Thanks heaps Tom for tidying the program, and more importantly for removing a glitch in my program. ie the M "blipped" owing I think to the wrong number in the sequence 1...24,23...1. I'd spent ages trying to fix it, but after Carl's previous reply, I had decided to live with it! In the name I was working on, the previous letter serendipitously touched the letter M, making it look as if the M had been knocked! ...something I'd not be able to deliberately program myself! ...so, not being able to rid the blip I'd left it in.
Other minor problems:
I could not download the mPlot.mws program. I tried and found the code gobbledy-gook when viewed in a text editor! I copied the screen text to a text editor, and pasted it into a Maple 7 and ran it. The ensuing plot output was perfect, with the M going up and down in multi colors as intended. However, prior to the plot output, it came up with the error message:
Error, wrong number (or type) of parameters in function seq.
The offending piece of code was ...,seq(j, j=23..1,-1)
Maple 7 doesn't cater for the negative feature. Well - it does because the program worked! I merely replaced your code with my original list of [1,2,...,23,24,23..2,1] and it worked without the error message appearing. I'm surprised that the program worked after the error message. All I can think to explain it, is that Maple recognises the code comes from an expert such as youself, and it behaves itself!!:-)
Thanks again for your help: you've made my day.