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Re: [Axiom-math] graphics, long function defs

From: Martin Rubey
Subject: Re: [Axiom-math] graphics, long function defs
Date: Wed, 15 Dec 2004 17:07:08 +0100

Dear Constantine,

* it would help a lot if you'd provide descriptive subject lines.

cf writes:
 >  (1) I tried to plot something but no plot window appeared:
 >  (20) -> draw(cos(t),t=0..%pi);
 >     Compiling function %E with type DoubleFloat -> DoubleFloat 
 >     Graph data being transmitted to the viewport manager...
 >     AXIOM2D data being transmitted to the viewport manager...
 >                                                   Type:
 >  TwoDimensionalViewport
 > It was recommended to run sman but this is not an executable file on my
 > system. 
 > There is a file sman.H1, but this seems to be a C header file. Can
 > something be modified ??

Can't help here since I don't have graphics yet. Tomorrow, maybe. I think
without sman it won't work...

 > (2)  I tried to write the script testkinemat1.input (pasted below) like a
 > function
 >     without input or output variables (see below) but this gave
 >     errors. Not clear what must be done ??

It might be that a function definition in an input file needs line
continuations on every line. Furthermore, a function definition in an input
file (i.e., if it is interpreted, rather than compiled) looks like

fun() == (statement1; statement2; statement3)

statement3 is the result of the function. Hence:

 fun x == x; 1+1

will define a function (in fact, a so-called macro), that always returns x and
then evaluate the expression 1+1, giving 2. In this case, fun(x) will return x!
On the other hand,

 fun x == (x; 1+1)

will define a function that always returns 2.

Applying this to your situation:

testkinemat1() == (_
Acon := matrix([[1, 0, Lo2*cos(phi)+Lo1*sin(phi), -sin(delta1)*a,0,0,0],_
[0, 1, Lo2*sin(phi)-Lo1*cos(phi), a*cos(delta1), 0, 0, 0],_
[0,1, Lo2*sin(phi)+Lo1*cos(phi), 0, a*cos(delta1), 0, 0],_
[1, 0,-Lo2*cos(phi)+Lo1*sin(phi), 0, 0, -sin(delta2)*a, 0],_
[0, 1,-Lo2*sin(phi)-Lo1*cos(phi), 0, 0, a*cos(delta2), 0],_
[1, 0,-Lo2*cos(phi)-Lo1*sin(phi), 0, 0, 0, -sin(delta2)*a],_
[0, 1, -Lo2*sin(phi)+Lo1*cos(phi), 0, 0, 0, a*cos(delta2)]]);_

It also seems, that such a macro definition doesn't like comments inbetween...


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