Fit a distribution line in a histogram - Help!

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ka chun yick 2020-3-3

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https://ww2.mathworks.cn/matlabcentral/answers/508730-fit-a-distribution-line-in-a-histogram-help

评论： ka chun yick 2020-3-4

Hi all,

This is my code and the result i got. Somthing is not right, i used histfit(cntH,NumBins,'kernel'), i was expecting the distribution line is starting from zero and fit into the bars......How can i fix that?

clear all
clc
% yG = total 
load yH
% specify number of bins and edges of those bins; this example evenly spaces bins
NumBins = 100;
BinEdges = linspace(0,35,70);
% use histcounts and specify your bins
cntH = histcounts(yH,'BinEdges',BinEdges);
% plot
figure(1); cla; hold on;
% convert bin edges into bin centers
b = BinEdges(1:end-1)+diff(BinEdges)/2
% use bar
bar(b,[cntH'],'stacked')
histfit(cntH,NumBins,'kernel');
% Labels   
xlabel('Length of single walled carbon nanotubes (mm)')
ylabel('Count of CNT(log scale)')
set(gca,'YScale','log')
title('Count of CNT against length of SWCNTs in 0 degree(log scale)')

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J. Alex Lee 2020-3-3

在 MATLAB Online 中打开

You need to be more specific. Presumably you want to do something with the parameters of the underlying fitted distribution.

If you just want to draw a line, you can get the bin edges and counts from the histcounts function, find the bin centers, and use the plot command on that pair.

plot(b,cntH','-')

ka chun yick 2020-3-4