how my code get the bit modification?

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Muhammad
Muhammad on 7 Oct 2021
Commented: Geoff Hayes on 8 Oct 2021
this stops on 90,180,270,360 now i want certain changes to stops at 45,115,225,315 what changes are required?
%load excel data
trials_1 = xlsread('Block1_3');
%general
subject = 'final'; % enter subject code
IBF = 20; % individual beta frequency
protlength = 750; % in seconds length of final output
ramptime = 10; % in seconds length of ramp time
fsample = 10000; % sampling rate of data
saveloc = '/Users/tinahocher/Desktop/MATLAB_EEGLAB_DATA /Phase_stop/';
% time vector
t = [1/fsample:1/fsample:protlength];
%---------------------------
% create sine wave
beta{1} = sin(IBF*2*pi*[1/fsample:1/fsample:protlength]);
%create mat file
stimuli = zeros(5,protlength.*fsample);
%add beta wave
for it = 1:length(beta)
stimuli(3,:) = beta{it};
% ramp up
in = 1:ramptime*fsample;
stimuli(3,in) = beta{it}(in).*linspace(0,1, length(in));
end
save([saveloc 'try_stim_' subject], 'stimuli');
%add trigger at start of each trial
x = trials_1;
for i = 1:length(x)
start_trial(i) = x(i,4);
start_trial(i) = ((start_trial(i))*fsample) +(ramptime*fsample);
end
for j = 1:length(start_trial)
stimuli(5,round(start_trial(j)-5):round(start_trial(j)+5)) = 16;
end
%add trigger at eacht stop
for i = 1:length(x)
stop_time(i) = x(i,2);
stop_time(i) = ((stop_time(i))*fsample);
if ~isnan(stop_time(i))
stop_trigger(i) = stop_time(i) + start_trial(i);
else stop_trigger(i) = NaN;
end
end
stop_trigger_final = stop_trigger(~isnan(stop_trigger));
% %---------------------------------
% %turn off just for testing purpose
% for j = 1:length(stop_trigger_final)
% stimuli(5,round(stop_trigger_final(j))) = 8;
% end
% %---------------------------------
stop_phase = x(~isnan(stop_trigger),3);
for j = 1:length(stop_trigger_final)
beta_stop(j) = stimuli(3,round(stop_trigger_final(j)));
if stop_phase(j) == 1 %90deg
loc_phase = stimuli(3,[round(stop_trigger_final(j)-250):round(stop_trigger_final(j)+250)])==1;
loc_phase = find(loc_phase==1);
sample_loc_phase(j) = (round(stop_trigger_final(j)-[250-loc_phase]));
% 2 = zero coming from positive going into negative
elseif stop_phase(j) == 2 %180deg
data = stimuli(3,[round(stop_trigger_final(j)-250):round(stop_trigger_final(j)+250)]);
zerocross = find(diff(sign(data)));
if length(zerocross)>1
for z = 1:length(zerocross)
if data(zerocross(z)+1) < 0
sample_loc_phase(j) = (round(stop_trigger_final(j)-[250-zerocross(z)]));
end
end
else sample_loc_phase(j) = (round(stop_trigger_final(j)-[250-zerocross]));
end
elseif stop_phase(j) == 3 %270deg
loc_phase = stimuli(3,[round(stop_trigger_final(j)-250):round(stop_trigger_final(j)+250)])==-1;
loc_phase = find(loc_phase==1);
sample_loc_phase(j) = (round(stop_trigger_final(j)-[250-loc_phase]));
% 4 = zero coming from negative going into positive
elseif stop_phase(j) == 4 %360deg
data = stimuli(3,[round(stop_trigger_final(j)-250):round(stop_trigger_final(j)+250)]);
zerocross = find(diff(sign(data)));
if length(zerocross)>1
for z = 1:length(zerocross)
if data(zerocross(z)+1) > 0
sample_loc_phase(j) = (round(stop_trigger_final(j)-[250-zerocross(z)]));
end
end
else sample_loc_phase(j) = (round(stop_trigger_final(j)-[250-zerocross]));
end
else sample_loc_phase(j) = 0;
end
end
for j = 1:length(sample_loc_phase)
stimuli(5,round(sample_loc_phase(j)-5):round(sample_loc_phase(j)+5)) = 32;
end
save([saveloc 'stop_phase_2_4_' subject], 'stimuli');
%plotting
for j = 1:length(sample_loc_phase)
figure
plot(t(sample_loc_phase(j)-8000:sample_loc_phase(j)+1000), stimuli(3,sample_loc_phase(j)-8000:sample_loc_phase(j)+1000))
hold on
plot(t(sample_loc_phase(j)-8000:sample_loc_phase(j)+1000), stimuli(5,sample_loc_phase(j)-8000:sample_loc_phase(j)+1000)/10)
end
  1 Comment
Geoff Hayes
Geoff Hayes on 8 Oct 2021
@Muhammad - in your code, you have
if stop_phase(j) == 1 %90deg
% ...
% 2 = zero coming from positive going into negative
elseif stop_phase(j) == 2 %180deg
% ...
elseif stop_phase(j) == 3 %270deg
% ...
% 4 = zero coming from negative going into positive
elseif stop_phase(j) == 4 %360deg
If 1, 2, 3 and 4 correspond to 90, 180, 270, and 360 degrees, then what should correspond to 45,115,225,315?

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