Re: [Maxima-discuss] Stair function

[Jaime V. <vi...@fe...>]

Try this:

g(x):=E(f,x,10,0,1)$

plot2d([f,g], [x,0,1]);

Plot2d expects an expression of one variable or the name of a function 
with only input parameter. Notice that neither E(f,x,10,0,1)]  nor g(x) 
return an expression with the variable x and E is not the name of a 
function with a single input parameter but g is.

Regards,

Jaime

On 06/04/24 16:32, Pierre CAMPET wrote:
>
> Hello
>
>
> I'd like to draw a stair function to illustrate what we called in 
> france "Méthode des rectangles" :
>
> I try this :
>
> f(x):=1/(1+x);
> E(f,x,n,a,b):=block(
>     if x=b then return(f(b))
>     else
>     for i:1 thru n do if (x < a+i*(b-a)/n) then return(f(a+(i-1)/n))
> );
> E(f,0.19,10,0,1);
> E(f,1,10,0,1);
> E(f,0,10,0,1);
>
> But
>
> wxplot2d([f(x),E(f,x,10,0,1)], [x,0,1])$
>
> give me an error : COERCE-FLOAT-FUN: no such Lisp or Maxima function: done
>
> any idea to produce the function may be with no evaluation on each x ?
>
>