[Tutor] wave equation boundary conditions

Hi, I have written some code which solve's the 2d wave equation (code is below). It seems to work, however when the wave reaches the boundaries it reflects off them and I would like to remove this effect. Does anyone know of a method to do this? Also, I would like to run it over a large area, but w

Re: [Tutor] problem editing modules and defs

Hi again, sorry if that wasnt clear. I am using the ipython interpreter to debug scripts. I have a function:-) saved as part of a module called daves_modules.py. import numpy as np def find_nearest(array,value): idx=(np.abs(array-value)).argmin() return array[idx], idx

[Tutor] problem editing modules and defs

Hi, I am new to python and have made a couple of definitions. I imported them and they worked ok except for one which gave me the error "NameError: global name 'np' is not defined". I then edited my script for the def to include "import numpy as np" saved it and imported the def again. However

[Tutor] problem editing modules and defs

Hi, I am new to python and have made a couple of definitions. I imported them and they worked ok. I they worked except for one which gave me the error "NameError: global name 'np' is not defined". I then edited my script for the def to include "import numpy as np" saved it and imported the def

Re: [Tutor] Solve wave equation

. Anyone know the best way to go about this? thanks, D Original Message Subject:Re: [Tutor] Solve wave equation Date: Thu, 23 Feb 2012 15:24:45 + From: David Craig To: tutor@python.org Hooray it works, thanks On 02/23/2012 01:39 PM, Ken Oliver wrote: Do you

Re: [Tutor] Solve wave equation

Hooray it works, thanks On 02/23/2012 01:39 PM, Ken Oliver wrote: Do you really want dt = 1**-4 or would 10**-4 be better -Original Message- From: David Craig Sent: Feb 23, 2012 7:57 AM To: tutor@python.org Subject: [Tutor] Solve wave equation Hi, I am trying to write some code that

[Tutor] Solve wave equation

Hi, I am trying to write some code that will solve the 2D wave equation by the finite difference method, but it just returns an array full of zeros and NaN's. Not sure where I am going wrong, the code is attached so if could someone point me in the right direction I'd appreciate this. Thanks D

Re: [Tutor] Create a table by writing to a text file.

Thanks everyone, was able to get what I wanted from '/t' but I'm sure the other formatting options will be useful in future. @Peter a = [[]] * 3 >>> a [[], [], []] >>> a[0].append(42) >>> a [[42], [42], [42]] you had me worried for a minute, but a = [[]] * 3 a[0]=[1,2,3] a [[1, 2, 3], [

[Tutor] Create a table by writing to a text file.

Hi, I have created a list of containing strings that represent distances between many different points and would like to display the results in a table. I have been trying to write them to a text file but it is difficult to organise them into rows and columns with appropriate spacing to make it

[Tutor] return integer from function

Hi, I have a function that calculates the distance between two points on a sphere. It works but I cant get it to return a float for use in another script. Anyone know how I do that?? The function is below, Thanks, D import math def distance_on_unit_sphere(lat1, long1, lat2, long2): # Con

[Tutor] ipython trouble with editor

Hi, I use emacs with ipython (or I would like to) on a GNU/linux machine. To be able to use it from the ipython shell through %ed I added the following lines to my .bashrc file, export LESS="-R" export EDITOR=emacs this seemed to work as when I try %ed filename it opens and is editable in th

[Tutor] How to make def where arguments are either stated when called or entered via raw_input

Hi, I'm trying to write a function that will either take arguments when the function is called, such as myFunc(x,y,z) or if the user does not enter any arguments, myFunc() the raw_input function will ask for them. But I dont know how to check how many arguments have been entered. My code is be