Re: [Maxima-discuss] Stair function

[Robert D. <rob...@gm...>]

On Sat, Apr 6, 2024 at 11:03 AM Jaime Villate via Maxima-discuss
<max...@li...> wrote:

> Strange,
>
> this works for me in all the Lisp versions I have:

> 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))
> );

I traced E and g and I think what's happening is that 'if x = b then
... ' fails if x is a float and b is an integer, but x is equal to
float(b). Then the loop runs all the way through and eventually yields
'done'. That nonnumeric value causes plot2d to complain.

There have been various changes to plot2d over the last couple of
years, and it seems likely OP is running a version which refuses to
plot if even one value is nonnumeric. The current version just filters
out nonnumeric values, which is, I think, as it should be (and has
been at times in the past).

FWIW

Robert