| Re: plot (x,y,z) triplets as a surface? [message #17581] |
Tue, 02 November 1999 00:00  |
Pavel Romashkin
Messages: 166
Registered: April 1999
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Senior Member |
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I think it is doooable. Here is what RSI thinks:
SURFACE
The SURFACE procedure draws a wire-mesh representation of a
two-dimensional array projected into two dimensions, with hidden lines
removed.
Restrictions
If the (X, Y) grid is not regular or nearly regular, errors in hidden
line removal occur. The TRIGRID and TRIANGULATE routines can be used to
interpolate irregularly-gridded data points to a regular grid before
plotting.
If the T3D keyword is set, the 3D to 2D transformation matrix contained
in !P.T must project the Z axis to a line parallel to the device Y axis,
or errors will occur.
The surface lines may blend together when drawing large arrays,
especially on low or medium resolution displays. Use the REBIN or CONGRID
procedure to resample the array to a lower resolution before plotting.
Calling Sequence
SURFACE, Z [, X, Y]
Arguments
Z
The two-dimensional array to be displayed. If X and Y are provided, the
surface is plotted as a function of the (X, Y) locations specified by
their contents. Otherwise, the surface is generated as a function of the
array index of each element of Z.
This argument is converted to single-precision floating-point before
plotting. Plots created with SURFACE are limited to the range and
precision of single-precision floating-point values.
X
A vector or two-dimensional array specifying the X coordinates of the
grid. If this argument is a vector, each element of X specifies the X
coordinate for a column of Z (e.g., X[0] specifies the X coordinate for
Z[0,*]). If X is a two-dimensional array, each element of X specifies the
X coordinate of the corresponding point in Z (Xij specifies the X
coordinate for Zij).
This argument is converted to single-precision floating-point before
plotting.
Y
A vector or two-dimensional array specifying the Y coordinates of the
grid. If this argument is a vector, each element of Y specifies the Y
coordinate for a row of Z (e.g., Y[0] specifies the Y coordinate for
Z[*,0]). If Y is a two-dimensional array, each element of Y specifies the
Y coordinate of the corresponding point in Z (Y ijspecifies the Y
coordinate for Zij).
Hope this helps,
Pavel
Don't worry about newbie questions. I feel like a newbie every day when I
work with IDL. IDL has so much in it that I sometimes wonder if there is
anyone who knows all about it. The good thing is that you can accomplish
about everything by using 10% of its capability :-)
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