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# Mehdi

Last seen: 8 days ago Active since 2013

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Why Matlab could not solve a set of linear differential equations with initial conditions through dsolve?
Hi, Where is the problem in my codes to solve a set of linear differential equations with initial conditions? Any suggest? ...

27 days ago | 1 answer | 0

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Question

How to comute double integral of a long symbolic vector through parallel computing in Matlab?
Is there other ways to comute the double integral of a long symbolic vector through parallel computing in Matlab, except parfor?...

2 months ago | 1 answer | 0

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Any comment to speed up the speed of caculation of symbolic loops having Legendre polynomials?
syms eta__2 zeta__2 II=12;JJ=11;M=22; Hvs2 = ((5070602400912917605986812821504*(zeta__2 + 2251799813683713/2251799813685248)^2...

3 months ago | 2 answers | 0

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Question

Why fsurf show anything for my function?
I have a two variable symbolic function. I want to plot it through fsurf, but nothing happened. Where is the problem? clear sy...

3 months ago | 2 answers | 1

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How to assign a symbolic equation to previously defined numeric matrix?
I have a vector that at the first stage it contains numeric values, but later must be assigned by symbolic equations. How is it ...

3 months ago | 0 answers | 0

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Simplest way to create a unit vector in Matlab?
I am trying to find the simplest way to create a unit vector with arbitrary number of elements in Matlab. for example V=[1 1 1...

3 months ago | 1 answer | 0

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Any comment to speed up the sum calculation of a function which includes legendre polynomials?
Any comment to speed up the sum calculation of a function which includes legendre polynomials? f(x,y)=sum(sum(legendreP(i, x)*l...

3 months ago | 1 answer | 0

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Question

I have a loop command in Maple, do you know how to write it in Matlab?
I have a loop command in Maple, do you know how to write it in Matlab? for k to 11 do X[k+1] := eval(V-G1 . EQ, Equate(V, X[k...

3 months ago | 1 answer | 0

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Question

How to assign a symbolic matrix to another new matrix?
clc clear syms t ddq=zeros(4,11);%can not be deleted ddq(1:4, 1)=[sin(25*t); 55*sin(25*t);65*sin(25*t);0]

3 months ago | 1 answer | 0

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Question

What is the easiest way to import a text matrix into Matlab?
HI, I exported a symbolic matrix from Maple as a text file, and now want to import it to Matlab. What is the easiest way to im...

3 months ago | 1 answer | 0

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Question

What is the easiest way to calculate the triple integrate of a symbolic vector numerically without using for loop?
What is the easiest way to calculate the triple integrate of a symbolic vector with arbitrary length numerically without using f...

3 months ago | 0 answers | 0

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Question

What is the easiest way to calculate the triple definite integral of a symbolic vector over arbitrary domain without using for loop?
What is the easiest way to calculate the triple integral of a symbolic vector over arbitrary domain without using for loop? e,g,...

3 months ago | 1 answer | 0

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What is the best and quick way to find the intersections points set of two 3d surfaces?
Thanks All for the answers. I want to put this codes in a loop which changes f sequentially. There are situations where there ...

3 months ago | 0

Question

What is the best and quick way to find the intersections points set of two 3d surfaces?
Hi, I am looking for the easiest best and quick way to find the intersections points of two surfaces in which the points for ea...

3 months ago | 1 answer | 0

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Question

How to find the coefficient matrix of a set of nonlinear equations?
I want to find the coefficient matrix (A) of the following equations: f1 = (a+2*b+c+5*d)^3; f2 = (3*a+b+4*c+d)^3; f3 = (a+b+5...

9 months ago | 2 answers | 0

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How to plot several 3D funztions (Z_n=f_n(x,y) with arbitrary intervals for each of them in one coordinate system?
I have two functions (Z1=f(x,y) and Z2=f(x,y)) want to plot in one coordinate system but with different intervals interval_Z1=[x...

11 months ago | 1 answer | 0

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What is the easiest and accurate way in Matlab to find the eigenvalues and eigenvectors of a problem that do have some zero diagonal elements?
How to find the eigenvalues and eigenvectors of a problem that have some zero diagonal elements which dont have the usual form o...

11 months ago | 0 answers | 0

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Question

How the MSC ADAMS-Simulink interface works in every time step?
Does anyone know how the MSC ADAMS-Simulink interface works in every time step? Which integrator does the ADAMS use during this ...

3 years ago | 0 answers | 1

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Question

What is the best way to calculate multiple summations expression in Matlab?
What is the best way to calculate following expression in Matlab? Note U and V are known but q's are unknown (symbolic)

4 years ago | 0 answers | 0

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Question

How I compute multiple sum in matlab for 4D matrix?
How I compute multiple sum in matlab for 4D matrices as below? U and V are 4D matrices. <<https://www.mathworks.com/matlabce...

4 years ago | 1 answer | 0

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Question

Why matlab returns inaccurate response for rank of my matrix?
This is my matrix: A= 6.07787530038946e+15 0 0 0 0 0 0 0 0 6.07787530038946e+15 0 0 0 0 0 0 0 0 6.07787530038946e+15 0 0 ...

5 years ago | 4 answers | 0

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What methods do you recommend to solve very ill conditioned general eigenvalue problem with Matlab?
Suppose we want to solve following attached general eigenvalue problem in which the matrices K11, M11 are symmetric, positive de...

5 years ago | 0 answers | 0

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Does anybody knows how eig(A,B) command in Matlab computes the eigenvalues?
Does anybody knows how eig(A,B) computes the eigenvalues of AX=lambdaBX, regardless of A and B are invertible or no? What about...

5 years ago | 0 answers | 1

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Question

How to find eigenvalues of problem that dont have the form of standard eigenvalue problem?

5 years ago | 2 answers | 0

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How to find a linear parameter within a matrix by khowing some of its eigenvalues?
My matrix have the form of syms s A=rand(1000); B=s*rand(1000); C=rand(1000); M=[A,B;B,C]; I think the problem is clea...

5 years ago | 0

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Question

How to find a linear parameter within a matrix by khowing some of its eigenvalues?
Note the order of Matrix is 1000*1000. <</matlabcentral/answers/uploaded_files/74080/jkjkjkjk.jpg>>

5 years ago | 2 answers | 0

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Question

Why I receive Error: Expression or statement is incomplete or incorrect?
for a simple problem I get this error: >> A=rand(12); >> Y=sqrtm(A): ??? Y=sqrtm(A): | Error: Expression or ...

6 years ago | 1 answer | 0