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Sergio Manzetti


67 2017 이후 총 참여 횟수

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Solving two equations with ODE45
Hi, I used the following command to solve one ODE fun = @(x,y)[y(2);y(3);(y(1)*(1-x^2))]; y0 = [1 0 8]; %y, y', y'' x...

1년 이상 전 | 답변 수: 2 | 0

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How to stretch image in MATLAB online?
Hi, the image resulting from a calculation does not stretch properly across the window. How can this be done? Thanks <</ma...

1년 이상 전 | 답변 수: 0 | 0

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PDE solver ? Which method with FEM on operator matrix?
Hi, I have transformed a recent PDE that was under evaluation here on the forum for a solver, and received some feedback. Some s...

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Change step size in MATLAB for ODE45
Hi, is it possible to avoid this: Warning: Failure at t=-3.000000e+00. Unable to meet integration tolerances w...

1년 이상 전 | 답변 수: 1 | 0

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Numerical Methods for Partial Differential Equations
Hi, I am following this source for numerically solving an own PDE: <https://se.mathworks.com/matlabcentral/fileexchange/65212...

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Is there a tutorial in MATLAB for solving a radial PDE ?
For u(phi, theta): u(0,0)=0 u'(0,0)=0 u''(pi,0)=0 u''(0,2pi)=10

1년 이상 전 | 0

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Is there a tutorial in MATLAB for solving a radial PDE ?
Hi, I have a PDE with radial coordinates that has no analytic solution. Is there a way to generate the plot of the function usi...

2년 이하 전 | 답변 수: 1 | 0

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From ODE45 ODE to """ PDE?
Hi, I just received wonderful assistance from Torsten an the others here in regards with solving with ODE45 the given ODE: y'...

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How do I prepare the following ODE for ode45?
(abs(y))^2 if y is the solution

2년 이하 전 | 0

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Convert an ODE to algebraic equations
Thanks John! Sounds like something I may do in the future. Cheers

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Convert an ODE to algebraic equations
Thanks John, it appears I must have misunderstood the claim of an analytical solution. It was suggested by one of the authors of...

2년 이하 전 | 0

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Haar transform of ODE to systems of algebraic eqns
Hello, I would like to transform the given eqn. y'''+(1-x^2)y=0 to a system of algebraic equations. It appears the Haar wa...

2년 이하 전 | 답변 수: 1 | 0

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Convert an ODE to algebraic equations
Hello, how can I convert a nonlinear ODE of third degree to a set of algebraic equations, which I can at last solve with fsolve?...

2년 이하 전 | 답변 수: 4 | 0

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How do I prepare the following ODE for ode45?
Hello, I would like to solve the following ODE in ode45, but the example's on the site are not describing using higher order der...

2년 이하 전 | 답변 수: 2 | 0

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Solving a third order ODE in MATLAB
It doesn't matter, abs(Y) did not yield results with either methods, while the former, Y, yielded result only in wolfram.

2년 이하 전 | 0

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Solving a third order ODE in MATLAB
I tried this on wolfram, which is the equivalent of this: syms a h Y(x) g x B E T D3Y = diff(Y, 3) eqn = a.*D3Y -0.5...

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Solving a third order ODE in MATLAB
Wolfram alpha, it solves it without any problems.

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Plotting a harmonic function
Hi, I am trying to plot the given function: syms x Z = x.^2 - exp(x)/3 + (2*exp(-x/2)*sin((sqrt(3)*x)/2))/sqrt(3) + ...

2년 이하 전 | 답변 수: 0 | 0

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Solving a third order ODE in MATLAB
Hi, MATLAB is quite about this command: syms a h Y(x) g x B E T D3Y = diff(Y, 3) eqn = a.*D3Y -0.5*x^2*Y == (a...

2년 이하 전 | 답변 수: 4 | 0

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Solving a complex integral
Hi, I have a complex integral to solve, however, there are some weird things here: syms x h a b c n k F = cos....

2년 이하 전 | 답변 수: 1 | 0

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Generating wavepackets in MATLAB
Hi, I am trying to generate wavepackets for a complex function using MATLAB, however, I am not sure on the approach. Does MATLAB...

2년 이하 전 | 답변 수: 1 | 0

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Problem in formatting a function
Hi I am trying to solve this intergral: syms x h h = 1.0545718E-34 f = exp.^(5.06E6.*i.*x+(1./h))+3/4.*exp.^(1./h...

2년 이하 전 | 답변 수: 1 | 0

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Expanding a function in power series
Hi, I would like to expand an exponential function in terms of a power series. How can this be done in MATLAB, where one gets an...

2년 이하 전 | 답변 수: 1 | 0

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How do I use parameters in the upper and lower limits of an intergral?
Hi, I have the following code if true % code end syms h g x C n L p e E C m h = 1.0545718E-34 g = 5.344285879E-2...

2년 이하 전 | 답변 수: 1 | 0

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Unable to plot a wavefunction
Hi, I wonder if any of you can try to plot this and see if they also get a weird bar? syms h g x C t m e p c h = 1.0545...

2년 이하 전 | 답변 수: 1 | 0

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Solve for a normaliztion constant in MATLAB
Hi, I have the following code: if true % code end syms h g x C n L p e E C m N y = - (exp(-(x*(g*1i + (- 2*g^2 + ...

2년 이하 전 | 답변 수: 2 | 0

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Using solve to find unknown Constant in equation
Hi, I tried to use solve in the following fashion: if true % code end syms a x C Csolve = solve(C+pi*cos(a)+pi*i*...

2년 이하 전 | 답변 수: 1 | 0

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Use the Euler relation to split a function into complex and imaginary parts
Hi, I found a thread considering to split a function into Re and Im, and used it's command: if true % code end y =...

2년 이하 전 | 답변 수: 2 | 0

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Proof-checking a ODE solution
Hi, MATLAB online solves this: if true % code end syms a h Y(x) g x B E eqn = (h^2)*diff(Y,x, 2) + (2*i*h*g)*diff...

2년 이하 전 | 답변 수: 1 | 0

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How to set several initial conditions when solving an ODE?
Hi, I have the following ODE: if true % code end syms a h Y(x) g x B E eqn = (h)*diff(Y,x, 2) + (g)*diff(Y,x) + (...

2년 이하 전 | 답변 수: 1 | 0

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