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Why does it give error in spectrogram plotting?

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Rahul
Rahul 2024-4-3
评论： Rahul 2024-4-3
Hello,
I'm getting an error while generating spectrogram.
  1. It shows "Dot indexing is not supported for variables of this type."
  2. Why does readmatrix doesn't work?
My data is also attached herewith.
Can someone guide me please.
My code as below:
close all;
freq_sam = 100000; % samples in data
period_sam = 0.005; % time period
freq_sys = 1/period_sam; % frequency
data = @(filename)fullfile('D:\Rahul\Data_tokamak\data&plot\data_paper1\H-mode data\H-mode bistable model\set1_neoAno_ratio_10\beta0.01\data1_H0_27b.mat',filename);
%data = readmatrix('D:\Rahul\Data_tokamak\data&plot\data_paper1\H-mode data\H-mode bistable model\set1_neoAno_ratio_10\beta0.01\data1_H0_27b.mat');
x_data = data.variable.t(1,:);
y_data = data.variable.Gamma(1,:);
disp(x_data);
disp(y_data);
Ts = mean(diff(x_data));
Fs = 1/Ts;
disp(Fs);
figure
pspectrum(y_data, Fs, 'spectrogram') % Plot 'pspectrum' 'spectrogram'
[sp,fp,tp] = pspectrum(y_data,Fs,"spectrogram", 'TimeResolution',0.5,'OverlapPercent',0,'Leakage',0.85); % Return Values, Then Plot
%waterfall(fp,tp,sp')
%set(gca,XDir="reverse",View=[60 60])
xlabel("Time (s)")
ylabel("Frequency (Hz)")
%signal_tt1 = data1;
%fft_tt1 = fft(signal_tt1); % fourier transform
%fft_tt1 = fftshift(fft_tt1); % performing fft shift
%f = freq_sam/2*linspace(-1,1,freq_sam);
%figure;
%plot(f, fft_tt1);

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采纳的回答

KSSV
KSSV 2024-4-3
Replace
data = @(filename)fullfile('D:\Rahul\Data_tokamak\data&plot\data_paper1\H-mode data\H-mode bistable model\set1_neoAno_ratio_10\beta0.01\data1_H0_27b.mat',filename);
with
load(fullfile('D:\Rahul\Data_tokamak\data&plot\data_paper1\H-mode data\H-mode bistable model\set1_neoAno_ratio_10\beta0.01\data1_H0_27b.mat'));

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