Mu Analysis and Synthesis Toolbox

Provide matrix information

Syntax

• minfo(matin) 
  [systype,rowdata,coldata,pointdata] = minfo(matin)
  

Description
minfo returns information about the data type, and size of the matin. With no output assignment, minfo returns text output to the screen. The information is determined from the data structure as defined in the "The Data Structures" section in Chapter 2.

With output arguments, minfo returns four arguments. The first argument, systype, is a string variable that can take one of four values. The interpretation of the three additional output arguments is based on the variable systype.

systype == 'vary'	matin is a VARYING matrix. pointdata tells how many independent variable values there are, rowdata is the row dimension of a matrix, and coldata is the column dimension
systype == 'syst'	matin is a SYSTEM matrix. pointdata is the number of states, rowdata is the number of outputs, and coldata is the number of inputs.
systype == 'cons'	matin is a regular MATLAB matrix, pointdata is set to NaN, rowdata is the number of rows, and coldata is the number of columns.
systype == 'empt'	matin is an empty MATLAB matrix; also pointdata, rowdata, and coldata are set to empty.

Examples
minfo identifies the type of matrix being manipulated. Compare the displays for a CONSTANT, SYSTEM, and VARYING matrix.

• a = rand(2,2);b = rand(2,3);c = rand(1,2); 
  minfo(a)
  constant:                2 rows   2 cols
  sys = pck(a,b,c); 
  minfo(sys)
  system:                  2 states 1 outputs3 inputs
  sys_g = frsp(sys,[.1 .5 .9 1.4]); 
  minfo(sysg)
  varying:                 4 pts    1 rows 3 cols
  4 pts between 0.1 and 0.4
  sys = sysrand(2,3,1); 
  [mtype,mrows,mcols,mnum] = minfo(sys); 
  mtype
  mtype =
  syst
  [mrows,mcols,mnum]
  ans =
      1            3           2
  

See Also
pck, pss2sys, sys2pss, unpck, vpck, vunpck

mfilter

minv, vinv