@rab285 Is your Matrix 383 rows by 3 columns?

Please post your code, showing an example of the phenomenon that you describe.

@Deltafee You need a semicolon after Array(1..2).

@adel-00 It should be 4*Pi and 5*Pi, not 4Pi and 5Pi.

Do you want to plot two curves on the same axes? or on different axes side-by-side? Using an Array will make them side-by-side.

You may just be missing multiplication signs in your plot commands.

@adel-00 The 2 stands for the 2nd column of the data matrix, which is the y-coordinates. You do not have to change anything inside the procedure.

I can't tell you why it doesn't work for your P4 and P5 because you haven't said how you generated them.

Two more bug with MaplePrimes:

1. When one edits a post with an uploaded plot (probably other uploads also), the plot disappears.
2. The plot of a user's reputation over time doesn't work: The area where the plot use to be is just blank.

@adel-00 To do that, you need to remove the definition of tau from the initialization section. Only give tau a value before each individual plot.

tau:= Pi:
P1:= plot(Spec, -15..15, options )
 
Normalize:= proc(P::specfunc(anything, PLOT))
local A,Smax1;
     A:= op([1,1], P);
     Smax1:= max(A[..,2]);
     if A::list then  A:= Matrix(A)  end if;
     A[..,2]:= A[..,2]/Smax1;
     subsop([1,1]= A, P)
end proc:

P1:= Normalize(P1):
tau:= 2*Pi:
P2:= plot(Spec, -15..15):
P2:= plottools:-translate(Normalize(P2), 0, 1):
tau:= Pi/3:
P3:= plot(Spec, -15..15);
P3:= plottools:-translate(Normalize(P3), 0, 2):
display([P1,P2,P3]);

@Kitonum The English plural of a noun that ends in -sis is to change -sis to -ses, and this is pronounced with a long e: -seez. So, the plural of basis is bases, pronounced BAY-SEEZ. Sorry to have a language with such arbitrary-seeming rules.

@ecterrab Now that I know that it is expected to be idempotent, I will post them when I encounter them. I haven't saved my examples because I didn't think that it would be considered a bug. The idempotency should be mentioned on the help page.

@yendis Okay, you specify a line and a plane in any form that you want, and I'll show you how to use geom3d on them.

That was asked and answered two weeks ago: here's the link

@nm Your questions are very good, but I do not have the answers. I do use some trial-and-error. I have a good feeling for what expand, combine, and evalc do. But when I use one-argument simplify or convert(..., form) (where form is a function name or function class name), then I am using trial-and-error. One thing that makes one-argument simplify hard to understand is that it is not idempotent, i.e., simplify(simplify(expr)) is not necessarily the same as simplify(expr).

The reason that I did not answer in the other thread is that I think that what you ultimately want is a procedure that determines whether a line segment intersects a triangle. This idea about the end point of the line segment satisfying 2 or 3 of the inequalities is not enough for that.

@adel-00 From your previous posts, I am guessing that you simply want the original plot shifted up by 1. So, suppose that P is the original plot. Then use

P2:= plottools:-translate(P, 0, 1);
plots:-display([P,P2]);