HIST function with negative center and single event.

Question

Yonghe 2011-5-5

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/6898-hist-function-with-negative-center-and-single-event

Dear all,

My program runs into issue with 'hist' when certain criteria meet. Following is the code:

tr_min_center = floor(min(spike_times)/bin_size)*bin_size + (.5*bin_size);
tr_max_center = ceil(max(spike_times)/bin_size)*bin_size - (.5*bin_size);
tr_centers = tr_min_center:bin_size:tr_max_center;
[tr_n, tr_xout] = hist(spike_times, tr_centers);

When there is only one event in spike_time with a negative number (relate to a synchronization time point), so there is only one negative center, function 'hist' give out error like: Attempted to access xx(0); index must be a positive integer or logical.

I track it down in 'hist' at code line 67 to 75:

if length(x) == 1
           if miny == maxy,
            miny = miny - floor(x/2) - 0.5; 
            maxy = maxy + ceil(x/2) - 0.5;
           end
          binwidth = (maxy - miny) ./ x;
          xx = miny + binwidth*(0:x);  -- This is the line error occurred since x is a negative number.