Matlab Functions...

alim

Set or query the axes alpha limits

Syntax

• alpha_limits = alim
  alim([amin amax])
  alim_mode = alim('mode')
  alim('alim_mode')
  alim(axes_handle,...)
  

Description

alpha_limits = alim returns the alpha limits (the axes ALim property) of the current axes.

alim([amin amax]) sets the alpha limits to the specified values. amin is the value of the data mapped to the first alpha value in the alphamap, and amax is the value of the data mapped to the last alpha value in the alphamap. Data values in between are linearly interpolated across the alphamap, while data values outside are clamped to either the first or last alphamap value, whichever is closest.

alim_mode = alim('mode') returns the alpha limits mode (the axes ALimMode property) of the current axes.

alim('alim_mode') sets the alpha limits mode on the current axes. alim_mode can be:

• auto - MATLAB automatically sets the alpha limits based on the alpha data of the objects in the axes.
• manual - MATLAB does not change the alpha limits.

alim(axes_handle,...) operates on the specified axes.

all

Test to determine if all elements are nonzero

Syntax

• B = all(A)
  B = all(A,dim)
  

Description

B = all(A) tests whether all the elements along various dimensions of an array are nonzero or logical true (1).

If A is a vector, all(A) returns logical true (1) if all of the elements are nonzero, and returns logical false (0) if one or more elements are zero.

If A is a matrix, all(A) treats the columns of A as vectors, returning a row vector of 1s and 0s.

If A is a multidimensional array, all(A) treats the values along the first non-singleton dimension as vectors, returning a logical condition for each vector.

B = all(A,dim) tests along the dimension of A specified by scalar dim.

Examples

Given,

• A = [0.53 0.67 0.01 0.38 0.07 0.42 0.69]
  

then B = (A <> returns logical true (1) only where A is less than one half:

• 0   0   1   1   1   1   0
  

The all function reduces such a vector of logical conditions to a single condition. In this case, all(B) yields 0.

This makes all particularly useful in if statements,

• if all(A < 0.5)
      do something
  end
  

where code is executed depending on a single condition, not a vector of possibly conflicting conditions.

Applying the all function twice to a matrix, as in all(all(A)), always reduces it to a scalar condition.

• all(all(eye(3)))
  ans =
     0

allchild

Find all children of specified objects

Syntax

• child_handles = allchild(handle_list)
  

Description

child_handles = allchild(handle_list) returns the list of all children (including ones with hidden handles) for each handle. If handle_list is a single element, allchild returns the output in a vector. Otherwise, the output is a cell array.

Examples

Compare the results returned by these two statements.

• get(gca,'Children')
  allchild(gca)

alpha

Set transparency properties for objects in current axes

Syntax

• alpha(face_alpha)
  alpha(alpha_data)
  alpha(alpha_data_mapping)
  alpha(object_handle,...)
  

Description

alpha sets one of three transparency properties, depending on what arguments you specify with the call to this function.

FaceAlpha

alpha(face_alpha) set the FaceAlpha property of all image, patch, and surface objects in the current axes. You can set face_alpha to:

• a scalar - set the FaceAlpha property to the specified value (for images, set the AlphaData property to the specified value)
• 'flat' - set the FaceAlpha property to flat
• 'interp' - set the FaceAlpha property to interp
• 'texture' - set the FaceAlpha property to texture
• 'opaque' - set the FaceAlpha property to 1
• 'clear' - set the FaceAlpha property to 0

See Specifying a Single Transparency Value for more information.

AlphaData (Surface Objects)

alpha(alpha_data) sets the AlphaData property of all surface objects in the current axes. You can set alpha_data to:

• a matrix the same size as CData - sets the AlphaData property to the specified values
• 'x' - set the AlphaData property to be the same as XData
• 'y' - set the AlphaData property to be the same as YData
• 'z' - set the AlphaData property to be the same as ZData
• 'color' - set the AlphaData property to be the same as CData
• 'rand' - set the AlphaData property to a matrix of random values equal in size to CData

AlphaData (Image Objects)

alpha(alpha_data) sets the AlphaData property of all image objects in the current axes. You can set alpha_data to:

• a matrix the same size as CData - sets the AlphaData property to the specified value
• 'x' - ignored
• 'y' - ignored
• 'z' - ignored
• 'color' - set the AlphaData property to be the same as CData
• 'rand' - set the AlphaData property to a matrix of random values equal in size to CData

FaceVertexAlphaData (Patch Objects)

alpha(alpha_data) sets the FaceVertexAlphaData property of all patch objects in the current axes. You can set alpha_data to:

• a matrix the same size as FaceVertexCData - sets the FaceVertexAlphaData property to the specified value
• 'x' - set the FaceVertexAlphaData property to be the same as Vertices(:,1)
• 'y' - set the FaceVertexAlphaData property to be the same as Vertices(:,2)
• 'z' - set the FaceVertexAlphaData property to be the same as Vertices(:,3)
• 'color' - set the FaceVertexAlphaData property to be the same as FaceVertexCData
• 'rand' - set the FaceVertexAlphaData property to random values

See Mapping Data to Transparency for more information.

AlphaDataMapping

alpha(alpha_data_mapping) sets the AlphaDataMapping property of all image, patch, and surface objects in the current axes. You can set alpha_data_mapping to:

• 'scaled' - set the AlphaDataMapping property to scaled
• 'direct' - set the AlphaDataMapping property to direct
• 'none' - set the AlphaDataMapping property to none

alpha(object_handle,value) set the transparency property only on the object identified by object_handle