http://www.mapleprimes.com/posts/42822-Signx en-us 2026 Maplesoft, A Division of Waterloo Maple Inc. Maplesoft Document System Fri, 12 Jun 2026 02:31:59 GMT Fri, 12 Jun 2026 02:31:59 GMT The latest comments added to the Post, sign(x) http://www.mapleprimes.com/images/mapleprimeswhite.jpg http://www.mapleprimes.com/posts/42822-Signx http://www.mapleprimes.com/posts/42822-Signx?ref=Feed:MaplePrimes:sign(x):Comments#comment79836 Below is an explanation given from ?sign at the Maple prompt. Maybe it can shed some light. plot(sign(x), x=-1..1); Notice that the plot results in the line y=1. This occurs because it computes the constant sign(x)=1 and plots that. To get the expected plot, enclose sign(x) in right-single quotes. Regards, Georgios Kokovidis The latest comments added to the Post, sign(x) 79836 Tue, 06 Jun 2006 05:42:00 Z gkokovidis gkokovidis http://www.mapleprimes.com/posts/42822-Signx?ref=Feed:MaplePrimes:sign(x):Comments#comment79835 The original example is covered by its own explanatory paragraph in the help-page ?sign . There is also sometimes confusion between the functions sign() and signum(). Consider this below, where no quoting is necessary, plot([signum(x)],x=-1..1); and see ?signum . acer The latest comments added to the Post, sign(x) 79835 Tue, 06 Jun 2006 07:47:46 Z acer acer