如何在Matlab中通过曲线连接直方图的选取点？

Question

I am beginner in Matlab. I have a histogram of a set of data I need to do 2 things. 1) I need the vertical axes to be normalized. 2) To curve a fit that passes through all the pick points of my Histogram bars.

Thank you

Answer 1

You can do it along these lines:

data = randn(1,1000); %// example data
num_bars = 15; %// specify number of bars

[n x] = hist(data,num_bars); %// use two-output version of hist to get values
n_normalized = n/numel(data)/(x(2)-x(1)); %// normalize to unit area
bar(x, n_normalized, 1); %// plot histogram (with unit-width bars)
hold on
plot(x, n_normalized, 'r'); %// plot line, in red (or change color)

Answer 2

For (1) try axis([xmin xmax ymin ymax])

For (2) try first drawing the histogram, then call hold on , then use the plot command.