Imene Yed

Last seen: plus de 4 ans il y a | Actif depuis 2021

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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 ...

plus de 4 ans il y a | 1 réponse | 0

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Question

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...

plus de 4 ans il y a | 1 réponse | 0

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Question

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 ...

plus de 4 ans il y a | 1 réponse | 0

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Question

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...

plus de 4 ans il y a | 1 réponse | 0

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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...

plus de 4 ans il y a | 1 réponse | 0

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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...

plus de 4 ans il y a | 1 réponse | 0

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Question

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 ...

plus de 4 ans il y a | 2 réponses | 0

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Question

calling functions in other scripts
Hi, I want call this function : classdef functioncontainer methods function res = func(t,n) ...

plus de 4 ans il y a | 1 réponse | 0

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Question

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...

plus de 4 ans il y a | 1 réponse | 0

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Question

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

plus de 4 ans il y a | 1 réponse | 0

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Question

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...

plus de 4 ans il y a | 1 réponse | 0

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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=...

plus de 4 ans il y a | 1 réponse | 0

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Question

Error in ode45
Hi clear all,clc %constantes:: %temperature T=17000 %constante k: recombinaison radiative k1=2.36 *(1e-12)*(T/300)^(-0.29)...

plus de 4 ans il y a | 1 réponse | 0

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Question

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...

plus de 4 ans il y a | 1 réponse | 0

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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)+...

plus de 4 ans il y a | 1 réponse | 0

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Question

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...

plus de 4 ans il y a | 1 réponse | 0

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Question

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...

plus de 4 ans il y a | 1 réponse | 0

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Question

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...

plus de 4 ans il y a | 1 réponse | 0

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Question

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:...

plus de 4 ans il y a | 1 réponse | 0

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