Luca,

It is a bug that appears when recent mpl is used with Numeric as opposed 
to numpy or numarray.  It is fixed in svn.  Your possible solutions are:

1) Use numpy or numarray instead of Numeric
2) Build mpl from svn
3) Edit axes.py as indicated in this diff chunk:

@@ -1217,7 +1217,7 @@
          ACCEPTS: len(2) sequence of floats
          """

-        if xmax is None and hasattr(xmin,'__len__'):
+        if xmax is None and iterable(xmin):
              xmin,xmax = xmin

          old_xmin,old_xmax = self.get_xlim()
@@ -1330,7 +1330,7 @@
          ACCEPTS: len(2) sequence of floats
          """

-        if ymax is None and hasattr(ymin,'__len__'):
+        if ymax is None and iterable(ymin):
              ymin,ymax = ymin

          old_ymin,old_ymax = self.get_ylim()


Eric

[EMAIL PROTECTED] wrote:
> Hello I have installed matplotlib on su 10.0 
> 
> when i do only this example 
> 
> from pylab import *
> plot([1,2,3])
> 
> i get this error:
> only length-1 attays can be converted to Python scalars.
> 
> How i have made wrong?
> 
> Regards
> 
> Luca
> 
> 
> 
> 
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