Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.lang.python > #2392 > unrolled thread
| Started by | Terry Reedy <tjreedy@udel.edu> |
|---|---|
| First post | 2011-04-01 15:45 -0400 |
| Last post | 2011-04-01 15:45 -0400 |
| Articles | 1 — 1 participant |
Back to article view | Back to comp.lang.python
This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by
below is the oldest one visible, not the original post.
Re: Mathematical Operations on Array Terry Reedy <tjreedy@udel.edu> - 2011-04-01 15:45 -0400
| From | Terry Reedy <tjreedy@udel.edu> |
|---|---|
| Date | 2011-04-01 15:45 -0400 |
| Subject | Re: Mathematical Operations on Array |
| Message-ID | <mailman.96.1301687408.2990.python-list@python.org> |
On 4/1/2011 8:56 AM, Fodness, Bryan C - GS wrote:
> I am loading text into an array and would like to convert the values.
> from math import *
> from numpy import *
> from pylab import *
> data=loadtxt('raw.dat')
> mincos=degrees(acos(data[:,0]))
> minazi=degrees(data[:,1])
> minthick=data[:,2]/0.006858
>
> I am not sure why degrees() works, but acos() does not.
It is not clear how you know that.
> I receive the following
>
> Traceback (most recent call last):
> File "C:\ test.py", line 6, in ?
> mincos=degrees(acos(float(data[:,0])))
>
> TypeError: only length-1 arrays can be converted to Python scalars
This does not say where in the expression the problem arose. to be sure
a = float(data([:,0])
b = acod(a)
c = degrees(b)
> Can anyone tell me what I am doing wrong?
Numpy questions get better answers on the numpy list where numpy experts
hang out.
--
Terry Jan Reedy
Back to top | Article view | comp.lang.python
csiph-web