| Re: 2D Plot in IDL with shading? [message #71513 is a reply to message #71450] |
Mon, 21 June 2010 13:16   |
penteado
Messages: 866
Registered: February 2018
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Senior Member
Administrator |
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On Jun 21, 4:59 pm, Ally <ally.desh...@gmail.com> wrote:
> I'm sorry, now I'm even more confused. I have my 3 data sets, which
> are all arrays with one column and 5273670 rows. I'm trying to plot
> them in this 3D graph as (x,y,z) points. I understand why you're
> saying that I need to reform the response (hadn't thought about the
> connectivity before) but don't understand the fastest-varying
> dimension concept.
You have 5273670 points for response, which are the product of some
number of azimuths (I will call it n_az), by some number of elevations
(I will call it n_el). It was written to the file as a 1D array, which
can be done in one of two usual ways:
1) elevations varying fastest: responses for all elevations are given
for the first azimuth, followed by the responses for all elevations of
the next azimuth, and so on. In this case, you would reform it to
response_2D=reform(response,n_el,n_az)
2) azimuths vary the fastest: responses for all azimuths are given for
the first elevation, followed by the responses for all azimuths of the
next elevation, and so on. In this case, the reform would be
response_2D=reform(response,n_az,n_el)
> I tried reform(response, 2, 5273670) and
> reform(response, 5273670, 2) and got an error that said 'new
> subscripts must not change the number elements in response' each
> time. What dimension am I trying to add to reform exactly?
Reform() only changes the dimensions of something, it preserves the
number of elements. So the products of all dimensions you give to
reform() must be the same as the number of elements of the array you
are reforming. You were trying to make an array with two columns and
5273670 rows (and 5273670 columns and 2 rows), which is not the shape
your response should have, nor is the same number of elements. The
shape should be either (n_az,n_el), or (n_el,n_az), depending on how
it was written to that file.
If you inspect the values of the azimuths and elevations you can find
out which is the order. If the first few (n_el) elements of azimuth
are the same, then then fastest varying dimension is the elevation,
and response should be reformed to (n_el,n_az).
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