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uncen
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uncen(ptcen)
or uncen(ptcen, ireg)
returns zone centered version of the 2-D zone centered array PTCEN.
The result is (imax-1)-by-(jmax-1) if PTCEN is imax-by-jmax.
If the region number array IREG is specified, zones with region
number 0 are not included in the point centering operation.
Note that IREG should have dimensions imax-by-jmax, like
the input PTCEN array; the first row and column of IREG are ignored.
Without IREG, uncen(ptcen) is equivalent to ptcen(uncp,uncp).
Do not use uncen to zone center data which is naturally point
centered -- use the zncen function for that purpose. The uncen
function is the (nearly) exact inverse of the ptcen function,
so that uncen(ptcen(zncen, ireg), ireg) will return the original
zncen array. The uncen reconstruction is as exact as possible,
given the finite precision of floating point operations.
unknown type function, documented at startup/std.i line 2649
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| SEE ALSO: |
ptcen, |
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undo3
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undo3
or undo3, n
Undo the effects of the last N (default 1) rot3, orient3, mov3, aim3,
setz3, or light3 commands.
unknown type function, documented at include/pl3d.i line 629
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unit
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unit(n)
or unit(n, m)
returns n-by-n (or n-by-m) unit matrix, i.e.- matrix with diagonal
elements all 1.0, off diagonal elements 0.0
unknown type function, documented at startup/matrix.i line 33
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unzoom
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unzoom
restores limits to their values before zoom and pan operations
performed interactively using the mouse.
Use old_limits= limits()
...
limits, old_limits
to save and restore plot limits generally.
unknown type function, documented at startup/graph.i line 781
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| SEE ALSO: |
limits, |
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update_mesh
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update_mesh, mesh, rt, zt
or update_mesh, mesh, rt, zt, ireg
updates the opaque MESH object to reflect a new RT, ZT, and
(optionally) IREG. The boundary edges are recomputed and stored
in MESH, as well.
unknown type function, documented at startup/drat.i line 1094
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| SEE ALSO: |
form_mesh, |
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updateb
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file= updateb(filename)
or file= updateb(filename, primitives)
open a binary date file FILENAME for update (mode "r+b").
The optional PRIMITIVES argument is as for the createb function.
If the file exists, it is opened as if by openb(filename),
otherwise a new PDB file is created as if by createb(filename).
unknown type function, documented at startup/std.i line 2049
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| SEE ALSO: |
openb, get_addrs, at_pdb_open, |
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use_origins
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dummy= use_origins(dont_force)
Yorick array dimensions have an origin as well as a length.
By default, this origin is 1 (like FORTRAN arrays, unlike C
arrays). However, the array function and the pseudo-index (-)
can be used to produce arrays with other origins.
Initially, the origin of an array index is ignored by Yorick; the
first element of any array has index 1. You can change this
default behavior by calling use_origins with non-zero DONT_FORCE,
and restore the default behavior by calling use_origins(0).
When the returned object DUMMY is destroyed, either by return from
the function in which it is a local variable, or by explicit
redefintion of the last reference to it, the treatment of array
index origins reverts to the behavior prior to the call to
use_origins. Thus, you can call use_origins at the top of a
function and not worry about restoring the external behavior
before every possible return (including errors).
unknown type function, documented at startup/std.i line 380
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| SEE ALSO: |
array, |
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