# [Numpy-discussion] get information/position of value from matrix

ioannis syntychakis ioannis87@gmail....
Thu Apr 8 03:29:28 CDT 2010

```anybody knows how you can draw with arrays?

i have two arrays, the x and the y coordinates.

i do:
d.ImageDraw.Draw(im)
d.point(E[0],E[1])
im.show()

i get this error:

only length-1 arrays can be converted to python scalars

2010/4/8 ioannis syntychakis <ioannis87@gmail.com>

> Now i can get al the values above the 150, but i would also like to have
> their positions in de matrix.
>
> excample:
>
> [[1. 4. 5. 6. 7. 1
>   2. 5. 7. 8. 9. 3
>   3. 5. 7. 1. 3. 7]]
>
> so, if i now look for values above the 8. the ouput should be; 1 value on
> position (4,1) (beginnning from 0)
>
> is this possible? thanks in advance!!!
> 2010/4/7 Ian Mallett <geometrian@gmail.com>
>
>>   On Wed, Apr 7, 2010 at 7:40 AM, ioannis syntychakis <
>> ioannis87@gmail.com> wrote:
>>
>>> Hallo Everybody,
>>>
>>> I am new in this mail list and python. But I am working at something and
>>>
>>> I have a very big matrix. What I want is to search in that matrix for
>>> values above the (for example:) 150. If there are values above the 150, I
>>> also want to get their position and value.
>>>
>> I think:
>>
>> your_matrix = #
>> indices = np.where(matrix>150.0)
>> values = your_matrix[indices]
>>
>> should work.
>>
>>>   Is this possible?
>>>
>>> ps. could you also tell me how i can show the whole matrix? because now i
>>> see:
>>>
>>> [[ 0. 0. 0. ..., 87. 4. 4.]
>>>  [ 0. 0. 0. ..., 89. 6. 4.]
>>>  [ 0. 1. 0. ..., 87. 4. 3.]
>>>  ...,
>>>  [ 0. 0. 0. ..., 87. 4. 4.]
>>>  [ 0. 3. 0. ..., 87. 4. 4.]
>>>  [ 0. 0. 4. ..., 87. 4. 4.]]
>>>
>>  set_printoptions(precision=None, threshold=None, edgeitems=None, linewidth=None, suppress=None, nanstr=None, infstr=None)
>>
>> Ian
>>
>> _______________________________________________
>> NumPy-Discussion mailing list
>> NumPy-Discussion@scipy.org
>> http://mail.scipy.org/mailman/listinfo/numpy-discussion
>>
>>
>
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