How do I change my scalars to fit my normpdf?

Question

Leyton 2024-9-9，20:50

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https://ww2.mathworks.cn/matlabcentral/answers/2151419-how-do-i-change-my-scalars-to-fit-my-normpdf

编辑： Torsten 2024-9-9，21:36

Here's my code (I am not using the normpdf function because the problem specifically asks to write out the whole equation to get the answer)

e = 2.7183;
xq = 0:100; 
mu = [25, 50];
sigma = [5, 10];
figure(3)
for ii2 = 1:length(xq)
    ndist=(1/(sigma*sqrt(2*pi)))*power(e,-(1/2)*(power(xq-mu)/sigma),2)
    subplot (2,1,ii2)
    bar(ndist)
end

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Torsten 2024-9-9，20:56

Please explain what you are trying to do. I can't deduce it from your errorneous code.

Leyton 2024-9-9，21:00

I am trying to plot 2 normal distributions using the parameters above the for loop

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Answer 1

Torsten 2024-9-9，21:15

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2151419-how-do-i-change-my-scalars-to-fit-my-normpdf#answer_1513499

编辑：Torsten 2024-9-9，21:16

在 MATLAB Online 中打开

xq = 0:100;

mu = [25, 50].';

sigma = [5, 10].';

ndist = 1./(sigma*sqrt(2*pi)).*exp(-((xq-mu)./sigma).^2);

plot(xq,ndist)

grid on

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Leyton 2024-9-9，21:20

Thank you so much! This is much cleaner than what I typed for sure

Torsten 2024-9-9，21:33

编辑：Torsten 2024-9-9，21:36

在 MATLAB Online 中打开

Note that "mu" and "sigma" are column vectors and "xq" is a row vector.

Thus "pdist" will come out as a matrix:

xq = [1 2 3];
mu = [3 4].';
sigma = [2 9].';
(xq - mu)./sigma
ans = 2x3
   -1.0000   -0.5000         0
   -0.3333   -0.2222   -0.1111
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