Hi Yojet
I understand that you would like to fix the error during the amplitude calculation using the "sparse" function.
The error message suggests an attempt to create a sparse matrix with character (char) input for the value (s) parameter. The sparse function doesn't accept character inputs for the value parameter. To resolve this issue, possible workaround is to convert the amplitude values to double precision numbers before supplying them to the sparse function.
The following code snippet addresses the issue by converting the amplitude to double:
for j = 1:num_record
spike_data = data(j,:);
sigma = std(data(j,:));
threshold = mean(data(j,:)) + 1.5 * sigma;
spike_index = spike_detection(spike_data, threshold);
amplitude = double(data(j, spike_index)); % Convert amplitude to double
timestamp{j} = sparse(j, spike_index, amplitude);
amplitudes{j} = amplitude;
end
You can refer to the following MathWorks documentation link to know more about "sparse" function:
Hope this helps!
