# ttopal

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Question

How can I find/plot mesh grid points outside an arbitrary contour?

Hi, I am trying to calculate Green's function using a boundary and a mesh grid with this code: N=128 theta=2*pi*(0:N-1)/N;...

6 years ago | 0 answers | 0

### 0

answersQuestion

How to calculate normal to a point on random contour ?

Hi all, I am trying to automate a calculation to find points in the vicinity of a point using its normal to the contour. For...

6 years ago | 2 answers | 0

### 2

answersHow can I create a fine contour from set of points?

Using @KSSV answer this works a treat: x1=[0,0] ; x2=[8,-4] ; x3=[8,4] ; x4=[0,0] ; P = [x1 ; x2 ; x3 ; x4...

6 years ago | 0

Question

How can I create a fine contour from set of points?

Hi, I am creating different contours using (x,y) coordinate of points. Say if i want to create a triangle I would use ...

6 years ago | 2 answers | 0

### 2

answersQuestion

mex file crashes in loop

Hello, I have a problem calling my mex file inside a loop. After the first run, it creates myMexFunction.mexw64, and after 5-...

6 years ago | 1 answer | 0

### 1

answerQuestion

How can I run my first Mex function?

Hi, I am trying to run a part of my matlab code in c++. Following this example: <https://au.mathworks.com/help/matlab/mat...

6 years ago | 1 answer | 0

### 1

answernested for loops conditions

You are actually not using matlab syntax. And if you are comparing a value to list of values ( like i and -3,-2,0,8) you might w...

6 years ago | 0

Question

Extremely slow nested for loop

Hi, I have number of functions that I use to find roots to Neumann problem. One of the functions contains nested for loops w...

6 years ago | 1 answer | 0

### 1

answerQuestion

Recreating a contour using coordinate points

Hi all, I am reading contour points from an external file, which are not stored in order. I want to set a start point and ...

7 years ago | 1 answer | 0

### 1

answerQuestion

how i can vectorize this code using bsxfun or meshgrid?

Hi, I am trying to vectorize this code, but I dont know how to start it, I read the help files for both bsxfun and meshgrid...

7 years ago | 1 answer | 0

### 1

answerQuestion

points on a contour and meshgrid

Hi, I have a set of points on a contour, and a meshgrid of points. I need to use all the points in this meshgrid except when ...

7 years ago | 1 answer | 0

### 1

answerinverse power method for smallest eigenvector calculation

Here is another version of inverse iteration method, where if statement works fine. function [x,iter] = invitr(A, ep, ...

7 years ago | 0

| accepted

Question

inverse power method for smallest eigenvector calculation

Hi, I need to calculate the smallest eigenvector of a matrix. I use eigs(A,1,'sm') and I would like to compare the result wit...

7 years ago | 2 answers | 0

### 2

answersQuestion

Error with bwtraceboundary function

Hi all, I have a function where I have a set of x,y coordinates for points to a contour as input. I calculate its derivatives...

7 years ago | 1 answer | 0

### 1

answerHow to get fsolve return number of iterations

Okay. So it turns out it needs this; [x,fval,exitflag,output] = fsolve(fun,x0,options) output.iterations you...

8 years ago | 0

| accepted

Question

How to get fsolve return number of iterations

Hi all, Yet another fsolve question. I am trying to compare now various root finding functions I have as well as fsolve. ...

8 years ago | 1 answer | 0

### 1

answerQuestion

multiple logical operators in if statement

Hi, I have a quick question. Is it possible to write multiple logical conditions in if statement like this; if...

8 years ago | 2 answers | 0

### 2

answersNorm of step in fsolve

So I have found that my own root finder with improvement based on Newton-Raphson method with numerical approximations to the der...

8 years ago | 0

| accepted

Question

how to improve performance? cpu vs ram vs operating system

Hi, I have recently started using matlab ( any type of programming actually) and I dont know if i need to buy a new laptop. I...

8 years ago | 2 answers | 0

### 2

answersQuestion

Norm of step in fsolve

Hi, I have yet another fsolve question. Norm of step in fsolve seems to be able to show me false roots (which i have far too ...

8 years ago | 2 answers | 0

### 2

answersQuestion

Finding all real roots of complex function with fsolve

Hi, Is it possible to force fsolve to return only real roots of a complex function? I have this small code; myfun ...

8 years ago | 3 answers | 1

### 3

answersQuestion

meshgrid or ngrid?

Hi, I have lately started to use meshgrid and ngrid thanks to the answer to my previous question. But I can not find a way to ...

8 years ago | 1 answer | 0

### 1

answerQuestion

Nested for loops newbie question

Hi, I know this might be nested for loops question 1000. I have read most of other posts, even the newbie questions seems lit...

8 years ago | 1 answer | 0

### 1

answerQuestion

why complex value appears in this array

Hi guys. I am quite new to matlab and I have been spending all my day to figure out why this simple code wont work. I am s...

8 years ago | 1 answer | 0