asel

Mapdl.asel(type_='', item='', comp='', vmin='', vmax='', vinc='', kswp='', **kwargs)

Selects a subset of areas.

APDL Command: ASEL

Note

Starting with PyMAPDL v0.66.0, you can use “P” as a second argument to select entities interactively. A window pops up allowing you to select, unselect, add or reselect entities depending on the first argument type_. An array with the ids of new selection is returned when the window is closed.

You can switch between selecting and unselecting pressing the keyboard key U.

Parameters:

type_

Label identifying the type of select:

S

Select a new set (default)

R

Reselect a set from the current set.

A

Additionally select a set and extend the current set.

U

Unselect a set from the current set.

ALL

Restore the full set.

NONE

Unselect the full set.

INVE

Invert the current set (selected becomes unselected and vice versa).

STAT

Display the current select status.

The following fields are used only with Type = S, R, A, or U:

Item

Label identifying data. Valid item labels are shown in Table 105: ASEL - Valid Item and Component Labels (p. 185). Some items also require a component label. If Item = PICK (or simply “P”), graphical picking is enabled and all remaining command fields are ignored (valid only in the GUI). Defaults to AREA.

Comp

Component of the item (if required). Valid component labels are shown in Table 105: ASEL - Valid Item and Component Labels (p. 185).

VMIN

Minimum value of item range. Ranges are area numbers, coordinate values, attribute numbers, etc., as appropriate for the item. A component name (as specified on the CM (p. 338) command) may also be substituted for VMIN (VMAX and VINC are ignored). If Item = MAT, TYPE, REAL, or ESYS and if VMIN is positive, the absolute value of Item is compared against the range for selection; if VMIN is negative, the signed value of Item is compared. See the ALIST (p. 106) command for a discussion of signed attributes.

VMAX

Maximum value of item range. VMAX defaults to VMIN.

VINC

Value increment within range. Used only with integer ranges (such as for area numbers). Defaults to 1. VINC cannot be negative.

KSWP

Specifies whether only areas are to be selected:

• kswp = 0 Select areas only.

• kswp = 1 Select areas, as well as keypoints, lines, nodes, and elements associated with selected areas.

Valid only with Type = S.

Returns:

np.ndarray

Numpy array with the ids of the selected entities. For more information visit Postprocessing.

Notes

Selects a subset of areas. For example, to select those areas with area numbers 1 through 7, use

>>> mapdl.asel('S','AREA', '', 1, 7)

The selected subset is then used when the ALL label is entered (or implied) on other commands, such as

>>> mapdl.alist('ALL')

Only data identified by area number are selected. Data are flagged as selected and unselected; no data are actually deleted from the database.

In a cyclic symmetry analysis, area hot spots can be modified. Consequently, the result of an area selection may be different before and after the CYCLIC command.

If Item = ACCA, the command selects only those areas that were created by concatenation. The KSWP field is processed, but the Comp, VMIN, VMAX, and VINC fields are ignored.

This command is valid in any processor.

For Selects based on non-integer numbers (coordinates, results, etc.), items that are within the range VMIN-Toler and VMAX+Toler are selected. The default tolerance Toler is based on the relative values of VMIN and VMAX as follows:

If VMIN = VMAX, Toler = 0.005 x VMIN.

If VMIN = VMAX = 0.0, Toler = 1.0E-6.

If VMAX ≠ VMIN, Toler = 1.0E-8 x (VMAX-VMIN).

Use the SELTOL command to override this default and specify Toler explicitly.

Table: 127:: : ASEL - Valid Item and Component Labels

Examples

Select area(s) at location x == 0. Note that value of seltol is used since vmin == vmax.

>>> mapdl.asel('S', 'LOC', 'X', 0)

Select areas between y == 2 and y == 4

>>> mapdl.asel('S', 'LOC', 'Y', 2, 4)