plotting graph in simulink

I have to plot graphs in simulink the graphs is i the link

http://imgur.com/nVY8q

how can we plot the graph in simulink,if not possible in simulink ,please tell how to plot in matlab m file

Answer 1

[Azzi Abdelmalek]

This is a plot of a step response of second order system, you can use step command in a for loop, varying the damping coefficient sigma from 0 to 1

hold on;
sigma=.5;
for k=1:5
w0=1;
sigma=sigma+.1;
N=[w0];
D=[1 2*sigma*w0 w0^2]
step(N,D)
end
grid

[Azzi Abdelmalek]

you can get the same figure in simulink, by simulating 5 ore more second order transfer function with differents damping coefficient sigma, and use one scope and one multiplexer

[Pat]

Thanks Azzi But those grapg are in negative region,please tell how t0 plot

[Azzi Abdelmalek]

What do you mean by they are in negative region, and show correctly the image you want to make.

[Pat]

my graph is

http://www.sendspace.com/file/44fh7a

in this non-stable region B is in negative axis..

non-stable region A is in positive axis..

is it possible to get graph like this..else plz tell hoe to plot non-stable region B in negative axis

[Azzi Abdelmalek]

It appears that is a frequency response, what your graph is supposed to represent?

[Pat]

ya azzi its a frequency response,it represents non stability regions during power flow

[Azzi Abdelmalek]

You can't just draw this plot, you must provide the frequency response

[Pat]

is it possible to draw non stability region B in negative region

Answer 2

[Kaustubha Govind]

MATLAB might be more appropriate if you want to control the line styles. See Specifying Line Style.

[Pat]

I need to plot like given in image ,the code to plot such graphs,can u help me please

[K E]

Here is documentation on getting started with plotting in Matlab. Here is another link on plotting.

[Pat]

I know to plot different graphs with line specified ,but how to get the same shape as i have posted

[Walter Roberson]

You put it together yourself, calculating where all the lines should go.

There is no built-in plot of that style that I know of in MATLAB (but it is possible it exists in a toolbox somewhere or in Simulink somewhere and I just have not run across it yet.)

[Kaustubha Govind]

Pat: Are you asking us to identify the function that has been plotted? That might be difficult to do.