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Index exceeds the number of array elements (30093)

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Error in line 36
field_data_stim=field_data(stim_start(i):stim_start(i)+499);
Please check the script and files attached
script:
[unit_dataname,unit_listname]=uigetfile('*txt','Choose a file containing unit data.')
unit_data=textread([unit_listname,unit_dataname],'','emptyvalue',NaN);
[data_length,no_units]=size(unit_data);
stim_data=unit_data(:,end);
unit_data=unit_data(:,1:end-1);
no_units=no_units-1;
[field_dataname,field_listname]=uigetfile('*txt','Choose a file containing field data.')
field_data=textread([field_listname,field_dataname],'','emptyvalue',NaN);
stim_start=find(stim_data==1);
no_stims=length(stim_start);
field_phase_stim=nan(500,20,no_stims);
unit_data_stim=nan(500,no_units,no_stims);
no_stim_spikes=zeros(1,no_units);
center_freqs=linspace(10,80,20);
AVP_stim=zeros(nobins,no_units,20);
MI_stim=zeros(no_units,20);
for i=1:no_stims
field_data_stim=field_data(stim_start(i):stim_start(i)+499);
% Filtering field data.
P=filter_fft_filtfilt_no_save(field_data_stim);
field_phase_stim(:,:,i)=P;
U=unit_data(stim_start(i):stim_start(i)+499,:);
unit_data_stim(:,:,i)=U;
[bincenters,M,L]=amp_v_phase_stenhn(nobins,U,P);
AVP_stim=AVP_stim+M;
no_stim_spikes=no_stim_spikes+sum(unit_data_stim(:,:,i));
end
MI_stim=inv_entropy_save(AVP_stim);
AVP_shuf=zeros(nobins,no_units,20,100);
MI_shuf=zeros(no_units,20,100);
no_shuf_spikes=zeros(100,no_units);
for i=1:100
EEG_shuffle_indices=ceil(rand(1,no_stims)*no_stims);
unit_shuffle_indices=ceil(rand(1,no_stims)*no_stims);
for j=1:no_stims
P_shuf=field_phase_stim(:,:,EEG_shuffle_indices(j));
U_shuf=unit_data_stim(:,:,unit_shuffle_indices(j));
[bincenters,M,L]=amp_v_phase_stenhn(nobins,U_shuf,P_shuf);
AVP_shuf(:,:,:,i)=AVP_shuf(:,:,:,i)+M;
no_shuf_spikes(i,:)=no_shuf_spikes(i,:)+sum(U_shuf);
end
MI_shuf(:,:,i)=inv_entropy_save(AVP_shuf(:,:,:,i));
for k=1:no_units
AVP_shuf(:,k,:,i)=AVP_shuf(:,k,:,i)/no_shuf_spikes(i,k);
end
end
for j=1:no_units
for k=1:20
for i=1:nobins
below_AVP_indices=AVP_shuf(i,j,k,:)<=AVP_stim(i,j,k);
AVP_p_vals(i,j,k)=sum(below_AVP_indices,4)/100;
end
below_MI_indices=MI_shuf(j,k,:)<=MI_stim(j,k);
MI_p_vals(j,k)=sum(below_MI_indices,3)/100;
end
end
for j=1:no_units
figure()
AVP_stim(:,j,:)=AVP_stim(:,j,:)/no_stim_spikes(j);
Prop_shuf(:,j,:)=nanmean(AVP_shuf(:,j,:,:),4);
max_prop=max(max(max(AVP_stim(:,j,:))),max(max(Prop_shuf(:,j,:))));
subplot(3,1,1)
colorplot(AVP_stim(:,j,:))
axis xy
caxis([0 max_prop])
colorbar
set(gca,'XTick',[1:nobins]+.5,'YTick',[1:no_freqs]+.5,'XTickLabel',bincenters,'YTickLabel',center_freqs)
title('Percent Spikes by Phase of LFP Oscillations (Auditory Stimulus)')
xlabel('Oscillation Phase (Radians)')
ylabel('Oscillation Frequency (Hz)')
subplot(3,1,2)
colorplot(Prop_shuf(:,j,:))
axis xy
caxis([0 max_prop])
colorbar
set(gca,'XTick',[1:nobins]+.5,'YTick',[1:no_freqs]+.5,'XTickLabel',bincenters,'YTickLabel',center_freqs)
title('Percent Spikes by Phase of LFP Oscillations (Mean, 100 Random Shuffles)')
xlabel('Oscillation Phase (Radians)')
ylabel('Oscillation Frequency (Hz)')
subplot(3,1,3)
colorplot(AVP_p_vals(:,j,:))
caxis([0 1])
colorbar
axis xy
set(gca,'XTick',[1:nobins]+.5,'YTick',[1:no_freqs]+.5,'XTickLabel',bincenters,'YTickLabel',center_freqs)
title('Empirical p-Value of Spikes by Phase (Auditory Stimulus >= Percent of Random Shuffles)')
xlabel('Oscillation Phase (Radians)')
ylabel('Oscillation Frequency (Hz)')
saveas(gcf,['Unit_',num2str(j),'_svp'],'pdf')
for k=1:20
figure()
plot(bincenters,reshape(AVP_shuf(:,j,k,:),nobins,100),'y')
hold on
plot(bincenters,AVP_stim(:,j,k),'k')
title({['Proportion of Unit ',num2str(j),' Spikes by Phase of ',num2str(center_freqs(k)),' Hz Oscillation'];'Actual LFP (Black) vs. 100 Shuffled LFP Segments (Yellow)'})
saveas(gcf,['Unit_',num2str(j),'_by_',num2str(round(center_freqs(k))),'_Hz_svp'],'pdf')
close(gcf)
end
end
figure()
MI_shuf_mean=mean(MI_shuf,3);
max_MI=max(max(max(MI_stim)),max(max(MI_shuf_mean)));
subplot(1,3,1)
colorplot(MI_stim')
axis xy
caxis([0 max_MI])
colorbar
set(gca,'XTick',[1:no_units]+.5,'YTick',[1:no_freqs]+.5,'XTickLabel',[1:no_units],'YTickLabel',center_freqs)
title({'Modulation of Spikes by LFP Oscillations';'(Auditory Stimulus)'})
xlabel('Unit')
ylabel('Oscillation Frequency (Hz)')
subplot(1,3,2)
colorplot(MI_shuf_mean')
axis xy
caxis([0 max_MI])
colorbar
set(gca,'XTick',[1:no_units]+.5,'YTick',[1:no_freqs]+.5,'XTickLabel',[1:no_units],'YTickLabel',center_freqs)
title({'Modulation Spikes by Phase of LFP Oscillations';'(Mean, 100 Random Shuffles)'})
xlabel('Unit')
ylabel('Oscillation Frequency (Hz)')
subplot(1,3,3)
colorplot(MI_p_vals')
caxis([0 1])
colorbar
axis xy
set(gca,'XTick',[1:no_units]+.5,'YTick',[1:no_freqs]+.5,'XTickLabel',[1:no_units],'YTickLabel',center_freqs)
title({'Empirical p-Value of Modulation of Spikes by Phase';'(Percent of Random Shuffles <= Auditory Stimulus)'})
xlabel('Unit')
ylabel('Oscillation Frequency (Hz)')
saveas(gcf,['Unit_',num2str(j),'_MI'],'pdf')

