vzoom (Mu Analysis and Synthesis Toolbox)

Freeze plot axes by clicking mouse twice in plot window

Syntax

vzoom('axis')

Description

vzoom uses the MATLAB functions ginput and axis to freeze the axes by clicking the mouse twice in the plot window that defines minimum and maximum values for x and y. The clicking may be done in any order.

The axis argument specifies the type of graph, and can select between the various logarithmic or linear graph types, just as in vplot. Unlike vplot, the axis argument is not optional. The axis specification choices are:


`'iv,d', 'iv,m','iv,p'`	decimal, magnitude, or phase vs. independent variable
`'liv,d', 'liv,m','liv,p'`	decimal, magnitude, or phase vs.
`'iv,lm'` `'liv,lm'`	log(magnitude) vs. independent variable log(magnitude) vs. log(independent variable)
`'ri', 'nyq'`	real vs. imaginary (parametrized by independent variable)
`'nic'`	Nichols chart
`'ss'`	standard decimal
`'ll'`	log-log
`'ls'`	semilogx
`'sl'`	semilogy

Note that the axis specification is the same as for vplot, with the addition of the last four possibilities. The function is not defined for 'bode'.

Examples

The command vzoom('liv,m') would be equivalent to

[x,y] = ginput(2); 
axis([log10([min(x) max(x)]) min(y) max(y)]);

An example of the use of vzoom is

tf = frsp(nd2sys([ 1 .1],[.1 1]),logspace(-2,2,100)); 
vplot('nic',tf); vzoom('nic'); vplot('nic',tf); axis;