Histogram using MAX not frequency values within a Bin?

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Tyson Haniotis
Tyson Haniotis 2017-9-9
编辑： Tyson Haniotis 2017-9-27
Hi, I can't seem to find anywhere how to make a histogram using the max values within a binwidth (like a bar graph) instead everything on the internet appears to show frequency histogram.
Thanks,
Regards, Tyson.
  1 个评论
Stephen23
Stephen23 2017-9-9
编辑：Stephen23 2017-9-9
"Histogram using MAX not frequency values within a Bin?"
The reason why you will not find anything on the internet is because what you are searching for makes no sense: a histogram is by definition a bar graph of the frequencies, so searching for a histogram using max is going to find you as many results as searching for a monotonically increasing sinewave or a circle with five corners.
Histogram, noun:
a graph of a frequency distribution in which rectangles with bases on the horizontal axis are given widths equal to the class intervals and heights equal to the corresponding frequencies.
a representation of a frequency distribution by means of rectangles whose widths represent class intervals and whose areas are proportional to the corresponding frequencies
a statistical graph that represents the frequency of values of a quantity by vertical rectangles of varying heights
Are you really asking about how to create a bar chart with binned data?

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Stephen23
Stephen23 2017-9-9
编辑：Stephen23 2017-9-9
One way would be to assign the values to groups using bsxfun and then use accumarray to get the maximum of each group:
>> x = [-5,-4,-3,-2,-1,0,1,2,3,4,5,6];
>> y = [ 6, 5, 4, 3, 1,1,1,3,4,5,6,7];
>> bw = 2;
>> bx = x(1):bw:x(end)+bw;
>> cn = sum(bsxfun(@le,bx(:),x),1);
>> mx = accumarray(cn(:),y(:),[],@max)
mx =
6
4
1
3
5
7
>> bar(mx)
giving:

更多回答（1 个）

Image Analyst
Image Analyst 2017-9-9
Are you looking for the bar() function instead of histogram()?

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