Bar plot command to get results same as in PowerGUI FFT analysis bar (relative to fundamental)

Question

Michal Przybylski 2022-8-27

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1788515-bar-plot-command-to-get-results-same-as-in-powergui-fft-analysis-bar-relative-to-fundamental

回答： Alvaro Zarate 2023-9-1

I want generate from command(.m file) same bar plot as in I see in PowerGUI FFT

can any one provide script?

from figure I can get only

function createfigure(xvector1, yvector1)

%CREATEFIGURE(xvector1, yvector1)

% XVECTOR1: bar xvector

% YVECTOR1: bar yvector

% Auto-generated by MATLAB on 27-Aug-2022 22:17:18

% Create figure

figure1 = figure('Name','FFT Analysis Results');

% Create axes

axes1 = axes('Parent',figure1,...

'Position',[0.117216117216117 0.11530064072437 0.815018315018315 0.805896805896806]);

hold(axes1,'on');

% Create bar

bar(xvector1,yvector1,'BarWidth',0.5);

% Create ylabel

ylabel('Mag (% of Fundamental)');

% Create xlabel

xlabel('Harmonic order');

% Create title

title('Fundamental (50Hz) = 1.608 , THD= 20.67%');

% Uncomment the following line to preserve the X-limits of the axes

% xlim(axes1,[-2.5 50]);

% Uncomment the following line to preserve the Y-limits of the axes

% ylim(axes1,[0 11.443947243101]);

box(axes1,'on');

grid(axes1,'on');

% Set the remaining axes properties

set(axes1,'XMinorGrid','on','YMinorGrid','on','ZMinorGrid','on');

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Answer 1

William Rose 2022-8-27

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1788515-bar-plot-command-to-get-results-same-as-in-powergui-fft-analysis-bar-relative-to-fundamental#answer_1035630

@Michal Przybylski,

What is this for? I ask because I have been guilty of providing too much assistance on this site to people who are seeking help doing their homework. I am not familiar with powerGUI FFT.

Have you looked at thd? Does it not do what you need? Read the help page for it carefully, to understand it. Notice the optional form

[r,harmpow,harmfreq] = thd(___)

which will interst to you.

The function you included in your posting requires two vector inputs. They must be of equal length. xvector should be the vector of harmonic number, from 0 to the maximum value of interest, and yvector should be the power at each harmonic, expressed as a % of the power in the fundamental. The function generates a title which assumes that fundamental freq=50Hz, THD=20.67%, etc. Those values will probably not be true for you, so you should adapt the funciton to use the correct values for your data.

Good luck!