Am Montag, den 14.03.2011, 21:17 +0100 schrieb Rene Grothmann:
> The reason I want this is the following:
>
> I am the author of Euler (see euler.rene-grothmann.de), which uses Maxima for symbolic computation. A symbolic expression in Euler is entered as
>
> >&diff(x^x,x)
> x
> x (log(x) + 1)
>
> The result is a string, which is stored for Euler, and used in many Euler functions, as you will find out by checking the examples. But the output prints in Maxima's 2D display. How am I achieving this? Currently, I get Maxima to return the string simply by switching of display2d before I send the string to Maxima for evaluation. Next, I send the resulting string back to Maxima just for printing in 2D, turning on display2d beforehand. This works fine most of the time.
>
> However, things like
>
> >&factor(1000)
>
> do not work. The string "2^3*5^3" is OK, but if I send it to printing, it is "simplified" to 1000. I already discovered, and you told me, how to switch that off. Doing it, prints the result correctly.
>
> However, I have the next problem with
>
> >&ev(invert(matrix([3,4],[5,6])),detout)
>
> [ - 3 2 ]
> [ ]
> [ 5 3 ]
> [ - - - ]
> [ 2 2 ]
>
> This returns a matrix statement devided by the determinant in the string. In fact, it returns
>
> >@&ev(invert(matrix([3,4],[5,6])),detout)
>
> -matrix([6,-4],[-5,3])/2
>
>
> If I pass that for printing, the determinant is multiplied inside as shown above.
>
> If I prevent simplification, it never prints in matrix 2D form. So there is no nice way to do this.
>
> This, by the way, is strange to me: What is this matrix form which prints in 2D?
>
> I wish, I could fix a little bit more inside Maxima. I would change a lot of things to fit Euler more closely. However, I am just communication with this mighty system using pipes.
>
> Thanks for your response,
This behavior is a known bug. The output for a matrix is always linear,
when setting the simp flag to false. It is easy to correct this bug, but
I have never done it. I can correct this for the next release.
Dieter Kaiser