Create new variable with only values of a certain variable

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Mary Hemler
Mary Hemler 2020-6-1
编辑： Tommy 2020-6-1
I want to save a new variable 'highMI_sec' as only the values of mutualInfoTotal that are at least equal to 5 (at end of code). How can I do this?
for i = 1:n_cells
spikes = cellspikes{i}; % access cellspikes
spikes = spikes./1000; % ms to secs
spikes = spikes(spikes>startTime&spikes<stopTime);
edgesT = linspace(startTime,stopTime,numel(trackingtimes)+1);
binnedSpikes = histcounts(spikes,edgesT);% sorts spikes into bins
% also bin headangle data
n_bins_angle = 60;
edgesHD = linspace(min(headangle), max(headangle), n_bins_angle +1);
[occupancy,~,angle_inds] = histcounts(headangle,edgesHD);
for iBin = 1:n_bins_angle
spikesPerAngle(iBin) = sum(binnedSpikes(angle_inds == iBin));
end
SPA(1,i)={spikesPerAngle};
% compute average firing rate for each HD angle
firing_rate = spikesPerAngle./(occupancy.*deltaT); %this vector is a TUNING CURVE!
FR(1,i) = {firing_rate};
% now compute individual pieces needed to compute mutual info
probability_density = occupancy./sum(occupancy); %proportion of time spent at each HD angle per total occupancy at all angles
PD(1,i)={probability_density};
% compute average firing rate across all HD angles
mean_rate = numel(spikes)./(stopTime-startTime);
MR(1,i) = mean_rate;
% compute mutual info between firing rate and HD
mutualInfo = sum(firing_rate .* log2(firing_rate./mean_rate) .* probability_density,'omitnan');
MIperspike = mutualInfo./(mean_rate);
%store mutual info for each cell into a matrix
mutualInfoTotal(1,i) = mutualInfo; %in bits per second
MISpikeTotal(1,i) = MIperspike;
end

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采纳的回答

Tommy
Tommy 2020-6-1
Try this:
idx = mutualInfoTotal >= 5; % indices of values at least equal to 5
mutualInfoTotal = mutualInfoTotal(idx);
  2 个评论
Mary Hemler
Mary Hemler 2020-6-1
Okay, that worked, thanks. but the first statement didn't actually give me the indices of the values at least equal to 5 (it gave me a logical array). How can I find out the indices of the values at least equal to 5? I am trying to use that for my next step.
Tommy
Tommy 2020-6-1
编辑：Tommy 2020-6-1
Happy to help!
True, that was poor wording on my part. You could use
idx = find(mutualInfoTotal >= 5);

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