minfo (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