plotting of mean function of exponential random variables

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Mahabba Almheiri
Mahabba Almheiri 2020-5-3
评论： Mahabba Almheiri 2020-5-7
I faced difficulties in implemntation the mean value
I want to get value less than or equal 1 in y-axis because its represents the probability while at the same time I need the mean to be 175 in x-axis
when I use hist command I got the correct y-axis values while x-axis is wrong
but when I use histogram command instead of hist I got the mean which is in x-axis correct while y-axis values exceed the 1.
so what command should I use ?
x=exprnd(175,50,500)
figure (1)
histogram(x)
figure (2)
x_bar=mean(x)
pdfx_bar= hist(x_bar,100)/500
stairs(pdfx_bar)

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回答（1 个）

Tommy
Tommy 2020-5-3
编辑：Tommy 2020-5-3
The plot created by histogram has count on the y axis by default. If you would like the y axis to instead give probability, you can specify the 'Normalization' property to 'probability' for bar heights adding to 1:
x=exprnd(175,50,500);
histogram(x, 'normalization', 'probability')
or to 'pdf' for bar areas adding to 1:
x=exprnd(175,50,500);
histogram(x, 'normalization', 'pdf')

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