[Numpy-discussion] Matlab Translation - sqrt elementwise
Francesc Altet
faltet@carabos....
Tue Apr 17 14:06:05 CDT 2007
El dt 17 de 04 del 2007 a les 20:58 +0200, en/na Miquel Poch va
escriure:
> Hi,
>
> I've found the next expression write it in Matlab,
>
> Rtx = sqrt(Rt);
>
> Rtx is a matrix, and that's why I need sqrt() to operate elementwise.
> I've read NumPy tutorial, and I know it's possible,
>
> A set of this functions, has been provided wich optimize certain kinds
> of calculations on arrays. Most of this functions, such as sin, cos
> and sqrt are unary functions wich operate elementwise. [Numerical
> Python, pg. 13]
>
> but I don't know who to do it. The next error appear when I execute
> the code,
>
> ''' exceptions.TypeError : only length-1 arrays can be converted to
> Python scalars ''
What are you doing? Operating element-wise is one of the most elementary
things that you can do with NumPy:
In [3]:a=numpy.array([[1,2],[3,4]])
In [4]:a
Out[4]:
array([[1, 2],
[3, 4]])
In [5]:numpy.sqrt(a)
Out[5]:
array([[ 1. , 1.41421356],
[ 1.73205081, 2. ]])
Salut,
--
Francesc Altet | Be careful about using the following code --
Carabos Coop. V. | I've only proven that it works,
www.carabos.com | I haven't tested it. -- Donald Knuth
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