How do i plot nyquist from experiment data values
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From the code in this page https://www.mathworks.com/help/control/ref/nyquist.html
if true
% load iddata2 z2;
sys_p = tfest(z2,2);
w = linspace(-10*pi,10*pi,512);
[re, im, ~, sdre, sdim] = nyquist(sys_p,w);
re = squeeze(re);
im = squeeze(im);
sdre = squeeze(sdre);
sdim = squeeze(sdim);
plot(re,im,'b', re+3*sdre, im+3*sdim, 'k:', re-3*sdre, im-3*sdim, 'k:')
end
Can i ask where is the part i input my experimental data values or the meaning of codes ? Sorry as i'm kind of new to Matlab with little guidance. Any help is appreciated !
采纳的回答
Star Strider
2017-1-30
If you just want the plot, do a separate nyquist call without any outputs:
figure(1)
nyquist(sys_p,w)
That should produce the plot you want.
6 个评论
Niam
2017-1-30
Star Strider
2017-1-30
It seems as thought you have loaded your experimental data as ‘z2’ into your workspace from a ‘.mat’ file. That is the easiest way.
‘May i ask for the inputting of my experimental data is there a place to store the values so that the matlab can load it to the codes ?’
I do not understand. It seems you already did that successfully.
Niam
2017-1-30
Star Strider
2017-1-30
I didn’t look through the nyquist documentation far enough to see that you’re using an example from it. The data are part of the System Identification Toolbox documentation.
How you read your data into your MATLAB workspace depends on how you now have them stored. There are several ways to import your data into your MATLAB workspace. See the documentation for the importdata, xlsread, textscan and related functions to understand how to do this.
Once you’ve imported your data into your MATLAB workspace, a very easy way to save it to read later is to use the save function to create a ‘.mat’ file with your data. (This creates a new file and doesn’t replace your existing data file.) You can then import it into your MATLAB workspace whenever you want to use it with the load function. See the documentation for those functions to understand how to use them.
Niam
2017-1-31
Star Strider
2017-1-31
My pleasure!
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