problem in reading my data in matlab from intan

[Kashish Parnami]

When I record my data in intan software my data looks perfectly fine clean data but when I try to plot that in MATLAB it looks something different I have also shared my code for raw extraction and my intan data recording. Please help me.

fileinfo = dir('amplifier.dat');

num_samples = fileinfo.bytes/2;

fid = fopen('amplifier.dat', 'r');

v = fread(fid, num_samples, 'int16');

fclose(fid);

%v = v * 0.0000374; %convert to volts

v = v * 0.195; % convert to microvolts

%%%Time Data input

fileinfo = dir('time.dat');

num_samples = fileinfo.bytes/4; % int32 = 4 bytes

fid = fopen('time.dat', 'r');

t = fread(fid, num_samples, 'int32');

fclose(fid);

% t = t / frequency_parameters.amplifier_sample_rate; % sample rate from header file

t=t/20000;

%%%Sampling rate

fs=20000;

%%%Filtering

w=50/(fs/2);

bw=w;

[num,den]=iirnotch(w,bw);...implementation of notch filter

v_notch=filter(num,den,v);

fc=300;

[b,a]=butter(3,fc/(fs/2));...implementation of 3rd oder Butterworth filter

v_filtered=filter(b,a,v_notch);

v1=v-v_filtered;

%%%Plotting

figure, plot(t,v1,'k')

I am also getting one auxillary file as well is it something related to that.

[Josh Siegle]

Hi Kashish,

Based on this code, it looks like you could be missing a `reshape` step – the matrix `v` needs to be reshaped to num_samples / num_channels x num_channels.

If that doesn't fix the problem, I'd recommend reaching out to Intan's support team.

Josh

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