Re: [Matplotlib-users] Newbie question.

[Perry G. <pe...@st...>]

On Feb 25, 2005, at 12:40 PM, John Hunter wrote:

>>>>>> "Andrea" == Andrea Riciputi <ari...@pi...> writes:
>
>     Andrea> Hi all, I'm an absolutely matplotlib newbie, so I'm sorry
>     Andrea> if my question is trivial. Anyway I've read the user guide
>     Andrea> and looked at the examples without finding out a solution.
>
>     Andrea> Here it is my problem. Suppose I have a 2-dimensional
>     Andrea> array containg my data, and I want to produce a surface or
>     Andrea> a contour plot with it. Now the imshow() function seems
>     Andrea> the right way to go through. So far so good. Now suppose I
>     Andrea> want to draw the x,y axes for this plot, and suppose my
>     Andrea> axes are represented by **not-uniform** 1-dimensional
>     Andrea> array x[i], y[j]. How can I get the right ticks on the
>     Andrea> plot axes??
>
> You need to interpolate your data onto a rectilinear grid and then use
> pcolor.  imshow requires that your data be an image -- eg the dx and
> dy between rows and columns is the same between every row and column.
> pcolor only assumes a rectilinear grid, so the dx and dy can vary from
> row to row and column to column.  But you have unstructured data.
>
I'm not sure if that is what is being said. What may be referred to is 
a structured 2-d image for which it is intended that the data 
coordinates be taken from the x and y arrays (for corresponding 
locations). The contour task does allow one to give such x and y 
arrays, but not the image display tasks (if I remember correctly). Some 
clarification is needed.

Perry