[Maxima] two other quick questions...
tow_force at hotmail.com
Tue Jul 22 10:52:41 CDT 2008
OK - I have raised a bug report (http://sourceforge.net/tracker/index.php?func=detail&atid=104933&aid=2024777&group_id=4933).
If I may, I'd like to ask to ask two quick questions which I haven't found in the manual:
1. in the Windows version, there a way to start xMamima with the browser off by default?
2. is there a way to auto-run some commands when xMaxima loads without having to use a batch or file command (I want to automatically load functions to do trigonometry in degrees, and to set display2d to false, since I often paste my results as text, for example)?
Thanks for your help - and apologies if these I covered in the manual but I didn't see them.
Date: Tue, 22 Jul 2008 09:30:14 -0400From: macrakis at alum.mit.eduTo: tow_force at hotmail.comSubject: Re: [Maxima] find_root errorCC: maxima at math.utexas.edu
Thanks for the bug report. Sorry Maxima gets the wrong answer here.I'm pretty sure that the problem is that Maxima simplifies (655/656)^n -> 655^n/656^n (which is correct), then tries to evaluate that expression for various float values of n. For n>109 or so, the intermediate values are IEEE Inf's, and so the quotient is an IEEE NaN. Unfortunately, Maxima doesn't know how to handle IEEE Inf/NaN, and even worse, does not signal an error to indicate this.It is also embarrassing that Maxima can't solve (655/656)^n=1/2 symbolically.Could you please submit this bug to our bug tracking system? (Use bug_report()$ for instructions.)Thanks, -s
On Tue, Jul 22, 2008 at 8:30 AM, Tawny Owl <tow_force at hotmail.com> wrote:
I am using Maxima 5.15.0 under Windows. find_root((655/656)^n = 0.5, n, 1, 1000) gives 114.8, which is completely wrong. Fortunately, I checked the answer (always a good habit, I know!). Either of the following expressions give the correct answer, which is 454.4 find_root(float(655/656)^n = 0.5, n, 1, 1000);float(log(0.5)/log(655/656));
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