Why do I get "Undefined function or variable" error?

Question

Aaron Woods 2021-9-1

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https://ww2.mathworks.cn/matlabcentral/answers/1444789-why-do-i-get-undefined-function-or-variable-error

评论： darova 2021-9-1

% Load in Data
yndata = load('exampledata1.txt');
 
g1 = yndata(:,1); % Known Group
g2 = yndata(:,2); % Predicted Group
C = confusionmat(g1,g2); % Return the confusion matrix.
 
% For Sensitivity
ND = sum(C(:,1)); % Number of disease cases
DD = C(1,1); % Number of cases clasified as positive that are true
 
% For Specificity
NP = sum(C(:,2)); % Number of healthy cases
PP = C(2,1); % Number of cases classifed as negative that are true
 
ROCpoint(yndata)
 
function [Sensitivity, Specificity] = ROCpoint(yndata)
% Gets Sensitivity
Sensitivity = DD / ND; 
Specificity = PP / NP; % Gets Specificity
end
 
 

My error message is

Unrecognized function or variable 'DD'.
Error in HW2>ROCpoint (line 23)
Sensitivity = DD / ND;
Error in HW2 (line 19)
ROCpoint(yndata)     

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Answer 1

darova 2021-9-1

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I think your main code should be inside function body

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Answer 2

Image Analyst 2021-9-1

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https://ww2.mathworks.cn/matlabcentral/answers/1444789-why-do-i-get-undefined-function-or-variable-error#answer_778839

在 MATLAB Online 中打开

You need to pass them in

ROCpoint(DD, ND, PP, NP) % Call, passing in variables.
 
% Declare function with all needed variables.
function [Sensitivity, Specificity] = ROCpoint(DD, ND, PP, NP)