Why does it give error in spectrogram plotting?

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);

Answer 1

[KSSV]

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'));

[Rahul]

Hi KSSV,

Thanks it works.

rgds,

rc