How to plot Left - Rigth - Mid riemman sum of this code?

Question

David Araujo 2020-10-20

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/620518-how-to-plot-left-rigth-mid-riemman-sum-of-this-code

回答： Monisha Nalluru 2020-10-30

I have this code, its for the left riemman sum

how can i plot this?

x1 = 1;
x2 = 4;
f=@(x)x;
n=500;
dx=(x2-x1)/n;
leftSum=0.0;
for i=1:n
  leftSum=leftSum+f(x1+dx*(i-1));
  
end
leftSum=leftSum*dx;
x = linspace(0,11);
y = linspace(0,11);
xa = linspace(0,10,11);
z=integral(f,x1,x2);

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Answer 1

Monisha Nalluru 2020-10-30

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/620518-how-to-plot-left-rigth-mid-riemman-sum-of-this-code#answer_528799

在 MATLAB Online 中打开

You can use bar and plot function and achieve the required output

As an example

lowerlimit = 1;
upperlimit = 4;
bins = 10;
x = linspace(lowerlimit,upperlimit); % points for function
y = x;
xa = linspace(lowerlimit,upperlimit,bins); % for bar plot points 
ya = xa;
bar(xa,ya,'histc')
hold on
plot(x,y);
hold off