Accepted Answer

Prudhvi Peddagoni
Prudhvi Peddagoni on 18 Jan 2021
Hi,
In the 19th line that contains the below line in your code,
field_data_stim = field_data(stim_start(i):stim_start(i)+499);
the field_data variable length is 30093. Where as some of the elements in stim_start variable are greater than (30093 - 499). So when you are trying to access field_data(stim_start(i)+499), the index is greater than 30093. So you can add an if statement to check if stim_start(i) +499 is greater than length(field_data) and change the code like this:
if stim_start(i)+499 > length(field_data)
field_data_stim = field_data(stim_start(i):length(field_data));
else
field_data_stim= field_data(stim_start(i):stim_start(i)+499);
end
Hope this helps.
  2 Comments
Steve
Steve on 18 Jan 2021
Thank you, really appreciate it.
But have this issue at line 28 or 29 below "P=filter_fft_filtfilt_no_save(field_data_stim);"
Error;
"Unable to perform assignment because the size of the left side is 500-by-20 and the size of the right side is 477-by-20."
Error in Stenhn_analysis_try_V1b (line 29)
field_phase_stim(:,:,i)=P;
Steve
Steve on 30 Jan 2021
Error;
"Unable to perform assignment because the size of the left side is 500-by-20 and the size of the right side is 477-by-20."
Error in Stenhn_analysis_try_V1b (line 29)
field_phase_stim(:,:,i)=P;

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