Why won't my function display any of the required text?

Question

Thomas Brown 2024-3-12

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评论： Thomas Brown 2024-3-12

The function / script runs completely fine except for the fact that it won't print any of the disp(....) text form inside the function. If I remove the function start and end block and rerun it as a normal script it runs the entire thing perfectly and outputs everything I need it to.

Any ideas what I have done wrong?

function FinalGrade

FinalGrade = FinalMark;

PartBAvg = (sum(Results{1:6,7})/6);

PartCAvg = (sum(Results{7:18,7})/12);

FinalMark = ((PartBAvg*0.33)+(PartCAvg*0.66))

if (FinalMark >= 0) && (FinalMark <= 100)

disp ('Check Complete, all Results are within reasonable parameters')

else

disp ('Error in calculation. Check Data source')

end

if (FinalMark >= 70)

disp ('First Class Degree')

elseif (60 <= FinalMark) && (FinalMark < 70)

disp ('Upper Second Class Degree')

elseif (50 <= FinalMark) && (FinalMark < 60)

disp ('Lower Second Class Degree')

elseif (40<= FinalMark) && (FinalMark < 50)

disp ('Third Class Degree')

else

disp ('Fail')

end

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Answer 1

VBBV 2024-3-12

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https://ww2.mathworks.cn/matlabcentral/answers/2093456-why-won-t-my-function-display-any-of-the-required-text#answer_1424141

在 MATLAB Online 中打开

%FinalGrade = FinalMark;

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Thomas Brown 2024-3-12

That didn't seem to work either. I will include below the entire script and not just the function. This may help slightly understand the problem.

The results tabloe, Module Mark and Word Check all return values in the command window. Nothing inside the function does. If the 'Check complete, all results are within....') if statement is placed prior to the function then it will display the correct statement. Inside the function it displays nothing.

Results = readtable("JansData.xlsx");

Results = renamevars (Results, "Var1", "Module");

Results = renamevars (Results, "Var2", "CW_Mark");

Results = renamevars (Results, "Var3", "CW_Weight");

Results = renamevars (Results, "Var4", "Exam_Mark");

Results = renamevars (Results, "Var5", "Exam_Weight");

Results = renamevars (Results, "Var6", "Credits");

Results.FinalMark = (Results.CW_Mark.*(Results.CW_Weight/100) ...

+Results.Exam_Mark.*(Results.Exam_Weight/100))

WordCheck = find(strcmp(Results.CW_Weight,'NaN'))

if WordCheck ~= 0

disp ('Words Found within Dataset')

else

disp('No Words discovered')

end

ModuleMark = Results{5,7}

PartBAvg = (sum(Results{1:6,7})/6);

PartCAvg = (sum(Results{7:18,7})/12);

if PartBAvg == 'NaN'

disp ('Error, text discovered in Datasets')

elseif PartCAvg == 'NaN'

disp ('Error, text discovered in Datasets')

else

end

function FinalGrade

% FinalGrade = FinalMark;

PartBAvg = (sum(Results{1:6,7})/6);

PartCAvg = (sum(Results{7:18,7})/12);

FinalMark = ((PartBAvg*0.33)+(PartCAvg*0.66))

if (FinalMark >= 0) && (FinalMark <= 100)

disp ('Check Complete, all Results are within reasonable parameters')

else

disp ('Error in calculation. Check Data source')

end

if (FinalMark >= 70)

disp ('First Class Degree')

elseif (60 <= FinalMark) && (FinalMark < 70)

disp ('Upper Second Class Degree')

elseif (50 <= FinalMark) && (FinalMark < 60)

disp ('Lower Second Class Degree')

elseif (40<= FinalMark) && (FinalMark < 50)

disp ('Third Class Degree')

else

disp ('Fail')

end

VBBV 2024-3-12

编辑：VBBV 2024-3-12

在 MATLAB Online 中打开

@Thomas Brown, thats because you are not passing any input to the function FinaGrade. See the below format of the function.

function FinalMark = FinalGrade(Results)
                              % <-----> input variable data
end

Also note i have used Results as numeric array whereas you have cell arrays since you import data using readtable. So change the ( ) to { } for Results inside the function

Thomas Brown 2024-3-12

That has now worked. Thank you for all your help

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