Allan James Payne

Hi David Thanks for your email. Claude is great for diagnosis. I have used Copilot and the google freeby. Thanks for the diagnosis. I will take the project forward now. I attach my previous working version for your interest. Rgds Allan Payne On Thu, Oct 15, 2026 at 12:05 PM David Scherfgen tomasriker@users.sourceforge.net wrote: status: open --> not-a-bug Comment: By Claude: This isn't a Maxima bug. The line rp : region_manager([M, a, Q], -1, 50, ["tol" : 1e-8])$ fails because of errors in the script...

Change in Maxima versions

Hi Jamie Thanks for your email. I will go back to sleep. I am sorry to have caused any trouble . Rgds Allan Payne On Mon, Feb 3, 2025 at 8:47 PM Jaime E. Villate villate@users.sourceforge.net wrote: On 03/02/25 20:33, Allan James Payne wrote: I think that there is a problem witth atvalue which I would have thought provided a value for y(0). and there is a bug. No that is not a bug. It is well documented that atvalue must be used before desolve, because desolve uses the Laplace transform, so the initial...

Hi Jamie Thanks for your comments. I make up a cell as a set of commands which I develop as I go along. I had expected the desolve to give a general solution and the atvalue after the desolve to make it a particular solution so that I can graph the function. I made a simple test to show the problem. I understand the fact that the plot should have a particular solution. I think that there is a problem witth atvalue which I would have thought provided a value for y(0). and there is a bug. Thank you...

Query (%i4) eq: 'diff(y(x), x) = y(x) - x^2 + 1; sol: desolve(eq, y(x)); atvalue(y(x),x=0,1); wxplot2d(y, [x, -5, 5], [ylabel, "y(x)"], [xlabel, "x"], [title, "Solution of the Differential Equation"]); wxplot2d(y(x), [x, -5, 5], [ylabel, "y(x)"], [xlabel, "x"], [title, "Solution of the Differential Equation"]); (eq) 'diff(y(x),x,1)=y(x)-x^2+1 (sol) y(x)=(y(0)-1)%e^x+x^2+2x+1 (%o3) 1 plot2d: unknown function: y -- an error. To debug this try: debugmode(true); On Fri, Jan 31, 2025 at 7:04 PM Stavros...

Maxima differential equations

Hi Leo Thanks for your help. Rgds Allan Payne Sent from my iPad On 16 Jul 2019, at 04:09, Leo Butler l_butler@users.sourceforge.net wrote: The problem is created by the line $quit(); near the bottom of the input file a4.txt. If that line is entered interactively, a syntax error is signaled, but if batched Maxima hangs (it appears to be trying to read a subsequent character). If you remove that line, the code will be batched correctly. Note there is an irrevelant error on the first line, which refers...

Trouble with Batch quit();