Community Profile # raha ahmadi

##### Last seen: 8 days ago
10 total contributions since 2020

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Question

Getting Nan after using expm
Hi H dont know why I get Nan in situatin A but not in B. Thanks in advance % situation A r=[1e5,0,0; 0,-2e5,0; 1,1,...

14 days ago | 1 answer | 0

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answer

Question

Taking a long time to run, what is the problem?
Hi , I really nead help with this code. I dont know what makes it so long. I want to solve a PDE by extending it based on orthog...

24 days ago | 0 answers | 0

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answers

Question

smoothing a curve efficiently
Hi , I need to make my curve smooth and I use all of the method simoltaneouly but my data need to be more smooth. how can I ...

1 month ago | 2 answers | 0

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answers

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calculation of inverse matrix
I need to calculate the inverse matrix of P2 but I dont know my matrix is sparse or not. also I knew that this problem was solv...

2 months ago | 0 answers | 0

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Reference to non-existent field although the field is determined
Hi, I m working on a POS algorithm for optimizing an elemet of a matrix which is produced of multiplication of almost 1000 matr...

4 months ago | 1 answer | 0

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answer

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Undefined function or variable for struct variable
I have defined 'createModel' function but when I call struct variables from command window , for example model.pmin(5) or un...

4 months ago | 0 answers | 0

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Question

Problem with solving the inhomogeneous systems of ODE
Hi, I 'm trying to solve a system of ODE neumerically, in these equaions I have a funcion of time ,Pc, which was calculated sepe...

11 months ago | 0 answers | 0

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Question

numerical solution of a system of ODE which is not in standard form
Hi I' m wondering can MATLAB solve a system of ODE of these forms numerically? H11*dydt+H12*dxdt=H13 H21*dydt+H22*dxdt=H23...

12 months ago | 2 answers | 0

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answers

Answered
ode45 solver code for solving a system of three coupled equations does not work
Thank you so much for your great help with Best wishes

12 months ago | 0

Question

ode45 solver code for solving a system of three coupled equations does not work
Hi , I have a system of three ordinary equations and want to solve them numerically. I wrote them with two methods but they hav...

12 months ago | 2 answers | 0

answers