getting an error in this code

Question

Bobby 2022-4-29

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1708285-getting-an-error-in-this-code

回答： Mathieu NOE 2022-4-29

clc
clear 
%shipcostpmf.m
sx = (1:8);
px = [0.15*ones(4,1), 0.1*ones(4,1)];
gx = (sx<=5).*(105*sx-5*(sx.^2)) + ((sx>5).*500);
sy = unique(gx);
fprintf('sy =\n');
disp(sy);
py = finitepmf(gx,px,sy);

not sure why my py is getting an error because it says Unrecognized function or variable 'finitepmf'. but finitepmf should be a command?

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Answer 1

Mahmoud Ashraf 2022-4-29

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https://ww2.mathworks.cn/matlabcentral/answers/1708285-getting-an-error-in-this-code#answer_953895

在 MATLAB Online 中打开

you should define funstion of finitrepmf

as shown in this code

clc
clear 
%shipcostpmf.m
sx = (1:8);
px = [0.15*ones(4,1), 0.1*ones(4,1)];
gx = (sx<=5).*(105*sx-5*(sx.^2)) + ((sx>5).*500);
sy = unique(gx);
fprintf('sy =\n');
disp(sy);
py = finitepmf(gx,px,sy);
function pmf=finitepmf(sx,px,x) 
% finite random variable X: 
% vector sx of sample space 
% elements {sx(1),sx(2), ...} 
% vector px of probabilities 
% px(i)=P[X=sx(i)] 
% Output is the vector 
% pmf: pmf(i)=P[X=x(i)] 
    pmf=zeros(size(x(:))); 
    for i=1:length(x) 
        pmf(i)= sum(px(find(sx==x(i)))); 
    end
end

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Answer 2

Voss 2022-4-29

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1708285-getting-an-error-in-this-code#answer_953900

在 MATLAB Online 中打开

Maybe finitepmf should be defined as follows:

function pmf=finitepmf(sx,px,x) 
% finite random variable X: 
% vector sx of sample space 
% elements {sx(1),sx(2), ...} 
% vector px of probabilities 
% px(i)=P[X=sx(i)] 
% Output is the vector 
% pmf: pmf(i)=P[X=x(i)] 
    pmf=zeros(size(x(:))); 
    for i=1:length(x) 
        pmf(i)= sum(px(find(sx==x(i)))); 
    end
end

which was found here:

https://www.mathworks.com/matlabcentral/answers/627263-how-to-find-probability-mass-function

If that seems right and you haven't done so already, put that code into an m-file called finitepmf.m. If you have done that already, then make sure that finitepmf.m is on your MATLAB search path.

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Answer 3

Mathieu NOE 2022-4-29

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1708285-getting-an-error-in-this-code#answer_953930

在 MATLAB Online 中打开

hi

here you are

sx = (1:8);
px = [0.15*ones(4,1), 0.1*ones(4,1)];
gx = (sx<=5).*(105*sx-5*(sx.^2)) + ((sx>5).*500);
sy = unique(gx);
fprintf('sy =\n');
disp(sy);
py = finitepmf(gx,px,sy)
function pmf=finitepmf(sx,px,x) 
% finite random variable X: 
% vector sx of sample space 
% elements {sx(1),sx(2), ...} 
% vector px of probabilities 
% px(i)=P[X=sx(i)] 
% Output is the vector 
% pmf: pmf(i)=P[X=x(i)] 
    pmf=zeros(size(x(:))); 
    for i=1:length(x) 
        pmf(i)= sum(px(sx==x(i))); 
    end
end