# Imene Yed

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**Content Feed**

Question

how to initialize variables ?

Hi I want to initialize my variable calcul_Pression but it doesn't seem to work . clear all,clc [t,n]= pfe(); if t=0 ...

4 months ago | 1 answer | 0

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answerQuestion

How to adjust the accuracy in graphs ?

Hi,I plot a graph ,I Wan to display on the graph on each (X,Y) couple, the real value of X ,I mean for exemple my data is like...

4 months ago | 1 answer | 0

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answerQuestion

Import data and plot

Hi,I'm trying to plot import my data using the import tool ,then I want to plot ,here is what I got the data couldn't appear on ...

4 months ago | 1 answer | 0

### 1

answerQuestion

Initial conditions problem ODE15S

Hi ,here is my code if someone can help me to set initial conditions(densities IC) without changing the time so that I can have...

4 months ago | 1 answer | 0

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answerQuestion

Error using call_myequations Too many input arguments.

Hi I divided my script into 4 script: parameters.m function k= parameters %constantes ::: %temperature T=17000...

5 months ago | 1 answer | 0

### 1

answerQuestion

Invalid expression. When calling a function or indexing a variable

Hi, I'm trying to name the variables of my function n(1)=[C]. n(2)= [C+].. but it doesnt seem to work function dndt = myequati...

5 months ago | 1 answer | 0

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answerQuestion

errors in calling function

Hi,I'm trying to call the myequation in another script ,here is my first script: clear all,clc %constantes ::: %temperature ...

5 months ago | 2 answers | 0

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answersQuestion

calling functions in other scripts

Hi, I want call this function : classdef functioncontainer methods function res = func(t,n) ...

5 months ago | 1 answer | 0

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answerQuestion

ODE45 and expr function

Hi, I have this problem where I get only the last equation that is executed in the program (%N ) (the expr equations) and I want...

5 months ago | 0 answers | 0

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answersQuestion

calling script in another script

Hi , I want to use a script in another script .

5 months ago | 1 answer | 0

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answerQuestion

unable to write file permission denied

I'm trying to put an output by using: save expr.txt t expr_at_i -ascii how can I allow the permission Unable to write file...

5 months ago | 1 answer | 0

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answerQuestion

Solving ODE and using conditions

Hi, after resolving my ODE of n variables I want to write a code to verifiy for exemple if this condition is correct : n(1)(t=...

5 months ago | 1 answer | 0

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answerQuestion

Error in ode45

Hi clear all,clc %constantes:: %temperature T=17000 %constante k: recombinaison radiative k1=2.36 *(1e-12)*(T/300)^(-0.29)...

5 months ago | 1 answer | 0

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answerQuestion

definitions in a script must appear at the end of the file.

Hi function dndt=imene2022(t,n,) dndt=zeros(43,1) %Chemin C dndt(1)= k1*n(2)*n(32)+k15*n(5)*n(9)+k16*n(5)*n(24)... +k33*n(4...

5 months ago | 1 answer | 0

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answerQuestion

warning: Solving was not successful. The iterative integration loop exited at time t = 0.000000 before the endpoint at tend = 0.001000 was reached

Hi,I'm trying to solve a big system of ODE here is my code with ODE45 k1 k2 k3... F=@(t,n)([k1*n(2)*n(42)+k15*n(5)*n(9)+...

5 months ago | 1 answer | 0

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answerQuestion

Abstrol,Reltol,,normcontrol and refine

Hi, What do we mean by Abstol,Reltol and refine ,is it all about the accuracy of the ODE solver??I'm new to this domain thank y...

5 months ago | 0 answers | 0

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answersQuestion

error: IDASolve failed

Hi I was trying to resolve a large ODE system with ODE45 ,the calculus didn't stop and it took more than 12hours ,so I changed t...

5 months ago | 1 answer | 0

### 1

answerQuestion

vertical dimensions mismatch ode45

I'm trying to solve a system of ODE with 43 equations and 156 constants ,here is my code: clear all,clc %temperature T=17000...

5 months ago | 1 answer | 0

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answerQuestion

ode45 invalid call to script octave 6.1.0(GUI)

I'm trying to run a program of a big system of odes with 43 equations and 165 constants,here is a preview of my code: script1:...

5 months ago | 0 answers | 0