Re: Matplotlib error: Value Error: x and y must have same first dimension

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From	Laura Creighton <lac@openend.se>
Newsgroups	comp.lang.python
Subject	Re: Matplotlib error: Value Error: x and y must have same first dimension
Date	Fri, 13 Nov 2015 16:43:54 +0100
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Comments	In-reply-to Oscar Benjamin <oscar.j.benjamin@gmail.com> message dated "Fri, 13 Nov 2015 14:04:01 +0000."
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In a message of Fri, 13 Nov 2015 14:04:01 +0000, Oscar Benjamin writes:
>On 13 November 2015 at 08:34, Laura Creighton <lac@openend.se> wrote:
>> In a message of Thu, 12 Nov 2015 17:54:28 -0800, Abhishek writes:
>>>I am trying to run some Python code for the last few hours. How can I achieve the effect of "dot divide" from Matlab, in the following code? I am having trouble working with list comprehension and numpy arrays and getting the following error:
>>>
>>>    Traceback (most recent call last):
>>>      File "Thurs.py", line 128, in <module>
>>>        plt.plot(np.array(range(1,N/2+2)), Splot[alpha][iii,val]/utot[iii,val],color=cmap(iii/50))
>>>
>>>    ValueError: x and y must have same first dimension
>>
>> Splot is a list.  matplotlib wants 2 numpy arrays.  You have to cast
>> it with np.array() too.
>
>Actually the plot command is perfectly happy converting lists or lists
>of lists etc. to arrays (by calling np.array internally) so you don't
>need to convert any of your inputs. By the way: np.arange(1, N/2+2)
>would be the usual way to create a numpy array that is a range.
>
>The error here comes because (after both arguments are converted to
>arrays) they have incompatible sizes. In other words:
>
>    len(range(1,N/2+2)) != len(Splot[alpha][iii,val]/utot[iii,val])
>
>I'm not sure what the solution is as the code is too complex for me to
>spend time trying to guess what it's trying to do.
>
>--
>Oscar

I am sorry for the bad information.  Thank you Oscar.

Laura

Thread

Matplotlib error: Value Error: x and y must have same first dimension Abhishek <abhishek.mallela@gmail.com> - 2015-11-12 17:54 -0800
  Re: Matplotlib error: Value Error: x and y must have same first dimension Laura Creighton <lac@openend.se> - 2015-11-13 09:34 +0100
  Re: Matplotlib error: Value Error: x and y must have same first dimension Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2015-11-13 14:04 +0000
  Re: Matplotlib error: Value Error: x and y must have same first dimension Laura Creighton <lac@openend.se> - 2015-11-13 16:43 +0100
  Re: Matplotlib error: Value Error: x and y must have same first dimension Abhishek Mallela <abhishek.mallela@gmail.com> - 2015-11-13 11:44 -0600

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