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2014-12-09 00:21:25 +0100 | asked a question | Find oscillations of a vibrating string by solving the 1-D wave equation Find oscillations of a vibrating string by solving the 1-D wave equation (1/v^2)(d^2 u/dt^2) - (d^2 u/dx^2) = 0 for u(x,t) in the interval -1<=x<=1 and t>0 with initial conditions u(x,0) = (1- abs(x))/2 and du/dt @ t=0 and boundary conditions u(-1,t)=u(1,t)=0 Plot u(x,t) at different points in time t. Question: How do I go about this and how do I use sage to solve this. Thanks. |

2014-11-20 02:29:47 +0100 | commented question | How to solve Fourier transform problem using Sage? @timonteli Are you a bot? If so, get off the boards. Get a life. Oh wait, you can't. You're a bot! |

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2014-11-13 02:44:05 +0100 | commented question | Find and plot the Fourier transform of the Ricker wavelet @tmonteil so how do I plot it? I don't know what function to use to plot it. |

2014-11-13 02:21:22 +0100 | asked a question | Solve the following system of ODE's and plot its solution Solve the following system of ordinary differential equations d^2x/dt^2 + 5x + 2y = 0 d^2y/dt^2 + 2x + 8y = 0 with initial conditions x(0)=1, y(0)=2, x'(0)=-4, y'(0)=2 and plot its solution as a curve in the {x,y} plane. |

2014-11-04 05:18:08 +0100 | answered a question | How to solve Fourier transform problem using Sage? I don't know? Are you taking a class with Sergey? |

2014-11-04 05:14:32 +0100 | asked a question | Find and plot the Fourier transform of the Ricker wavelet - The Ricker wavelet, also known as the Mexican hat wavelet, is a popular representation of seismic signals. The Ricker wavelet r(t) is defined as the second derivative of the Gaussian
r(t)=−d2dt2g(t), where g(t)=e−a2t2. (a) Find and plot the Fourier transform of the Ricker wavelet. (b) Find the peak frequency: the frequency of the maximum of the Fourier spectrum. (c) Find the apparent frequency: the frequency corresponding to the period between two minima in the time domain. |

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