[Maxima] Problem wirt erf

[Barton Willis]

It works for me with 5.21.1 + gcl + Windows; maybe you need 5.20.1 instead of 5.20.0?

Suggestion: Try defining your functions using something like:

 (%i15) integrate(exp(-w^2/2),w)$
 (%i16) distri0(w):= ''%$
 (%i17) distri(q):=(1/sqrt(2*%pi)*(sqrt(%pi/2)-distri0(q)))$

In your code, if you later assign A a new value, the function distri0 will misbehave.

--Barton

-----maxima-bounces at math.utexas.edu wrote: -----

>A:integrate(exp(-w^2/2),w);
>distri0(q):=float(subst(q,w,A));
>distri(q):=float(1/sqrt(2*%pi)*(sqrt(%pi/2)-distri0(q)));

>But then on Maxima 5.21.0 (the official binary gcl for windows) the 
>calculation
>distri(0);
>yields the error message