rondeau's articles:

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NDSolve with implicit function 1 23 (4/20/2006 9:29:06 AM) comp.soft-sys.math.mathematica I am trying to numerically solve a differential equation {x'[t]==f[x[t],y[t]], x[0]=a} , where y[t] is the numerical solution to an implicit function g[x[t],y[t]]==0 (not a polynomial). In other words, giv... rondeau

Loop and Lost values - The Sequel 1 21 (4/5/2006 11:16:20 AM) comp.soft-sys.math.mathematica A sequel to my previous message concerning lost values when I ran a For[] loop. I now run a similar program, but with a series of Do[] commands. This time, I can list the results, but some of them will not s... rondeau

Lost Values after For[ ] loop 1 22 (4/5/2006 11:04:11 AM) comp.soft-sys.math.mathematica Here is a problem I find completely baffling. After several days of frustration, I have pin-pointed the failures of my program to the the issue: I run a For[] loop with an iterator I call "t1". The loop is ... rondeau

imposing parameter assumptions 1 24 (10/25/2003 10:47:52 AM) comp.soft-sys.math.mathematica Simple question: How do I impose assumptions on the sign of parameters in symbolic equations and then test for the sign of an expression. Example: suppose I want to test the sign of f[a]=a^-3 if a<0. I trie... drr7