# Elia Paini

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**Content Feed**

Question

How to get this while cycle?

Hi, I'm trying to get a while cycle which checks convergence every iteration. Within the cycle, I'm solving a system which ret...

2 mesi ago | 2 answers | 0

### 2

answersQuestion

How can I do this iteration?

Hi, I have a simple question related to a problem. I have to make an iterative code which updates values of some hypothesized ...

3 mesi ago | 1 answer | 0

### 1

answerQuestion

How to solve this simple matricial system?

Hi, how can I solve this simple system in Matlab? A*u = h*G A: 4x4 u: unknowns vector, but it should be 4x1 h: scalar G...

4 mesi ago | 2 answers | 0

### 2

answersQuestion

How can I "simplify" the resolution of this system of odes?

Hi, as you can see in the attached file, I've a system of second order ODEs with BCs. I tried to solve it with bvp4c, firstly c...

5 mesi ago | 0 answers | 0

### 0

answersQuestion

How to solve a system of ODEs with BCs, without bvp4c?

Hi, I solved a system of ODEs with BCs, by using bvp4c. The system is a bit complicated, consisting of 21 non linear equations,...

5 mesi ago | 0 answers | 0

### 0

answersQuestion

How can I optimize initial guess of a solution?

Hi, I solved a system of non linear ODEs with bvp4c. The system is a bit complicated, since it contains 17 equations with 17 va...

5 mesi ago | 0 answers | 0

### 0

answersQuestion

How can I solve this system of ODEs involving both time and space?

Hi, I have this complicated system of ODEs (see attached file), whose equations depend on time and space. I have no idea how ...

5 mesi ago | 1 answer | 0

### 1

answerQuestion

How can I insert this boundary condition?

Hi everyone, I have an ODE system with several variables, like this: y1' = f (y1,y2) y2' = g (y1,y2) I'm solving it with...

6 mesi ago | 0 answers | 0

### 0

answersQuestion

How to solve this ODE system which involves these integrals?

Hi, I'm trying to solve the following (simplified) ODE system (see attached file). Where X1 and X2 are my functions, z is the i...

6 mesi ago | 1 answer | 0

### 1

answerQuestion

How can I improve accuracy using bvp4c?

Hi, I solved an ODEs system with BCs. The system is a bit complicated, it consists of 10 second order equations (thus, 20 first ...

6 mesi ago | 0 answers | 0

### 0

answersQuestion

How to plot 3 graphs in 1 figure?

Hi, I want to plot 3 graphs in one figure, arranging them two on the left and one on the right. With subplot, I managed to arra...

6 mesi ago | 1 answer | 0

### 1

answerQuestion

How should I get multiple solutions related to different BCs in this script?

Hi, I'm solving a system of ODEs with BCs, with bvp4c function. My simplified script is as follows: rmesh = ... ...

6 mesi ago | 0 answers | 0

### 0

answersQuestion

What does it represent the second vector in solinit?

Hi, I solved a system of ODEs second order with BCs with bvp4c. I have 8 variables (4 are the functions I'm interested, y(x), ...

6 mesi ago | 0 answers | 0

### 0

answersQuestion

Questions about bvp4c solution

Hi, I solved correctly a system of ODE second order with BCs, with the instruction bvp4c. However, I have some questions about ...

6 mesi ago | 1 answer | 0

### 1

answerQuestion

Solving a system of ODE with BCs

Hi, I'm trying to solve a system of 2 ODE with boundary conditions. The integration variable is r, which is the sferical coord...

6 mesi ago | 1 answer | 0

### 1

answerQuestion

Solving an ODE second order

Hi, I have to solve an ODE second order in Matlab, like this: a*y''(x)=b Where x is the space coordinate, a and b are costan...

6 mesi ago | 1 answer | 0

### 1

answerQuestion

How can I use ode15s with a tspan of two elements?

Hi, I'm using the function ode15s to solve ODE. I don't understand why, with a vector of time with only 2 elements, Matlab autom...

7 mesi ago | 1 answer | 0