon

Um, yes, you can use nested calls to fmincon, but with a huge, massive caveat. fmincon requires differentiability of the object...

nested calls to fmincon

Um, yes, you can use nested calls to fmincon, but with a huge, massive caveat. fmincon requires differentiability of the object...

2 months ago | 1

Answered

How to draw a 3D graph with constraints?

The simple answer is to just use meshgrid. [x,y] = meshgrid(linspace(0,1,100)); keepind = (x + y) <= 1; x(keepind) = NaN; ...

How to draw a 3D graph with constraints?

The simple answer is to just use meshgrid. [x,y] = meshgrid(linspace(0,1,100)); keepind = (x + y) <= 1; x(keepind) = NaN; ...

2 months ago | 1

| accepted

Answered

How to create a complex normal i.i.d.?

Is it correct? It is what it is. You are creating a rotationally symmetric complex random variable, where if we define the varia...

How to create a complex normal i.i.d.?

Is it correct? It is what it is. You are creating a rotationally symmetric complex random variable, where if we define the varia...

2 months ago | 0

| accepted

Answered

How to write a function for this simple purpose?

Here are other approaches that are nicely vectorized, but do not require you to set explicit tests for each bin. For example, su...

How to write a function for this simple purpose?

Here are other approaches that are nicely vectorized, but do not require you to set explicit tests for each bin. For example, su...

2 months ago | 1

Answered

Matlab Solver - fmincon, minimization problem with constraint

" Q1. Although the weight for w1 is greatly increased, there is a very small tendency to minimize the function for J1. What ...

Matlab Solver - fmincon, minimization problem with constraint

" Q1. Although the weight for w1 is greatly increased, there is a very small tendency to minimize the function for J1. What ...

2 months ago | 0

Answered

Deconvolution of a Convolved Gaussian and Expoential curve

As I recall from long ago, numeical deconvolution is a variation of a first kind integral equation. https://epubs.siam.org/doi/...

Deconvolution of a Convolved Gaussian and Expoential curve

As I recall from long ago, numeical deconvolution is a variation of a first kind integral equation. https://epubs.siam.org/doi/...

2 months ago | 0

Answered

How can i creat varibales, varible1, viable2, into loop

Simple answer, don't do it. You even state that you are a beginner. So instead, learn to use MATLAB properly. Use vectors, use a...

How can i creat varibales, varible1, viable2, into loop

Simple answer, don't do it. You even state that you are a beginner. So instead, learn to use MATLAB properly. Use vectors, use a...

2 months ago | 0