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comp.lang.python

Where can I find documentation for data[:,9]

Cal Who

3/11/2010 7:02:00 PM

data = readdata( 'data/input.dat', delimiter = ',' )

input = data[:, :9]#nine data columns



Where can I find documentation for the

data[:,9]

in the code above.

Been looking and found many examples but would like to know the definition.

I need to skip the first column and then read 9



I would also like to print the data in ihe variable "input"



Thanks
4 Answers

Robert Kern

3/11/2010 7:22:00 PM

0

On 2010-03-11 13:01 PM, Cal Who wrote:
> data = readdata( 'data/input.dat', delimiter = ',' )
>
> input = data[:, :9]#nine data columns
>
>
>
> Where can I find documentation for the
>
> data[:,9]
>
> in the code above.
>
> Been looking and found many examples but would like to know the definition.

When asking questions like this, it helps *a lot* to provide a complete example,
not just a snippet. If I weren't already intimately familiar with the library
you are using, I would have no idea how to help you.

However, I do know that input object is a numpy array, and the syntax you are
asking about is multidimensional slicing.

http://docs.scipy.org/doc/numpy/reference/arrays.ind...

> I need to skip the first column and then read 9

data[:, 1:10]

> I would also like to print the data in ihe variable "input"

print input

--
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco

Cal Who

3/11/2010 10:09:00 PM

0


"Robert Kern" <robert.kern@gmail.com> wrote in message
news:mailman.631.1268335358.23598.python-list@python.org...
> On 2010-03-11 13:01 PM, Cal Who wrote:
>> data = readdata( 'data/input.dat', delimiter = ',' )
>>
>> input = data[:, :9]#nine data columns
>>
>>
>>
>> Where can I find documentation for the
>>
>> data[:,9]
>>
>> in the code above.
>>
>> Been looking and found many examples but would like to know the
>> definition.
>
> When asking questions like this, it helps *a lot* to provide a complete
> example, not just a snippet. If I weren't already intimately familiar with
> the library you are using, I would have no idea how to help you.
>
> However, I do know that input object is a numpy array, and the syntax you
> are asking about is multidimensional slicing.
>
> http://docs.scipy.org/doc/numpy/reference/arrays.ind...
>
>> I need to skip the first column and then read 9
>
> data[:, 1:10]
>
>> I would also like to print the data in ihe variable "input"
>
> print input
>
> --
> Robert Kern
>
> "I have come to believe that the whole world is an enigma, a harmless
> enigma
> that is made terrible by our own mad attempt to interpret it as though it
> had
> an underlying truth."
> -- Umberto Eco
>
Thanks, that helped a lot.

I'm having trouble knowing what to search for to find documenatation. For
example, is print a Python command, a numpy command or a java command?

I like to read the documentation even if the command is working for me.


Thanks again


Martin P. Hellwig

3/11/2010 10:19:00 PM

0

On 03/11/10 22:08, Cal Who wrote:
<cut>
> Thanks, that helped a lot.
>
> I'm having trouble knowing what to search for to find documenatation. For
> example, is print a Python command, a numpy command or a java command?
>
> I like to read the documentation even if the command is working for me.
>
>
> Thanks again
>
>
Probably for you the right way would be to familiarize yourself with the
namespace concept of Python, this makes it easier to identify whether
something is built-in, a standard module or an external module.
Which makes it much easier to feed google the right clues.

--
mph

Cal Who

3/11/2010 10:52:00 PM

0


"Martin P. Hellwig" <martin.hellwig@dcuktec.org> wrote in message
news:hnbq8q$vgm$1@news.eternal-september.org...
> On 03/11/10 22:08, Cal Who wrote:
> <cut>
>> Thanks, that helped a lot.
>>
>> I'm having trouble knowing what to search for to find documenatation. For
>> example, is print a Python command, a numpy command or a java command?
>>
>> I like to read the documentation even if the command is working for me.
>>
>>
>> Thanks again
>>
>>
> Probably for you the right way would be to familiarize yourself with the
> namespace concept of Python, this makes it easier to identify whether
> something is built-in, a standard module or an external module.
> Which makes it much easier to feed google the right clues.
>
> --
> mph

Thanks a lot, I'll look that up now.