Matplotlib Contour Plots

[Jamie Mitchell]

On Friday, August 15, 2014 4:13:26 PM UTC+1, Steven D'Aprano wrote:
> Jamie Mitchell wrote:
> 
> 
> 
> > I created the 2D array which read as:
> 
> 
> 
> That's not a 2D array.
> 
> 
> 
> When the amount of data you have is too big to clearly see what it
> 
> happening, replace it with something smaller. Instead of 30 items per
> 
> sub-array, try it with 5 items per sub-array. Instead of eight decimal
> 
> places, try it with single-digit integers. Anything to make it small enough
> 
> to see clearly.
> 
> 
> 
> When I do that with your data, instead of this:
> 
> 
> 
> > array([[[ 2.08800006,  2.29400015,  2.00400019,  1.88000011,  2.0480001 ,
> 
> >           2.16800022,  2.0480001 ,  1.88200009,  1.95800006,  2.00200009,
> 
> >           2.02800012,  1.81200004,  1.95000005,  1.96200013,  1.95200014,
> 
> >           1.99800014,  2.07000017,  1.88200009,  1.98400009,  2.13400006,
> 
> >           2.11400008,  1.89400005,  2.05000019,  2.01999998,  2.03400016,
> 
> >           2.16600013,  2.00999999,  1.86200011,  2.19800019, 
> 
> >           2.01200008]],
> 
> > 
> 
> >        [[ 8.5199995 ,  8.88000011,  8.55000019,  7.94999981,  8.60999966,
> 
> >           8.5199995 ,  8.80000019,  8.13000011,  8.68999958,  8.72999954,
> 
> >           8.47999954,  8.25      ,  8.40999985,  8.43999958,  8.38999939,
> 
> >           8.35999966,  8.63999939,  8.51000023,  8.36999989,  8.69999981,
> 
> >           8.52999973,  8.13999939,  8.36999989,  8.42000008,  8.55999947,
> 
> >           8.72999954,  9.09000015,  8.18999958,  8.76000023, 
> 
> >           8.53999996]]], dtype=float32)
> 
> 
> 
> 
> 
> I get this:
> 
> 
> 
> 
> 
> array([[[ 2,  2,  2,  1,  2]],
> 
>        [[ 8,  8,  8,  7,  8]]], dtype=float32)
> 
> 
> 
> 
> 
> which is much easier to work with. See the difference between that smaller
> 
> example, and my earlier explanation of the difference between a 1D and 2D
> 
> array?
> 
> 
> 
> One dimensional arrays are made from a single list of numbers: [...]
> 
> Two dimensional arrays are made from a list of lists: [ [...], [...] ]
> 
> 
> 
> *Three* dimensional arrays are made from a list of lists of lists: 
> 
> [ [ [...], [...] ] ]
> 
> 
> 
> *Four* dimensional arrays are made from a list of lists of lists of lists:
> 
> [ [ [ [...], [...] ] ] ]
> 
> 
> 
> and so on. You have a 3D array, with dimensions 2 x 1 x 30.
> 
> 
> 
> You can check the dimensions by storing the array into a variable like this:
> 
> 
> 
> py> a = numpy.array([[[ 2,  2,  2,  1,  2]], [[ 8,  8,  8,  7,  8]]])
> 
> py> a.shape
> 
> (2, 1, 5)
> 
> 
> 
> 
> 
> 
> 
> -- 
> 
> Steven

Thanks for your suggestions Steven. Unfortunately I still can't make the plot I'm looking for.

Do you mind if I go back to the start? Sorry I'm probably not explaining what I need very well.

So I have two 1D arrays:

1st array - ([8, 8.8,8.5,7.9,8.6 ...], dtype=float32)

It has a shape (150,)

2nd array - ([2, 2.2, 2.5, 2.3, ...],dtype=float32)

It has a shape (150,)

What I want to do is create a 2D array which merges the 1st and 2nd array so that I would have:

([[8, 8.8,8.5,7.9,8.6 ...],[2,2,2,2,5,2.3, ...]], dtype=float32) that would have a shape (150,150)

In this form I could then plot a 2D contour.

Thanks for your patience.

Jamie